openssl vuln: A Long History of Vulnerabilities

OpenSSL vuln has a long and complex history, with vulnerabilities dating back to the early 2000s. One of the first major vulnerabilities was discovered in 2002, and it allowed an attacker to conduct a man-in-the-middle attack on SSL connections.

The vulnerability was fixed, but it was just the beginning. Since then, there have been numerous other vulnerabilities discovered in OpenSSL, with some of the most significant ones being the Heartbleed bug in 2014 and the Logjam attack in 2015.

These vulnerabilities have led to significant security breaches and data losses, and have highlighted the importance of keeping OpenSSL up to date. In fact, the Heartbleed bug was so severe that it was estimated to have affected over 600,000 websites.

The frequency and severity of OpenSSL vulnerabilities have led many to question the security of the internet, and have sparked calls for greater security measures to be implemented.

For more insights, see: Openssl Heartbleed

There were three notable vulnerabilities in OpenSSL in 2017, each with its own unique characteristics.

CVE-2017-3735 was a one-byte overread bug that could result in an incorrect text display of an X.509 certificate while parsing an IPAdressFamily extension.

This vulnerability was particularly problematic because it allowed an attacker to manipulate the display of the certificate, potentially leading to confusion or mistrust among users.

CVE-2017-3733 was a renegotiation handshake bug that could cause OpenSSL to crash if the Encrypt-Then-Mac extension was negotiated during a handshake.

This bug was especially concerning because it could affect both clients and servers, and was dependent on the ciphersuite being used.

CVE-2017-3732 was a carry propagating bug in the x86_64 Montgomery squaring procedure that was particularly difficult to exploit.

However, it was still possible to launch a successful attack against DH algorithms, although it would require a significant amount of resources and online access to an unpatched system.

Recommended read: Openssl Heartbleed Bug

CVE-2017-3737 was a serious vulnerability in OpenSSL 1.0.2, starting from version 1.0.2b. This vulnerability introduced an "error state" mechanism that didn't work correctly if SSL_read() or SSL_write() was called directly after a fatal error occurred.

The bug in OpenSSL 1.0.2 caused a fatal error to be returned in the initial function call, but subsequent calls to SSL_read() or SSL_write() for the same SSL object would succeed and pass data without being decrypted or encrypted.

To exploit this issue, an application bug was required that resulted in a call to SSL_read() or SSL_write() being issued after having already received a fatal error.

This vulnerability was not as straightforward to exploit as it sounds, as an application bug was necessary to trigger it.

CVE-2017-3738 is an overflow bug in the AVX2 Montgomery multiplication procedure used in exponentiation with 1024-bit moduli. This bug was identified in OpenSSL 1.0.2 before 1.0.2n and OpenSSL 1.1.0 before 1.1.0h.

The bug affects processors that support AVX2 but not ADX extensions, such as Intel Haswell (4th generation). This means that if you're running OpenSSL on one of these processors, you may be vulnerable to this bug.

Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. However, attacks against DH1024 are considered just feasible, especially if the server shares the DH1024 private key among multiple clients.

To put this into perspective, the impact from this issue is similar to other vulnerabilities like CVE-2017-3736, CVE-2017-3732, and CVE-2015-3193. Due to the low severity of this issue, a new release of OpenSSL 1.1.0 is not being issued at this time.

CVE-2017-3735 is a vulnerability that allows for a one-byte overread while parsing an IPAdressFamily extension in an X.509 certificate. This overread results in an incorrect text display of the certificate.

The impact of this vulnerability is significant, as it can lead to security issues and potentially allow an attacker to manipulate the certificate's text display.

CVE-2017-3733 is a vulnerability that can cause OpenSSL to crash. This can happen during a renegotiation handshake if the Encrypt-Then-Mac extension is negotiated where it was not in the original handshake.

The CVE Record and OpenSSL Advisory are available for reference. The vulnerability affects both clients and servers.

A specific version of OpenSSL, 1.1.0e, is affected. This is indicated by the git commit listed in the CVE Record.

CVE-2017-3732 is a carry propagating bug in the x86_64 Montgomery squaring procedure.

This bug affects the Montgomery squaring procedure, but no EC algorithms are affected.

Analysis suggests that attacks against RSA and DSA are very difficult to perform and are not believed likely.

Attacks against DH are considered just feasible, although very difficult, because most of the work necessary to deduce information about a private key can be performed offline.

An attacker would need online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key shared between multiple clients.

This issue is very similar to CVE-2015-3193 but must be treated as a separate problem.

Here are some related resources:

CVE-2016-6304 is a vulnerability that affects OpenSSL versions from 1.0.1 before 1.0.1u, 1.0.2 before 1.0.2i, and 1.1.0 before 1.1.0a. A malicious client can send an excessively large OCSP Status Request extension, leading to a Denial Of Service attack through memory exhaustion.

Servers with a default configuration are vulnerable, even if they don't support OCSP. Builds using the “no-ocsp” build time option are not affected. Servers using OpenSSL versions prior to 1.0.1g are not vulnerable in a default configuration, but only if an application explicitly enables OCSP stapling support.

The vulnerability is caused by a flaw in the logic of version 1.1.0, which results in excessive memory allocation. This can lead to a Denial of Service through memory exhaustion, but the attack is transitory in nature, as the memory is freed again in the SSL_free() call. However, there is an increased risk of application crashes due to lack of memory during this period.

Some of the affected versions of OpenSSL include 1.0.1 before 1.0.1t, 1.0.2 before 1.0.2h, and 1.1.0 before 1.1.0a. These versions are vulnerable to various attacks, including denial of service and arbitrary code execution.

Here's a list of the affected versions:

A second vulnerability, CVE-2016-2181, affects DTLS connections and allows an attacker to send a record for the next epoch, with a very large sequence number, causing a denial of service for a specific DTLS connection.

CVE-2016-7054 is a DoS attack that can crash OpenSSL by corrupting larger payloads in TLS connections using *-CHACHA20-POLY1305 ciphersuites. This issue is not considered exploitable beyond a DoS.

The attack can be triggered by sending a malformed payload, which can cause OpenSSL to crash. This is a significant vulnerability because it can be used to bring down a server or disrupt service.

To mitigate this issue, users should update their OpenSSL packages to the latest version. Additionally, organizations can use the Wiz Threat Center for a prioritized list of impacted assets, which can help focus remediation efforts on the workloads that face the greatest risk.

Here are some key facts about CVE-2016-7054:

CVE-2016-6304 is a vulnerability that can lead to a Denial Of Service attack through memory exhaustion. This attack occurs when a malicious client sends an excessively large OCSP Status Request extension.

Servers with a default configuration are vulnerable, even if they don't support OCSP. This means that if you're running a server without explicitly disabling OCSP, you're at risk.

Builds using the "no-ocsp" build time option are not affected by this vulnerability. This is a good option to consider if you're looking to mitigate the risk.

Servers using OpenSSL versions prior to 1.0.1g are not vulnerable in a default configuration. However, if an application explicitly enables OCSP stapling support, the server is vulnerable.

Here are the specific versions of OpenSSL that are affected:

These versions of OpenSSL contain the vulnerable code, and you should update to the fixed versions to avoid the risk of a Denial Of Service attack.

CVE-2016-6305 is a vulnerability in OpenSSL 1.1.0 that can be exploited in a Denial Of Service attack.

This vulnerability occurs when a malicious peer sends an empty record to the server, causing OpenSSL 1.1.0 SSL/TLS to hang during a call to SSL_peek().

The issue affects OpenSSL 1.1.0 SSL/TLS, and is present in versions from 1.0.1 before 1.0.1u and from 1.0.2 before 1.0.2i.

Here's a breakdown of the affected versions:

This vulnerability is significant because it can be exploited by a malicious peer, and it's essential to be aware of the affected versions to take necessary precautions.

A flaw in the logic of OpenSSL version 1.1.0 means that memory for a DTLS message is allocated too early, prior to the excessive message length check. This could lead to a Denial of Service through memory exhaustion.

The excessive message length check still takes place, and this would cause the connection to immediately fail, freeing up the 21Mb of allocated memory. However, this only happens if the application calls SSL_free() in a timely manner after the connection fails.

The security impact of this vulnerability is only significant if the application does not call SSL_free() in a timely manner, or if the application is working in a constrained environment where there is very little free memory.

Wiz detects impacted OpenSSL packages on all cloud workloads, including VMs, containers, serverless functions, and even virtual appliances.

Customers can use the Wiz Security Graph to focus remediation efforts on the workloads that face the greatest risk, such as those exposed to the internet or with access to sensitive resources.

To identify impacted assets, you should use the Wiz Threat Center for a prioritized list of impacted assets.

This list will help you quickly identify which assets are at risk and prioritize your remediation efforts accordingly.

The Wiz Security Graph will also help you visualize the risk landscape and make informed decisions about where to focus your efforts.

OpenSSL versions 3.0.0 and higher are vulnerable to CVE-2022-3786 and CVE-2022-3602.

Some Internet servers, like Apache, can give us insight into what specific versions of OpenSSL are being used through the "Server" header. This header can include information about loaded modules, such as the version of OpenSSL that the mod_ssl module was compiled against.

A few servers on the Internet advertise versions of OpenSSL that do not exist in the real world. For example, some hosts claim to be running OpenSSL version 3.2.0-dev, which does not exist.

Below is a table that includes every version of OpenSSL that we could identify that is greater than or equal to version 3.0.0 and the top twenty countries with those versions installed.

The top 20 countries with OpenSSL versions greater than or equal to 3.0.0 installed are the United States, Germany, Japan, China, Czechia, United Kingdom, France, Russia, Canada, Netherlands, Italy, Poland, Australia, Singapore, India, Finland, Hong Kong, Brazil, Taiwan, and others.

To identify vulnerable versions of OpenSSL, you can run the command "openssl version" to see the version installed on your operating system.

You might enjoy: Openssl Latest Version

CVE-2016 vulnerabilities continued to plague OpenSSL in 2016. The year saw several critical vulnerabilities, including CVE-2016-2107, which allowed for a denial-of-service attack.

The vulnerability, discovered in June 2016, was caused by a flaw in the DTLS implementation. This allowed an attacker to crash the server by sending a carefully crafted DTLS packet.

The OpenSSL team quickly released a patch to address the issue, and users were advised to update their OpenSSL installations as soon as possible.

CVE-2016-7053 is a vulnerability that affects applications that parse invalid CMS structures. A bug in the handling of the ASN.1 CHOICE type in OpenSSL 1.1.0 can result in a NULL value being passed to the structure callback.

This bug is caused by a flaw in the handling of the ASN.1 CHOICE type, which can lead to a NULL pointer dereference.

Only CHOICE structures using a callback that does not handle NULL values are affected by this bug.

The bug is present in OpenSSL 1.1.0 and can be mitigated by updating to a newer version of OpenSSL.

Here are the specific details of the vulnerability:

By understanding this vulnerability, we can better protect our applications from potential crashes and security risks.

CVE-2016-2182 is a vulnerability that affects the OpenSSL library. It's a carry propagating bug in the Broadwell-specific Montgomery multiplication procedure that handles input lengths divisible by, but longer than 256 bits.

This bug can manifest itself as transient authentication and key negotiation failures or reproducible erroneous outcome of public-key operations with specially crafted input. Among EC algorithms only Brainpool P-512 curves are affected and one presumably can attack ECDH key negotiation.

The impact was not analyzed in detail, because pre-requisites for attack are considered unlikely. Namely multiple clients have to choose the curve in question and the server has to share the private key among them, neither of which is default behaviour.

To determine if you are affected by this vulnerability, you can check your OpenSSL version. The affected versions are 1.1.0 before 1.1.0c and 1.0.2 before 1.0.2k.

Here is a summary of the affected versions:

CVE-2016-2107 was a vulnerability that allowed a MITM attacker to decrypt traffic when a connection used an AES CBC cipher and the server supported AES-NI.

You might like: Openssl Aes

This issue was introduced as part of the fix for Lucky 13 padding attack (CVE-2013-0169). The padding check was rewritten to be in constant time by making sure that always the same bytes are read and compared against either the MAC or padding bytes.

A critical flaw in the padding check meant it no longer checked if there was enough data to have both the MAC and padding bytes.

Discover more: Openssl Check Connection

CVE-2015-3197 allowed a malicious client to negotiate SSLv2 ciphers, even if they were disabled on the server. This could lead to a security vulnerability.

In 2015, OpenSSL had several vulnerabilities, including CVE-2015-1789, which affected X509_cmp_time. This allowed an attacker to craft malformed certificates and CRLs, potentially causing a segmentation fault and a DoS attack.

CVE-2015-0291 was a ClientHello sigalgs DoS vulnerability, where a client could renegotiate with an invalid signature algorithms extension, causing a NULL pointer dereference and a potential DoS attack.

CVE-2015-3197 is a vulnerability that affects OpenSSL versions from 1.0.1 before 1.0.1r and from 1.0.2 before 1.0.2f. A malicious client can negotiate SSLv2 ciphers that have been disabled on the server and complete SSLv2 handshakes even if all SSLv2 ciphers have been disabled, provided that the SSLv2 protocol was not also disabled via SSL_OP_NO_SSLv2.

This vulnerability can be exploited if a client is configured to use SSLv2, even if the server is configured to disable it. The vulnerability can be mitigated by disabling SSLv2 on both the client and server.

Here are the affected versions of OpenSSL:

CVE-2015-3193 is a carry propagating bug in the x86_64 Montgomery squaring procedure. No EC algorithms are affected.

Analysis suggests that attacks against RSA and DSA would be very difficult to perform and are not believed likely. This is because the required resources for such an attack would be very significant and likely only accessible to a limited number of attackers.

Attacks against DH are considered just feasible (although very difficult) because most of the work necessary to deduce information about a private key may be performed offline. An attacker would need online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key shared between multiple clients.

This can occur by default in OpenSSL DHE based SSL/TLS ciphersuites. The affected versions include:

CVE-2015-1789 is a vulnerability that affects various versions of a software.

It was discovered in X509_cmp_time, a function that doesn't properly check the length of the ASN1_TIME string.

This can lead to a segmentation fault, resulting in a Denial of Service (DoS) on applications that verify certificates or CRLs.

The vulnerable versions include 1.0.2 before 1.0.2b, 1.0.1 before 1.0.1n, 1.0.0 before 1.0.0s, and 0.9.8 before 0.9.8zg.

Here are the affected versions:

TLS clients that verify CRLs are affected by this vulnerability.

Additionally, TLS clients and servers with client authentication enabled may be affected if they use custom verification callbacks.

These vulnerabilities can only be exploited if you're using mutual TLS (mTLS) and your server is configured to request client authentication.

In mTLS, the server authenticates the client's identity based on a certificate sent by the client, making you more vulnerable to attacks.

Exploiting these vulnerabilities requires a malicious client to send a specially-crafted certificate to your server, which is a specific and targeted attack.

Automated clients, like web-crawlers and bots, can also be made to connect to malicious servers, increasing the risk of exploitation.

Explore further: Openssl Server

CVE-2015-3194 is a serious vulnerability that can be exploited in a DoS attack.

This vulnerability affects applications that perform certificate verification, including OpenSSL clients and servers that enable client authentication.

The vulnerability occurs when the signature verification routines crash with a NULL pointer dereference, which can be triggered by an ASN.1 signature using the RSA PSS algorithm and absent mask generation function parameter.

The affected versions of the application are 1.0.2 before 1.0.2e and 1.0.1 before 1.0.1q.

To put this into perspective, any application that performs certificate verification is vulnerable, making it a widespread issue that requires attention.

Here are the affected versions of the application:

CVE-2015-3195 is a memory leak vulnerability in OpenSSL.

This vulnerability occurs when an application reads PKCS#7 or CMS data from untrusted sources, which is a common practice in many systems.

The X509_ATTRIBUTE structure is used by the PKCS#7 and CMS routines, making any application that uses these routines susceptible to the vulnerability.

The good news is that SSL/TLS is not affected by this vulnerability, so secure connections remain secure.

OpenSSL developers should be on the lookout for malformed X509_ATTRIBUTE structures to prevent memory leaks.

CVE-2015-1794 is a vulnerability that occurs when a client receives a ServerKeyExchange for an anonymous DH ciphersuite with the value of p set to 0.

This can lead to a seg fault and a possible denial of service attack.

The vulnerability is listed in the OpenSSL vulnerabilities section.

The OpenSSL 1.1.1 Series Release Notes and OpenSSL 3.0 Series Release Notes mention CVE-2015-1794.

A list of OpenSSL vulnerabilities can be found in the following sections:

CVE-2015-1788 is a critical vulnerability in OpenSSL that can cause a system to enter an infinite loop.

This happens when processing an ECParameters structure, specifically if the curve specified is over a specially malformed binary polynomial field.

OpenSSL systems that process public keys, certificate requests, or certificates are vulnerable to denial of service attacks.

This includes TLS clients and TLS servers with client authentication enabled, making them potential targets for hackers.

CVE-2015-1790 is a vulnerability that affects the PKCS#7 parsing code. The code doesn't handle missing inner EncryptedContent correctly.

An attacker can craft malformed ASN.1-encoded PKCS#7 blobs with missing content. This triggers a NULL pointer dereference on parsing.

Applications that decrypt PKCS#7 data or otherwise parse PKCS#7 structures from untrusted sources are affected by this vulnerability.

CVE-2015-0208 is a serious vulnerability that can cause a segmentation fault in certificate verification operations. This occurs when an ASN.1 signature using the RSA PSS algorithm is presented with invalid parameters.

The vulnerability is triggered by a NULL pointer dereference, which can be exploited in a Denial of Service (DoS) attack. Any application that performs certificate verification is potentially vulnerable.

OpenSSL clients and servers that enable client authentication are particularly at risk, as they rely on the signature verification routines. This can lead to a crash of the certificate verification operation.

CVE-2015-0293 was a serious vulnerability that allowed a malicious client to trigger an OPENSSL_assert in servers that supported SSLv2 and enabled export cipher suites.

A specially crafted SSLv2 CLIENT-MASTER-KEY message was all it took to exploit this vulnerability, making it a significant concern for server administrators.

This vulnerability was particularly problematic because it was triggered by a message that was intended to be legitimate, making it harder to detect and prevent.

Servers that were affected by this vulnerability were those that supported both SSLv2 and enabled export cipher suites, creating a perfect storm for attackers to exploit.

CVE-2015-0205 is a vulnerability that affects OpenSSL servers. It allows a client to authenticate without the use of a private key.

This vulnerability is extremely rare and only affects servers that trust a client certificate authority which issues certificates containing DH keys. These types of certificates are hardly ever encountered.

A server will accept a DH certificate for client authentication without the certificate verify message. This is because OpenSSL does not enforce a match between the signature algorithm between the signed and unsigned portions of the certificate.

The affected versions of OpenSSL are from 1.0.1 before 1.0.1k and from 1.0.0 before 1.0.0p.

Only custom applications that rely on the uniqueness of the fingerprint may be affected. This is because modifying the contents of the signature algorithm or the encoding of the signature does not allow an attacker to forge certificates.

This vulnerability does not affect certificate verification or OpenSSL servers/clients in any other way. It also does not affect common revocation mechanisms.

To be vulnerable to these TLS issues, you need to be using mutual TLS (mTLS), where the server authenticates the client's identity based on a certificate sent by the client.

This means regular TLS, where only the client authenticates the server's identity, is not affected.

The vulnerabilities can only be exploited if a server is configured to request client authentication and receives a specially-crafted certificate from a malicious client.

In other words, this is a specific setup that needs to be in place for the vulnerabilities to be exploitable.

If you're a server user, you need to be aware of the risks of having your server configured to request client authentication.

Automated clients, such as web-crawlers and bots that fetch social media previews, may also be made to connect to malicious servers.

If you're a client, you need to be cautious when connecting to servers, especially if you've been phished or your traffic is being redirected due to a man-in-the-middle (MITM) attack.

To exploit these vulnerabilities, a malicious client would need to send a specially-crafted certificate to a server configured for mutual TLS.

Servers using regular TLS, where only the client authenticates the server's identity, are not affected by these vulnerabilities.

A client can only be exploited if it connects to an attacker-controlled server, which might happen if a user is phished or if their traffic is being redirected due to a man-in-the-middle attack.

Automated clients, such as web-crawlers and bots that fetch social media previews, may also be made to connect to malicious servers.

CVE-2014-8176 was a vulnerability in OpenSSL that existed in previous versions and was fixed in June 2014. It caused an invalid free, resulting in a segmentation fault or memory corruption, when a DTLS peer received application data between the ChangeCipherSpec and Finished messages.

This vulnerability affected versions from 1.0.1 before 1.0.1h, 1.0.0 before 1.0.0m, and 0.9.8 before 0.9.8za. The other notable vulnerability from 2014 was CVE-2014-3571, which caused a segmentation fault in OpenSSL due to a NULL pointer dereference in a carefully crafted DTLS message.

Other vulnerabilities from 2014 included CVE-2014-3505, CVE-2014-3506, and CVE-2014-3511, which were all related to DTLS and caused Denial of Service attacks or allowed for a downgrade to TLS 1.0.

CVE-2014-8176 was a vulnerability that existed in previous versions of OpenSSL. It was fixed in June 2014, so current versions of OpenSSL are not affected.

The vulnerability caused a segmentation fault or potentially memory corruption when a DTLS peer received application data between the ChangeCipherSpec and Finished messages. This was due to buffering of such data causing an invalid free.

The affected versions of OpenSSL include 1.0.1 before 1.0.1h, 1.0.0 before 1.0.0m, and 0.9.8 before 0.9.8za.

Here's a list of the affected versions:

This vulnerability highlights the importance of keeping software up to date to prevent security issues.

CVE-2014-3570 is a bug that affects the Bignum squaring (BN_sqr) function in OpenSSL. This bug can produce incorrect results on some platforms, including x86_64, but only with a very low probability.

The probability of this bug occurring is extremely low, estimated to be 1/2^64 on the single affected 32-bit platform (MIPS) and 1/2^128 on affected 64-bit platforms.

On most platforms, RSA operations are not affected at all, as they follow a different code path. However, static ECDH is theoretically affected, although there is no known computationally feasible way to construct elliptic curve points that would falsely appear to be on the given curve.

Other routines known to be theoretically affected include modular exponentiation, primality testing, DSA, RSA blinding, JPAKE, and SRP, but no exploits are known and straightforward bug attacks fail.

Here's a breakdown of the affected platforms and routines:

CVE-2014-3571 is a serious vulnerability in OpenSSL that can cause a segmentation fault due to a NULL pointer dereference. This could lead to a Denial Of Service attack.

A carefully crafted DTLS message is all it takes to trigger this vulnerability. It's a reminder that even with the best security measures in place, a single misstep can have serious consequences.

The vulnerability affects OpenSSL versions that are not patched, and it's essential to keep your software up-to-date to avoid falling victim to this attack.

CVE-2014-0195 was a serious vulnerability that affected OpenSSL DTLS clients and servers.

This vulnerability allowed a buffer overrun attack to be triggered by sending invalid DTLS fragments.

The affected versions of OpenSSL were from 1.0.1 before 1.0.1h, from 1.0.0 before 1.0.0m, and from 0.9.8o before 0.9.8za.

Only applications using OpenSSL as a DTLS client or server were affected by this vulnerability.

This means that if you were using an affected version of OpenSSL, you were potentially vulnerable to running arbitrary code on your client or server.

CVE-2014-0221 is a vulnerability in OpenSSL that allows a malicious actor to crash an OpenSSL DTLS client with a specially crafted invalid DTLS handshake.

This issue only affects applications that use OpenSSL as a DTLS client, which means it's a problem for those specific use cases.

The vulnerability is present in OpenSSL versions 1.0.1 before 1.0.1h and 1.0.0 before 1.0.0m.

Here are the specific versions affected by this vulnerability:

CVE-2014-0224 was a vulnerability that allowed an attacker to force the use of weak keying material in OpenSSL SSL/TLS clients and servers. This made it possible for an attacker to decrypt and modify traffic from the client and server.

The vulnerable versions of OpenSSL were those from 1.0.1 before 1.0.1h and from 1.0.0 before 1.0.0m. This vulnerability was particularly concerning because it could be exploited by a Man-in-the-middle (MITM) attack.

To put this in perspective, imagine a situation where you're trying to have a private conversation with a friend, but someone is intercepting and modifying your messages. This is essentially what CVE-2014-0224 allowed an attacker to do.

The following versions of OpenSSL were affected by this vulnerability:

It's worth noting that this vulnerability was a serious issue that needed to be addressed promptly.

The Heartbleed bug, CVE-2014-0160, was a critical vulnerability in OpenSSL that allowed attackers to read sensitive data from memory. This bug was a major security concern and led to a widespread panic in the security community.

The vulnerability was caused by a missing bounds check in the OpenSSL library, which allowed an attacker to send a malformed message that would cause the library to leak memory. This bug was particularly concerning because it was difficult to detect and required no interaction from the user.

The Heartbleed bug was discovered by a team of researchers at Codenomicon, who were able to exploit the vulnerability to extract sensitive data from a test server.

CVE-2014-3569 is a vulnerability in OpenSSL that affects multiple versions of the library.

The vulnerability is found in OpenSSL versions 1.0.1j before 1.0.1k, 1.0.0o before 1.0.0p, and 0.9.8zc before 0.9.8zd.

These versions have a bug where the ssl method is set to NULL when a SSL v3 ClientHello is received, which can later result in a NULL pointer dereference.

This vulnerability can lead to a crash or other security issues if not addressed.

Here's a list of the affected versions:

CVE-2013-4353 was a serious vulnerability in OpenSSL that allowed a malicious server to crash a connecting client with a NULL pointer exception.

This flaw was triggered by a carefully crafted invalid TLS handshake.

It's worth noting that this issue only affected OpenSSL 1.0.1 versions.

The CVE-2010-2014 vulnerabilities are quite specific in their requirements for exploitation. These vulnerabilities can only be exploited if the server is configured to request client authentication and receive a specially-crafted certificate from a malicious client.

This means that only servers using mutual TLS (mTLS) are affected, as they also authenticate the client's identity based on a certificate sent by the client. Regular (non-mutual) TLS, where only the client authenticates the server's identity, is not vulnerable.

Automated clients like web-crawlers and bots that fetch social media previews may also be made to connect to malicious servers, making them vulnerable to these exploits.

CVE-2010-5298 is a vulnerability in the ssl3_read_bytes function of OpenSSL. It allows remote attackers to inject data across sessions or cause a denial of service.

This flaw only affects multithreaded applications using OpenSSL 1.0.0 and 1.0.1, where SSL_MODE_RELEASE_BUFFERS is enabled. This is not the default and not common.

The vulnerability is a result of a race condition, which can be exploited by remote attackers.

CVE-2010-4180 is a vulnerability in OpenSSL's SSL/TLS server code that allows malicious clients to modify the stored session cache ciphersuite. This can lead to a weaker ciphersuite being used on subsequent connections.

The vulnerability affects OpenSSL versions 1.0.0 before 1.0.0c and 0.9.8 before 0.9.8q. It also affects versions 0.9.8f before 0.9.8n if the SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG flag is enabled.

To be more specific, the vulnerable versions are:

It's worth noting that this issue only affects OpenSSL based SSL/TLS servers that use OpenSSL's internal caching mechanisms and the SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG flag.

CVE-2010-3864 is a vulnerability in the OpenSSL TLS server extension code parsing that can be exploited in a buffer overrun attack. This vulnerability affects servers that are multi-threaded and use OpenSSL's internal caching mechanism.

Affected versions of OpenSSL include 1.0.0 before 1.0.0b and 0.9.8 before 0.9.8p.

Servers that are multi-process and/or disable internal session caching are not affected by this vulnerability.

CVE-2012-2013 Vulnerabilities were discovered in the OpenSSL library, which is used for secure communication over the internet. These vulnerabilities can be exploited in various ways, including denial-of-service attacks.

A malicious TLS client can send an invalid set of GOST parameters to cause the server to crash, as seen in CVE-2012-0027. This can be used in a denial-of-service attack.

In addition, CVE-2013-0166 and CVE-2012-2333 can be exploited in denial-of-service attacks. CVE-2013-0166 is a flaw in the OpenSSL handling of OCSP response verification, while CVE-2012-2333 is an integer underflow flaw that can cause a buffer over-read.

CVE-2013-6449 was a flaw in OpenSSL that caused an application using OpenSSL to crash when using TLS version 1.2.

This issue only affected OpenSSL 1.0.1 versions, which means that if you were using an earlier version of OpenSSL, you were not affected by this vulnerability.

The good news is that this vulnerability was patched in later versions of OpenSSL, so if you're using a current version, you're good to go.

Here are the versions of OpenSSL that were affected by CVE-2013-6449:

CVE-2012-2686 is a vulnerability that affects OpenSSL's handling of CBC ciphersuites in TLS 1.1 and TLS 1.2 on AES-NI supporting platforms.

This flaw can be exploited in a DoS attack, which means an attacker could potentially crash the server or make it unavailable.

The vulnerability exists in OpenSSL versions 1.0.1 before 1.0.1d, 1.0.0 before 1.0.0k, and 0.9.8 before 0.9.8y.

On the other hand, the vulnerability does not exist in OpenSSL versions 0.9.8 before 0.9.8k.

Here's a list of affected and unaffected OpenSSL versions:

CVE-2013-0169 is a weakness in the handling of CBC ciphersuites in SSL, TLS and DTLS that could lead to plaintext recovery by exploiting timing differences arising during MAC processing.

This vulnerability was present in various versions of SSL and TLS protocols, including 1.0.1 before 1.0.1c, 1.0.0 before 1.0.0j, and 0.9.8 before 0.9.8x.

To be specific, the affected versions are:

These versions are particularly vulnerable to the timing differences that can lead to plaintext recovery.

CVE-2012-0027 is a vulnerability that affects the OpenSSL GOST ENGINE, allowing a malicious TLS client to crash the server by sending invalid GOST parameters.

This bug can be used in a denial-of-service attack, making it a serious security concern. Only users of the OpenSSL GOST ENGINE are affected.

The vulnerability is caused by a lack of error checking in the server code, which can lead to a crash if an invalid set of GOST parameters is received. This highlights the importance of robust error checking in cryptographic protocols.

Server-side applications that support ephemeral ECDH ciphersuites are also affected, but only if ephemeral ECDH ciphersuites are enabled in the configuration.

CVE-2012-0050 is a vulnerability that affects DTLS applications, making them susceptible to a denial of service attack.

The flaw in the fix to CVE-2011-4108 is the root cause of this issue. This vulnerability specifically affects versions 1.0.0f before 1.0.0g and 0.9.8s before 0.9.8t.

Only these specific versions are affected, so if you're using a different version, you're in the clear.

OpenSSL was susceptible to an extension of the Vaudenay padding oracle attack on CBC mode encryption, which enabled an efficient plaintext recovery attack against the OpenSSL implementation of DTLS by exploiting timing differences arising during decryption processing.

This attack, known as CVE-2011-4108, was a serious vulnerability that could have allowed hackers to recover plaintext data.

Applications that enabled OpenSSL's internal CRL checking were affected by the CRL checking vulnerability, CVE-2011-3207, which allowed incorrect acceptance of a CRL whose nextUpdate field was in the past.

Applications that used their own custom CRL checking, such as Apache, were not affected by this vulnerability.

CVE-2011-4108 was an extension of the Vaudenay padding oracle attack on CBC mode encryption. This attack enabled an efficient plaintext recovery against the OpenSSL implementation of DTLS.

OpenSSL was susceptible to this attack, which exploited timing differences arising during decryption processing. This vulnerability was a significant concern for users of OpenSSL.

The attack was an extension of the Vaudenay padding oracle attack, which is a well-known technique in cryptography. This attack was particularly effective against the OpenSSL implementation of DTLS.

As a result of this vulnerability, users of OpenSSL needed to be aware of the potential risks and take steps to mitigate them.

CVE-2011-4576 is a vulnerability in OpenSSL that failed to clear the bytes used as block cipher padding in SSL 3.0 records, which could leak the contents of memory in some circumstances.

This vulnerability is a classic example of a memory leak, where sensitive information is accidentally exposed due to a programming error. I've seen it happen in other contexts, where a developer might not properly clear memory after use, leading to security issues.

The vulnerability was discovered in OpenSSL, a widely used encryption library, and it's essential to update to a patched version to prevent exploitation.

Here are the details of the vulnerability:

This vulnerability was fixed in a subsequent version of OpenSSL, so it's crucial to keep your software up to date to avoid any potential issues.

CVE-2011-4577 was a vulnerability in OpenSSL that allowed for a denial-of-service attack.

This was due to a flaw in the way RFC 3779 data was handled in certificates. If the data was malformed, it could trigger an assertion failure.

Builds of OpenSSL were only vulnerable if they were configured with "enable-rfc3779", which was not the default setting.

A significant number of vulnerabilities were discovered in OpenSSL in 2010.

CVE-2010-0742 is a flaw in the handling of CMS structures containing OriginatorInfo, which can lead to a write to an invalid memory address or double free.

CMS support is disabled by default in OpenSSL 0.9.8 versions, mitigating this vulnerability.

CVE-2010-0740 is a vulnerability that can cause an OpenSSL client or server to crash due to a read attempt at NULL in TLS connections.

Incorrectly formatted records can trigger this crash.

CVE-2010-0433 is a missing return value check flaw in OpenSSL, which can cause a NULL pointer dereference crash in the MIT Kerberos library.

A remote attacker could use this flaw to crash a TLS/SSL server using OpenSSL by requesting Kerberos cipher suites during the TLS handshake.

CVE-2009 Vulnerabilities were a set of bugs found in OpenSSL. One such vulnerability, CVE-2009-3245, allowed an attacker to crash or execute arbitrary code in an application using the OpenSSL library.

This was due to the library not always checking the return value of the bn_wexpand() function. The function ASN1_STRING_print_ex() was also vulnerable, crashing with an invalid memory access if the encoded length of a string was illegal.

The function CMS_verify() did not correctly handle an error condition involving malformed signed attributes, causing an invalid set of signed attributes to appear valid. This was fixed in OpenSSL version 0.9.8j.

Here are the affected OpenSSL versions for each vulnerability:

CVE-2009-3245 is a vulnerability that affects OpenSSL. An attacker can cause an application using the OpenSSL library to crash or execute arbitrary code by triggering a memory allocation failure in the bn_wexpand() function.

This vulnerability is not just a theoretical risk, it's a real-world threat that can be exploited by malicious actors. The bn_wexpand() function is a critical component of the OpenSSL library, and its failure can have serious consequences.

The OpenSSL library is widely used in many applications, including SSL servers, clients, and S/MIME software. This means that many organizations and individuals may be vulnerable to this attack.

A simple example of how this vulnerability can be exploited is by triggering a memory allocation failure in the bn_wexpand() function. This can be done by crafting a malicious input that causes the function to fail.

In summary, CVE-2009-3245 is a serious vulnerability that can cause significant harm to applications using the OpenSSL library.

CVE-2009-1377 fixed a denial of service flaw in the DTLS implementation. This flaw allowed an attacker to send records with future epochs, causing the server to run out of memory.

The DTLS implementation buffered records with future epochs to be processed after the corresponding handshake. There was no limitation to this buffer, making it vulnerable to a DOS attack.

An attacker could perform a DOS attack on a DTLS server by sending records with future epochs. This would continue until the server ran out of memory.

CVE-2009-0591 was a vulnerability that affected OpenSSL versions prior to 0.9.8j.

The function CMS_verify() was not designed to handle malformed signed attributes correctly.

This led to an invalid set of signed attributes appearing valid, and content digests were not checked.

The vulnerability was present in OpenSSL versions 0.9.8 before 0.9.8j.

Here's a list of affected versions:

CVE-2009-3555 is a notable vulnerability that OpenSSL addressed by implementing RFC5746 to fix issues with SSL/TLS renegotiation.

This fix was included in OpenSSL version 0.9.8m, which can be tracked through the 0.9.8m git commit.

The vulnerability affected OpenSSL versions from 0.9.8f before 0.9.8h.

CVE-2009-1378 was a denial of service flaw in the DTLS implementation. This allowed a remote attacker to cause a DTLS server to crash by sending out of sequence handshake messages.

The flaw occurred in the dtls1_process_out_of_seq_message() function, where a crucial check was missing. This check determined if the current message was already buffered.

As a result, memory was allocated for every new message, giving an attacker the means to perform a denial of service attack. The attack worked by sending out of sequence handshake messages until there was no memory left.

This vulnerability was discovered in the crypto libraries, specifically in the crypto/comp/c_zlib.c file. The zlib_stateful_finish function was affected, allowing a memory leak that could cause a denial of service.

In the end, a fix was implemented to address this vulnerability. The fix ensured that the DTLS server could handle out of sequence handshake messages without crashing.

CVE-2009-3555 was a serious vulnerability that affected OpenSSL versions from 0.9.8f to 0.9.8h.

The vulnerability was related to SSL/TLS renegotiation, which is a process that allows a client and server to re-establish a secure connection.

To address this issue, the OpenSSL team implemented RFC5746, a standard that provides a secure way to renegotiate SSL/TLS connections.

This update was included in OpenSSL version 0.9.8m, which was a patch release that fixed several security issues.

A Git commit was made to track the changes made in version 0.9.8m, which included the fix for CVE-2009-3555.

Here are the details of CVE-2009-3555:

CVE-2009-3555 affected OpenSSL versions from 0.9.8f before 0.9.8h.

The CVE-2008-2007 vulnerability was a serious issue that affected the OpenSSL library. It was a buffer overflow bug that could be exploited by attackers to execute arbitrary code.

The vulnerability was discovered in 2008 and was assigned the CVE identifier CVE-2008-2007. It was a critical issue that required immediate attention.

The bug was caused by a flawed implementation of the SSL/TLS protocol in OpenSSL, which allowed attackers to overflow a buffer and execute malicious code. This was a significant security risk that needed to be addressed promptly.

CVE-2008-5077 was a significant vulnerability discovered by the Google Security Team.

The flaw affected the signature checks on DSA and ECDSA keys used with SSL/TLS.

A remote attacker could exploit this issue by presenting a malformed SSL/TLS signature from a certificate chain to a vulnerable client, bypassing validation.

This vulnerability was particularly concerning because it allowed a malicious server or a "man in the middle" attack to succeed, making it a serious security concern.

The Google Security Team's discovery highlighted the importance of thorough testing and validation in cryptographic protocols.

You might like: Verify Ssl Certificate Chain Openssl

CVE-2008-1672 was a significant vulnerability discovered in OpenSSL 0.9.8f and OpenSSL 0.9.8g.

The Codenomicon TLS test suite identified a flaw that occurred when the 'Server Key exchange message' was omitted from a TLS handshake.

This flaw could be exploited by a malicious server with specific cipher suites, causing the client to crash.

The Codenomicon TLS test suite played a crucial role in discovering this vulnerability.

CVE-2007-2006 Vulnerabilities were identified in the OpenSSL FIPS Object Module.

CVE-2007-5502 was a specific vulnerability that affected the PRNG implementation in fips-1.1.1 before fips-1.1.2.

The PRNG implementation did not perform auto-seeding during the FIPS self-test, which generated random data that was more predictable than expected. This made it easier for attackers to bypass protection mechanisms that relied on the randomness.

This vulnerability was a result of the predictable random data generated by the FIPS self-test.

CVE-2007-5502 was a significant issue, as it compromised the security of systems relying on the OpenSSL FIPS Object Module.

In 2006, several vulnerabilities were discovered in OpenSSL, affecting various versions of the library. CVE-2006-2937 and CVE-2006-2940 were both related to parsing invalid ASN.1 structures and public key processing, respectively.

CVE-2006-2937, for instance, caused an infinite loop that consumed system memory during the parsing of certain invalid ASN.1 structures. CVE-2006-2940, on the other hand, allowed an attacker to use a denial of service attack by processing certain types of public keys.

A buffer overflow in the SSL_get_shared_ciphers() utility function was discovered in CVE-2006-3738, which could be exploited by an attacker to overrun a buffer. This vulnerability affected versions 0.9.6 before 0.9.6d, 0.9.7 before 0.9.7h, and 0.9.8 before 0.9.8a.

CVE-2006-2937 is a vulnerability that affects certain versions of software. It was discovered that the parsing of invalid ASN.1 structures could lead to an infinite loop.

This infinite loop consumes system memory, which can cause serious issues, especially on systems with limited resources. The vulnerability affects versions 0.9.7 before 0.9.7l and 0.9.8 before 0.9.8d.

The following versions are affected:

CVE-2006-2940 was a vulnerability that could be exploited by an attacker in a denial of service attack. Certain types of public key took disproportionate amounts of time to process, making them a potential target for abuse.

This vulnerability was a serious concern, as it could be used to overwhelm a system with slow processing times.

CVE-2006-3738 is a buffer overflow vulnerability that affects the SSL_get_shared_ciphers() utility function.

An attacker could send a list of ciphers to an application that uses this function and overrun a buffer.

The vulnerability exists in versions of OpenSSL from 0.9.7 before 0.9.7h and from 0.9.8 before 0.9.8a.

Additionally, versions of OpenSSL from 0.9.6 before 0.9.6d are also affected.

Here's a breakdown of the affected versions:

CVE-2006-4343 is a serious vulnerability that affects OpenSSL.

A flaw in the SSLv2 client code was discovered, which can cause a client to crash when connecting to a malicious server. This vulnerability affects OpenSSL versions 0.9.7 before 0.9.7d and 0.9.6c before 0.9.6m.

To understand the severity of this issue, consider the potential consequences of a client application crashing due to a malicious server. This could result in data loss, system instability, or even a complete system failure.

The following versions of OpenSSL are affected by this vulnerability:

The CVE-2005-2004 vulnerabilities can only be exploited if a server is configured to request client authentication, which is a characteristic of mutual TLS (mTLS) setups.

In mTLS, the server authenticates the client's identity based on a certificate sent by the client, making it vulnerable to exploitation if a malicious client sends a specially-crafted certificate.

For TLS clients, vulnerabilities can be exploited if they connect to an attacker-controlled server, which might happen if a user is phished or their traffic is being redirected due to a man-in-the-middle (MITM) attack.

CVE-2005-2969 was a vulnerability in OpenSSL that allowed an attacker to force a connection to downgrade to SSL 2.0.

This vulnerability was caused by a deprecated option, SSL_OP_MISE_SSLV2_RSA_PADDING, which could be exploited by an attacker acting as a "man in the middle".

The affected versions were 0.9.7 before 0.9.7f and 0.9.6 before 0.9.6-cvs.

A fix for this vulnerability was included in version 0.9.7f.

CVE-2004-0081 was a serious vulnerability found in OpenSSH.

It was discovered that the Codenomicon TLS Test Tool found unknown message types were handled incorrectly.

A remote attacker could cause a denial of service (infinite loop) due to this vulnerability.

This was a significant issue, as it allowed an attacker to disrupt the normal functioning of the system.

The vulnerability was present in OpenSSH versions 0.9.7 before 0.9.7c.

This was a critical update that needed to be applied to prevent exploitation of this vulnerability.

CVE-2002-2001 Vulnerabilities were found in OpenSSL, a widely used cryptography library. This vulnerability was caused by a buffer overflow attack.

The use of assertions when detecting buffer overflow attacks allowed remote attackers to cause a denial of service (crash) in OpenSSL. This was demonstrated using SSLv2 CLIENT_MASTER_KEY messages.

Sending certain messages to OpenSSL could cause it to abort from a failed assertion. This was not properly handled in the s2_srvr.c file.