CVE-2022-39173 : Security Advisory and Response

A buffer overflow vulnerability in wolfSSL before version 5.5.1 can be exploited by malicious clients during a TLS 1.3 handshake. This CVE was published on September 29, 2022, and carries a significant risk if left unaddressed.

Understanding CVE-2022-39173

wolfSSL versions prior to 5.5.1 are susceptible to a buffer overflow attack that occurs when specific conditions are met during a TLS handshake. This can lead to a security breach and unauthorized access to sensitive information.

What is CVE-2022-39173?

In wolfSSL before version 5.5.1, a buffer overflow vulnerability exists during a TLS 1.3 handshake. By manipulating cipher suites in multiple Client Hello messages, an attacker can trigger the overflow, potentially compromising the security of the system.

The Impact of CVE-2022-39173

The exploitation of this vulnerability could result in unauthorized access, data leakage, or even a complete system takeover. Malicious actors with knowledge of this vulnerability can craft malicious packets to exploit the buffer overflow, leading to severe consequences.

Technical Details of CVE-2022-39173

Vulnerability Description

The buffer overflow occurs in wolfSSL when malicious clients send certain crafted packets during TLS 1.3 handshakes. This leads to a memory corruption issue that can be exploited by attackers to execute arbitrary code or disrupt normal system operation.

Affected Systems and Versions

All versions of wolfSSL prior to 5.5.1 are affected by this vulnerability. Systems using these versions are at risk of exploitation if not promptly addressed with the necessary security measures.

Exploitation Mechanism

To trigger the buffer overflow, an attacker needs to send two Client Hello messages with duplicate cipher suites during a TLS handshake. By meticulously crafting these messages, the attacker can induce the overflow and initiate an attack.

Mitigation and Prevention

Immediate Steps to Take

It is crucial for users of wolfSSL versions before 5.5.1 to update to the latest patched version immediately. Additionally, network administrators should monitor network traffic for any signs of exploitation attempts related to this vulnerability.

Long-Term Security Practices

In the long term, organizations should implement secure coding practices, regularly update software components, and conduct vulnerability assessments to identify and remediate potential security risks.

Patching and Updates

The wolfSSL project has released version 5.5.1 to address the buffer overflow vulnerability. Users are advised to apply this patch promptly and follow best security practices to safeguard their systems from exploitation.