CVE-2022-38152 : Vulnerability Insights and Analysis

An issue was discovered in wolfSSL before 5.5.0 where a TLS 1.3 client connecting to a wolfSSL server could cause a segmentation fault when SSL_clear is called on its session, leading to a server crash during the subsequent session. This vulnerability affects servers using wolfSSL_clear instead of SSL_free; SSL_new sequence for session structure reuse.

Understanding CVE-2022-38152

This CVE identifies a critical issue in wolfSSL versions prior to 5.5.0 that can be exploited by malicious TLS clients to trigger a server crash through session resumption.

What is CVE-2022-38152?

This CVE pertains to a vulnerability in wolfSSL's session handling mechanism that leads to a server crash when a TLS 1.3 client attempts to resume a session, causing a segmentation fault due to improper memory management.

The Impact of CVE-2022-38152

The vulnerability poses a risk to wolfSSL servers that utilize wolfSSL_clear for session structure reuse, potentially leading to denial of service (DoS) incidents when handling subsequent session resumptions.

Technical Details of CVE-2022-38152

This section delves into the specifics of the vulnerability, including its description, affected systems, and exploitation method.

Vulnerability Description

The flaw arises from the misuse of wolfSSL_clear for session handling within the wolfSSL compatibility layer, triggering a server crash upon receiving a Client Hello during session resumption.

Affected Systems and Versions

All wolfSSL versions preceding 5.5.0 are susceptible to this issue, particularly servers that opt for wolfSSL_clear over the recommended SSL_free; SSL_new procedures for session maintenance.

Exploitation Mechanism

Malicious TLS clients can exploit this vulnerability by initiating a session resumption with a wolfSSL server, causing the server to crash when handling the subsequent Client Hello message.

Mitigation and Prevention

To address CVE-2022-38152, immediate actions and long-term security practices can help safeguard systems against potential exploits.

Immediate Steps to Take

Server administrators are advised to update to wolfSSL version 5.5.0 or newer, implementing proper session management practices and avoiding the use of wolfSSL_clear for session handling.

Long-Term Security Practices

Employing secure coding practices, monitoring security mailing lists for updates, and conducting regular security audits can fortify systems against similar vulnerabilities in the future.

Patching and Updates

Regularly applying security patches and updates released by wolfSSL, along with maintaining awareness of security advisories and best practices, is crucial for mitigating potential risks.