CVE-2023-28095 : What You Need to Know

This CVE record pertains to a vulnerability found in OpenSIPS, a Session Initiation Protocol (SIP) server implementation. The vulnerability exists in versions prior to 3.1.7 and 3.2.4 and could potentially lead to a server crash.

Understanding CVE-2023-28095

This section delves into the details of CVE-2023-28095, including its description, impact, technical aspects, and mitigation strategies.

What is CVE-2023-28095?

The vulnerability in OpenSIPS arises from a potential issue in the

msg_translator.c:2628

function, which was discovered during fuzzing of the

build_res_buf_from_sip_req

function. However, it could not be replicated in a running instance of OpenSIPS. Exploitation of this issue is deemed highly unlikely and, even if achieved through unknown means, would likely result in a Denial of Service attack. The vulnerability has been addressed in versions 3.1.7 and 3.2.4.

The Impact of CVE-2023-28095

Since the exploitability of the vulnerability is low and it does not affect any public functions of OpenSIPS, the impact is limited to a potential server crash, primarily leading to Denial of Service.

Technical Details of CVE-2023-28095

This section provides a deeper insight into the vulnerability, including its description, affected systems and versions, and exploitation mechanism.

Vulnerability Description

The vulnerability stems from an issue in OpenSIPS' code that could cause a server crash. However, due to the lack of exploitability against running instances and absence of public functions utilizing the vulnerable code, the risk of exploitation is minimal.

Affected Systems and Versions

Versions of OpenSIPS prior to 3.1.7 and 3.2.4 are impacted by this vulnerability. Specifically, versions

< 3.1.7

and

>= 3.2.0, < 3.2.4

are considered affected.

Exploitation Mechanism

The vulnerability resides in the

msg_translator.c:2628

function but could not be reproduced in a live OpenSIPS instance. Even in the event of exploitation through unknown vectors, the likelihood of a successful attack leading to anything beyond a Denial of Service is very low.

Mitigation and Prevention

This section outlines the steps to mitigate and prevent exploitation of CVE-2023-28095, ensuring the security of OpenSIPS servers.

Immediate Steps to Take

Upgrade OpenSIPS to versions 3.1.7 or 3.2.4 to mitigate the vulnerability.
Monitor for any unusual server behavior that could indicate attempted exploitation of this issue.

Long-Term Security Practices

Regularly update OpenSIPS to the latest versions to patch any potential security vulnerabilities.
Conduct regular security audits and pen-testing to identify and address any new vulnerabilities that may arise.

Patching and Updates

Stay informed about security advisories from OpenSIPS to promptly apply patches and updates that address known vulnerabilities.
Implement robust security measures, such as firewalls and intrusion detection systems, to protect against potential attacks.