CVE-2023-28097 : Vulnerability Insights and Analysis

A vulnerability has been identified in OpenSIPS, a Session Initiation Protocol (SIP) server implementation. This vulnerability, assigned CVE-2023-28097, affects OpenSIPS versions prior to 3.1.9 and 3.2.6, allowing for a segmentation fault to occur due to a malformed SIP message with a large Content-Length value and a specially crafted Request-URI.

Understanding CVE-2023-28097

This section delves deeper into the nature of the CVE-2023-28097 vulnerability in OpenSIPS.

What is CVE-2023-28097?

CVE-2023-28097 is a vulnerability found in OpenSIPS versions before 3.1.9 and 3.2.6, triggered by a malformed SIP message with specific characteristics, leading to a segmentation fault in the server.

The Impact of CVE-2023-28097

The impact of this vulnerability is rated as high, with a CVSS v3.1 base score of 7.5. It can result in an availability impact with no compromise to confidentiality or integrity.

Technical Details of CVE-2023-28097

In this section, we explore the technical details surrounding CVE-2023-28097, including its description, affected systems and versions, and exploitation mechanism.

Vulnerability Description

The vulnerability arises from a malformed SIP message with a large Content-Length value and crafted Request-URI, causing a segmentation fault in OpenSIPS due to excessive shared memory allocation.

Affected Systems and Versions

OpenSIPS versions prior to 3.1.9 and 3.2.6 are impacted by this vulnerability. Specifically, versions < 3.1.9 and >= 3.2.0, < 3.2.6 are affected.

Exploitation Mechanism

Exploiting this vulnerability involves sending a specially crafted SIP message with a manipulated Content-Length value and Request-URI to trigger a segmentation fault in vulnerable OpenSIPS instances.

Mitigation and Prevention

Mitigating the risks associated with CVE-2023-28097 involves taking immediate steps, implementing long-term security practices, and applying relevant patches and updates.

Immediate Steps to Take

To mitigate the vulnerability, ensure that the Content-Length value in input messages never exceeds 2147483647, as a temporary workaround until affected systems can be updated.

Long-Term Security Practices

Implementing robust security practices, such as regular vulnerability assessments, network monitoring, and strict message validation protocols, can help prevent similar vulnerabilities in the future.

Patching and Updates

The recommended course of action is to update OpenSIPS to versions 3.1.9 and 3.2.6 or later, where the vulnerability has been addressed through fixes and patches to ensure system security.