CVE-2023-27597 : Vulnerability Insights and Analysis

This CVE-2023-27597 relates to a vulnerability found in OpenSIPS affecting versions prior to 3.1.8 and 3.2.5 when processing a specially crafted SIP message using the function

rewrite_ruri

. This vulnerability can lead to a crash resulting from a segmentation fault, causing the server to crash. The issue impacts configurations utilizing functions like

setport

.

Understanding CVE-2023-27597

This section will provide insights into the nature of CVE-2023-27597, its impact, technical details, and mitigation strategies.

What is CVE-2023-27597?

CVE-2023-27597 is a vulnerability in OpenSIPS related to improper input validation in the

parse_uri()

function. It has a CVSS v3.1 base score of 7.5, classified as a high severity issue with a high availability impact.

The Impact of CVE-2023-27597

The vulnerability can be exploited remotely with low attack complexity, posing a significant risk to systems running vulnerable versions of OpenSIPS. If exploited, it can lead to denial of service scenarios due to server crashes.

Technical Details of CVE-2023-27597

Delving into the technical aspects of the CVE-2023-27597 vulnerability provides a better understanding of how it operates.

Vulnerability Description

The vulnerability stems from improper input validation in the

parse_uri()

function, allowing specially crafted SIP messages to trigger a crash in OpenSIPS versions prior to 3.1.8 and 3.2.5.

Affected Systems and Versions

OpenSIPS versions earlier than 3.1.8 and 3.2.5 are impacted by this vulnerability. Specifically, versions

< 3.1.8

and

>= 3.2.0, < 3.2.5

are susceptible to exploitation.

Exploitation Mechanism

By sending a specially crafted SIP message to the affected function

rewrite_ruri

, attackers can trigger a segmentation fault leading to a server crash, thereby disrupting its availability.

Mitigation and Prevention

Understanding how to mitigate and prevent exploitation of CVE-2023-27597 is crucial for safeguarding systems against potential attacks.

Immediate Steps to Take

Update OpenSIPS to version 3.1.8 or 3.2.5 to patch the vulnerability and prevent exploitation.
Disable or restrict access to functions like

setport

that rely on the vulnerable code to limit exposure.

Long-Term Security Practices

Regularly monitor for security advisories and updates from OpenSIPS to stay informed about potential vulnerabilities.
Conduct regular security assessments and audits to identify and address any security gaps proactively.

Patching and Updates

Ensure timely application of security patches released by OpenSIPS to address known vulnerabilities and strengthen the overall security posture of the server.