CVE-2022-26498 : Security Advisory and Response

An issue was discovered in Asterisk through 19.x that could result in resource exhaustion when using STIR/SHAKEN due to downloading files other than certificates. The issue is addressed in versions 16.25.2, 18.11.2, and 19.3.2.

Understanding CVE-2022-26498

This CVE highlights a vulnerability in Asterisk that could be exploited to download files leading to resource exhaustion.

What is CVE-2022-26498?

The vulnerability in Asterisk through 19.x allows the download of files other than certificates, potentially causing resource exhaustion due to large file sizes.

The Impact of CVE-2022-26498

If exploited, this vulnerability could lead to resource exhaustion, affecting the availability and performance of the affected systems.

Technical Details of CVE-2022-26498

This section outlines the vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

A flaw in Asterisk through 19.x allows the download of files not limited to certificates, posing a resource exhaustion risk.

Affected Systems and Versions

All versions of Asterisk through 19.x are affected. The issue is fixed in versions 16.25.2, 18.11.2, and 19.3.2.

Exploitation Mechanism

Attackers can exploit this vulnerability by leveraging the ability to download files other than certificates, leading to resource exhaustion.

Mitigation and Prevention

To mitigate the CVE-2022-26498 vulnerability, immediate steps should be taken alongside long-term security practices and timely patching.

Immediate Steps to Take

Ensure systems running affected Asterisk versions are updated to the patched versions (16.25.2, 18.11.2, and 19.3.2) to prevent exploitation.

Long-Term Security Practices

Regularly monitor for security advisories and updates from Asterisk to stay informed about potential vulnerabilities and updates.

Patching and Updates

Apply patches provided by Asterisk promptly to address security vulnerabilities and prevent exploitation.