CVE-2021-32558 : Security Advisory and Response

A security issue was discovered in Sangoma Asterisk versions before 13.38.3, 16.19.1, 17.9.4, and 18.5.1, as well as Certified Asterisk before 16.8-cert10, potentially leading to a crash when handling unsupported media formats.

Understanding CVE-2021-32558

This section will cover the essentials of the CVE to help you understand its implications.

What is CVE-2021-32558?

The CVE-2021-32558 vulnerability pertains to Sangoma Asterisk versions susceptible to crashing when processing unsupportive media types.

The Impact of CVE-2021-32558

The vulnerability could be exploited by an attacker to trigger a crash, potentially causing denial of service or other adverse effects.

Technical Details of CVE-2021-32558

Explore the technical specifics of CVE-2021-32558 for deeper insights.

Vulnerability Description

The issue stems from the IAX2 channel driver's inability to handle certain media formats, leading to a system crash in affected Asterisk versions.

Affected Systems and Versions

Sangoma Asterisk 13.x, 16.x, 17.x, and 18.x, along with Certified Asterisk versions before 16.8-cert10, are impacted by this vulnerability.

Exploitation Mechanism

Exploitation can be carried out by sending a packet with an unsupported media format via the IAX2 channel driver, triggering the crash.

Mitigation and Prevention

Discover the steps to mitigate and prevent potential risks associated with CVE-2021-32558.

Immediate Steps to Take

Immediately update to Sangoma Asterisk versions 13.38.3, 16.19.1, 17.9.4, 18.5.1, or Certified Asterisk 16.8-cert10 to address this vulnerability.

Long-Term Security Practices

Incorporate regular security updates and monitoring practices to safeguard against emerging threats and vulnerabilities.

Patching and Updates

Stay informed about security advisories and promptly apply patches released by Sangoma to maintain a secure environment.