CVE-2022-24793 : Security Advisory and Response

A heap buffer overflow vulnerability was identified in PJSIP, impacting applications that utilize PJSIP DNS resolution. This vulnerability, tracked as CVE-2022-24793, specifically affects versions 2.12 and earlier of the PJSIP library.

Understanding CVE-2022-24793

This section delves into the specifics of the CVE-2022-24793 vulnerability.

What is CVE-2022-24793?

CVE-2022-24793 is a heap buffer overflow vulnerability found in the PJSIP library, occurring during the parsing of DNS packets. The vulnerability impacts applications that utilize PJSIP DNS resolution and can result in a denial-of-service condition.

The Impact of CVE-2022-24793

The vulnerability affects PJSIP applications leveraging DNS resolution functionality, potentially leading to a heap buffer overflow. A successful exploit could enable an attacker to crash the application or execute arbitrary code.

Technical Details of CVE-2022-24793

This section provides technical insights into the CVE-2022-24793 vulnerability.

Vulnerability Description

The vulnerability arises in the query record parsing function

parse_rr()

in PJSIP version 2.12 and earlier. By exploiting this issue, an attacker could trigger a heap buffer overflow.

Affected Systems and Versions

Vendor: pjsip Product: pjproject Versions Affected: <= 2.12

Exploitation Mechanism

To exploit CVE-2022-24793, an attacker would need to craft a specially designed DNS packet to trigger the buffer overflow during parsing, potentially leading to malicious code execution.

Mitigation and Prevention

Explore the mitigation strategies to secure systems from CVE-2022-24793.

Immediate Steps to Take

Apply the available patch from the

master

branch of the

pjsip/pjproject

GitHub repository.
Alternatively, disable DNS resolution in PJSIP configuration by setting

nameserver_count

to zero or switch to an external resolver.

Long-Term Security Practices

To enhance overall system security:

Regularly update PJSIP and related dependencies.
Implement network segmentation and robust access controls.
Conduct security audits and implement secure coding practices.

Patching and Updates

Stay updated with the latest security advisories and promptly apply patches to protect against known vulnerabilities like CVE-2022-24793.