CVE-2021-43302 : Vulnerability Insights and Analysis

CVE-2021-43302 is a vulnerability in the PJSIP API that allows for out-of-bounds read when calling pjsua_recorder_create. An attacker-controlled 'filename' argument can trigger this issue.

Understanding CVE-2021-43302

This CVE highlights a specific vulnerability in the PJSIP API that can lead to out-of-bounds read scenarios.

What is CVE-2021-43302?

The vulnerability occurs in the PJSUA API when invoking pjsua_recorder_create, where a manipulated 'filename' parameter can cause an out-of-bounds read, especially if the filename length is less than 4 characters.

The Impact of CVE-2021-43302

The impact of this vulnerability is that an attacker could potentially read sensitive information from the system's memory due to the out-of-bounds read, leading to a potential security breach.

Technical Details of CVE-2021-43302

This section delves into the technical specifics of the CVE.

Vulnerability Description

The vulnerability allows for unauthorized information disclosure through an out-of-bounds read triggered by a specific 'filename' parameter in PJSUA API calls.

Affected Systems and Versions

Vendor: teluu
Product: pjsip
Versions Affected: up to 2.11.1

Exploitation Mechanism

The exploitation requires crafting a malicious 'filename' argument that is deliberately shorter than 4 characters, leading to an out-of-bounds read scenario.

Mitigation and Prevention

Addressing and mitigating the CVE-2021-43302 vulnerability is crucial to maintaining system security.

Immediate Steps to Take

Update to the latest patched version of the PJSIP library.
Monitor for any unusual activities on the affected systems.

Long-Term Security Practices

Conduct regular security audits and code reviews to identify vulnerabilities proactively.
Implement input validation checks to prevent malicious inputs from triggering vulnerabilities.

Patching and Updates

Ensure timely installation of security patches and updates issued by the vendor to address known vulnerabilities.