CVE-2021-43301 Explained : Impact and Mitigation

CVE-2021-43301 involves a stack overflow in the PJSUA API due to an attacker-controlled argument, potentially leading to a buffer overflow. Find out more about this vulnerability and how to address it.

Understanding CVE-2021-43301

What is CVE-2021-43301?

CVE-2021-43301 is a vulnerability in the PJSUA API that occurs when calling pjsua_playlist_create. An attacker could exploit this by providing a malicious 'file_names' argument, leading to a buffer overflow in a fixed-size stack buffer.

The Impact of CVE-2021-43301

This vulnerability could allow an attacker to execute arbitrary code or crash the application, posing a significant security risk to systems using the affected versions.

Technical Details of CVE-2021-43301

Vulnerability Description

The vulnerability arises from a lack of size validation when copying user-controlled input to a fixed-size stack buffer.

Affected Systems and Versions

Vendor: teluu
Product: pjsip
Versions affected: up to 2.11.1 (custom version)

Exploitation Mechanism

An attacker can trigger the buffer overflow by providing a malicious 'file_names' argument, exploiting the lack of input validation mechanisms.

Mitigation and Prevention

Immediate Steps to Take

Update the affected system to a version that includes a patch for CVE-2021-43301.
Avoid processing untrusted input without proper validation to prevent buffer overflow vulnerabilities.

Long-Term Security Practices

Implement secure coding practices to validate and sanitize user input effectively.
Conduct regular security assessments and code reviews to identify and address potential vulnerabilities proactively.

Patching and Updates

Ensure timely application of security patches and updates to address known vulnerabilities and protect the system from exploitation.