CVE-2021-43300 : What You Need to Know

The CVE-2021-43300 vulnerability involves a stack overflow in the PJSUA API, potentially leading to a buffer overflow due to inadequate size validation.

Understanding CVE-2021-43300

What is CVE-2021-43300?

The CVE-2021-43300 vulnerability arises from a stack overflow in PJSUA API when calling pjsua_recorder_create, allowing an attacker-controlled 'filename' argument to trigger a buffer overflow.

The Impact of CVE-2021-43300

The vulnerability could allow malicious actors to execute arbitrary code or disrupt the affected system, posing a serious security risk.

Technical Details of CVE-2021-43300

Vulnerability Description

The issue occurs in the PJSUA API, wherein an attacker can exploit the stack overflow by manipulating the 'filename' argument, potentially leading to a buffer overflow due to the lack of size validation.

Affected Systems and Versions

Vendor: teluu
Product: pjsip
Vulnerable Versions: Less than or equal to 2.11.1

Exploitation Mechanism

The vulnerability can be exploited by providing a specifically crafted 'filename' argument to the pjsua_recorder_create function, causing a buffer overflow due to unvalidated input.

Mitigation and Prevention

Immediate Steps to Take

Apply the latest security updates and patches provided by the vendor.
Restrict network access to vulnerable systems.

Long-Term Security Practices

Implement secure coding practices to prevent buffer overflows.
Conduct regular security assessments and code reviews to detect and mitigate similar vulnerabilities.

Patching and Updates

It is crucial to promptly install the latest patches and updates released by teluu to address the CVE-2021-43300 vulnerability.