CVE-2021-38171 Explained : Impact and Mitigation

A detailed overview of CVE-2021-38171 focusing on its impact, technical details, mitigation, and prevention methods.

Understanding CVE-2021-38171

This section provides insights into CVE-2021-38171, a vulnerability found in FFmpeg 4.4.

What is CVE-2021-38171?

The CVE-2021-38171 vulnerability is associated with the adts_decode_extradata function in libavformat/adtsenc.c in FFmpeg 4.4. It arises due to the failure to verify the init_get_bits return value, a necessary step as the second argument to init_get_bits can be manipulated.

The Impact of CVE-2021-38171

The vulnerability allows an attacker to craft the second argument to init_get_bits, leading to potential exploitation and unauthorized access to systems running the affected FFmpeg version.

Technical Details of CVE-2021-38171

Delving into the specifics of the vulnerability and its implications.

Vulnerability Description

The vulnerability in FFmpeg 4.4 arises from inadequate checking of the init_get_bits return value, enabling attackers to manipulate the second argument to init_get_bits.

Affected Systems and Versions

All systems running FFmpeg 4.4 are vulnerable to CVE-2021-38171, potentially exposing them to exploitation.

Exploitation Mechanism

By crafting the second argument to init_get_bits, threat actors can exploit the vulnerability to gain unauthorized access and compromise systems.

Mitigation and Prevention

Guidelines on addressing and safeguarding systems against CVE-2021-38171.

Immediate Steps to Take

Users are advised to update FFmpeg to a non-vulnerable version and implement additional security measures to mitigate potential risks.

Long-Term Security Practices

Maintaining up-to-date software, conducting regular security audits, and employing access controls can enhance overall system security.

Patching and Updates

Regularly check for security updates for FFmpeg and apply patches promptly to protect against known vulnerabilities.