CVE-2021-25802 : Vulnerability Insights and Analysis

A buffer overflow vulnerability in the AVI_ExtractSubtitle component of VideoLAN VLC Media Player 3.0.11 allows attackers to cause an out-of-bounds read via a crafted .avi file.

Understanding CVE-2021-25802

This CVE-2021-25802 is a critical buffer overflow vulnerability found in the AVI_ExtractSubtitle component of VideoLAN VLC Media Player 3.0.11.

What is CVE-2021-25802?

The CVE-2021-25802 vulnerability arises from improper handling of data in the AVI_ExtractSubtitle component of VideoLAN VLC Media Player 3.0.11, leading to a buffer overflow scenario that can be exploited by attackers through a specially crafted .avi file.

The Impact of CVE-2021-25802

Exploitation of this vulnerability could allow malicious actors to trigger an out-of-bounds read, potentially leading to arbitrary code execution, denial of service, or information disclosure on the affected system.

Technical Details of CVE-2021-25802

The technical details of CVE-2021-25802 provide insights into the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability in the AVI_ExtractSubtitle component of VideoLAN VLC Media Player 3.0.11 results in a buffer overflow condition that can be abused by attackers to perform unauthorized out-of-bounds reads.

Affected Systems and Versions

The affected version of VideoLAN VLC Media Player is 3.0.11, exposing systems with this specific version to the security risk posed by CVE-2021-25802.

Exploitation Mechanism

By crafting a malicious .avi file, threat actors can exploit the buffer overflow vulnerability in AVI_ExtractSubtitle to execute unauthorized read operations beyond the allocated memory space.

Mitigation and Prevention

Addressing CVE-2021-25802 requires immediate action and the adoption of long-term security practices to enhance system protection.

Immediate Steps to Take

Users are advised to update VideoLAN VLC Media Player to a patched version to eliminate the vulnerability and reduce the risk of exploitation. Additionally, exercise caution when handling .avi files from unknown or untrusted sources.

Long-Term Security Practices

Regularly update software and apply security patches promptly to prevent potential vulnerabilities from being exploited. Consider implementing security measures such as network segmentation and access controls to enhance overall system resilience.

Patching and Updates

Stay informed about security advisories and updates released by VideoLAN to stay protected against emerging threats and vulnerabilities.