CVE-2020-18778 : Security Advisory and Response

In Libav 12.3, a heap-based buffer over-read vulnerability in vc1_decode_p_mb_intfi in vc1_block.c can lead to denial-of-service attacks via a malicious file.

Understanding CVE-2020-18778

This CVE entry describes a specific vulnerability in Libav 12.3 that can be exploited to cause denial-of-service.

What is CVE-2020-18778?

The vulnerability in Libav 12.3 allows an attacker to trigger a heap-based buffer over-read in vc1_decode_p_mb_intfi in vc1_block.c by using a specially crafted file, resulting in a denial-of-service condition.

The Impact of CVE-2020-18778

The exploitation of this vulnerability can lead to denial-of-service attacks, potentially disrupting the normal operation of the affected system.

Technical Details of CVE-2020-18778

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability involves a heap-based buffer over-read in the vc1_decode_p_mb_intfi function in vc1_block.c within Libav 12.3.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions: Not applicable

Exploitation Mechanism

The vulnerability can be exploited by an attacker through the use of a specially crafted file to trigger the heap-based buffer over-read.

Mitigation and Prevention

To address CVE-2020-18778, consider the following mitigation strategies:

Immediate Steps to Take

Apply security patches or updates provided by the software vendor.
Implement proper input validation mechanisms to prevent malicious file execution.

Long-Term Security Practices

Regularly update software and libraries to the latest versions.
Conduct security assessments and code reviews to identify and address vulnerabilities.

Patching and Updates

Ensure timely installation of patches and updates released by Libav to mitigate the vulnerability.