CVE-2020-18775 : What You Need to Know

In Libav 12.3, a heap-based buffer over-read vulnerability in vc1_decode_b_mb_intfi in vc1_block.c can lead to denial-of-service attacks when processing a malicious file.

Understanding CVE-2020-18775

This CVE entry describes a specific vulnerability in Libav 12.3 that could be exploited by an attacker to cause a denial-of-service condition.

What is CVE-2020-18775?

The vulnerability in Libav 12.3 allows an attacker to trigger a heap-based buffer over-read in vc1_decode_b_mb_intfi in vc1_block.c by using a specially crafted file, potentially leading to a denial-of-service.

The Impact of CVE-2020-18775

Exploitation of this vulnerability could result in a denial-of-service condition, disrupting the normal operation of the affected system.

Technical Details of CVE-2020-18775

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability involves a heap-based buffer over-read in the vc1_decode_b_mb_intfi function in vc1_block.c within Libav 12.3.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions: All versions are affected

Exploitation Mechanism

Attackers can exploit this vulnerability by providing a specially crafted file to trigger the heap-based buffer over-read.

Mitigation and Prevention

To address CVE-2020-18775, consider the following mitigation strategies.

Immediate Steps to Take

Apply security patches or updates provided by the software vendor.
Avoid opening files from untrusted or unknown sources.
Monitor network traffic for any suspicious activities.

Long-Term Security Practices

Implement secure coding practices to prevent buffer over-read vulnerabilities.
Conduct regular security assessments and audits of the software.

Patching and Updates

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