CVE-2021-45928 : Security Advisory and Response

libjxl b02d6b9, as used in libvips 8.11 through 8.11.2 and other products, has an out-of-bounds write vulnerability in jxl::ModularFrameDecoder::DecodeGroup.

Understanding CVE-2021-45928

This CVE relates to a specific vulnerability found in the libjxl library used in various products like libvips 8.11 through 8.11.2.

What is CVE-2021-45928?

The vulnerability identified as CVE-2021-45928 is an out-of-bounds write issue in the jxl::ModularFrameDecoder::DecodeGroup function.

The Impact of CVE-2021-45928

The vulnerability can potentially allow malicious actors to execute arbitrary code or cause a denial of service through a crafted image file.

Technical Details of CVE-2021-45928

This section delves into the technical aspects of the vulnerability in question.

Vulnerability Description

The vulnerability exists in the jxl::ModularFrameDecoder::DecodeGroup function, which is called from other functions like jxl::FrameDecoder::ProcessACGroup.

Affected Systems and Versions

Affected library version: libvips 8.11 through 8.11.2
Potentially affects other products that utilize libjxl b02d6b9

Exploitation Mechanism

Exploitation may involve crafting a malicious image file that triggers the out-of-bounds write when processed by the vulnerable library.

Mitigation and Prevention

Steps to address and prevent exploitation of the vulnerability.

Immediate Steps to Take

Update libvips to versions beyond 8.11.2 if available
Apply vendor-supplied patches or mitigations

Long-Term Security Practices

Regularly update software and libraries
Implement secure coding practices

Patching and Updates

Stay informed about security updates for the affected products
Monitor official sources for patches and advisories