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Vulnerability DatabaseCVE-2021-29972
CVE-2021-29972:
NixOS vulnerability analysis and mitigation
Overview
CVE-2021-29972 is a use-after-free vulnerability discovered in Firefox versions prior to 90. The vulnerability was identified through testing and was traced to an out-of-date Cairo library implementation (Mozilla Advisory, NVD).
Technical details
The vulnerability manifests as a heap-use-after-free issue in the pixmanimage_validate function within the Cairo graphics library. The issue occurs specifically during PDF generation operations when certain CSS properties (clip-path: polygon with values >= 13 and mix-blend-mode: soft-light) are used. The vulnerability has been assigned a CVSS v3.1 score of 8.8 (HIGH) and a CVSS v2.0 score of 6.8 (MEDIUM) (NVD).
Impact
When exploited, this vulnerability could lead to memory corruption and potentially result in a browser crash. The issue specifically manifests when attempting to print or save content as PDF, potentially allowing attackers to execute arbitrary code (Mozilla Advisory).
Mitigation and workarounds
The vulnerability was resolved by updating the Cairo library to a newer version. Users should upgrade to Firefox version 90 or later to receive the fix (Mozilla Advisory).
Additional resources
Source: This report was generated using AI
Related NixOS vulnerabilities:
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