CVE-2021-31566: Improper Link Resolution Before File Access ('Link Following')

August 23, 2022 (updated December 3, 2022)

An improper link resolution flaw can occur while extracting an archive leading to changing modes, times, access control lists, and flags of a file outside of the archive. An attacker may provide a malicious archive to a victim user, who would trigger this flaw when trying to extract the archive. A local attacker may use this flaw to gain more privileges in a system.

References

access.redhat.com/security/cve/CVE-2021-31566
bugzilla.redhat.com/show_bug.cgi?id=2024237
github.com/libarchive/libarchive/commit/b41daecb5ccb4c8e3b2c53fd6147109fc12c3043
github.com/libarchive/libarchive/issues/1566
nvd.nist.gov/vuln/detail/CVE-2021-31566

Code Behaviors & Features

Detect and mitigate CVE-2021-31566 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →