CVE-2021-23177: Improper Link Resolution Before File Access ('Link Following')

August 23, 2022 (updated December 3, 2022)

An improper link resolution flaw while extracting an archive can lead to changing the access control list (ACL) of the target of the link. 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 change the ACL of a file on the system and gain more privileges.

References

access.redhat.com/security/cve/CVE-2021-23177
bugzilla.redhat.com/show_bug.cgi?id=2024245
github.com/libarchive/libarchive/commit/fba4f123cc456d2b2538f811bb831483bf336bad
github.com/libarchive/libarchive/issues/1565
nvd.nist.gov/vuln/detail/CVE-2021-23177

Code Behaviors & Features

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