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CVE-2021-31566

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Date: August 22, 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.

Language: C

Severity Score

Related Resources (11)

https://nvd.nist.gov/vuln/detail/CVE-2021-31566
https://github.com/libarchive/libarchive/commit/8a1bd5c18e896f0411a991240ce0d772bb02c840
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-31566
https://github.com/libarchive/libarchive/issues/1566
https://bugzilla.redhat.com/show_bug.cgi?id=2024237
https://security-tracker.debian.org/tracker/CVE-2021-31566
https://security.alpinelinux.org/vuln/CVE-2021-31566
https://github.com/libarchive/libarchive/commit/b41daecb5ccb4c8e3b2c53fd6147109fc12c3043
https://lists.debian.org/debian-lts-announce/2022/11/msg00030.html
https://access.redhat.com/security/cve/CVE-2021-31566
https://www.mend.io/vulnerability-database/CVE-2021-31566

Severity Score

Weakness Type (CWE)

Improper Link Resolution Before File Access ('Link Following')

CWE-59

Top Fix

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Upgrade Version

Upgrade to version libarchive - 3.5.2

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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