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CVE-2021-31566

Published: 24 December 2021

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.

Notes

AuthorNote
mdeslaur
intrusive backport to bionic

Priority

Low

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
libarchive
Launchpad, Ubuntu, Debian
hirsute Ignored
(end of life)
lunar Not vulnerable
(3.5.2-1)
trusty Needs triage

upstream
Released (3.5.2-1)
xenial Needs triage

bionic Needed

focal
Released (3.4.0-2ubuntu1.1)
impish
Released (3.4.3-2ubuntu0.1)
jammy Not vulnerable
(3.5.2-1)
kinetic Not vulnerable
(3.5.2-1)
mantic Not vulnerable
(3.5.2-1)
Patches:
upstream: https://github.com/libarchive/libarchive/commit/b41daecb5ccb4c8e3b2c53fd6147109fc12c3043 (v3.5.2)
upstream: https://github.com/libarchive/libarchive/commit/e2ad1a2c3064fa9eba6274b3641c4c1beed25c0b (v3.5.2)
upstream: https://github.com/libarchive/libarchive/commit/8a1bd5c18e896f0411a991240ce0d772bb02c840
upstream: https://github.com/libarchive/libarchive/commit/ede459d2ebb879f5eedb6f7abea203be0b334230

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H