CVE-2021-36976

Publication date 20 July 2021

Last updated 24 July 2024

Ubuntu priority

Why this priority?

Cvss 3 Severity Score

Score breakdown

libarchive 3.4.1 through 3.5.1 has a use-after-free in copy_string (called from do_uncompress_block and process_block).

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libarchive	22.04 LTS jammy	Fixed 3.5.2-1ubuntu1
	21.10 impish	Fixed 3.4.3-2ubuntu0.1
	21.04 hirsute	Ignored end of life
	20.10 groovy	Ignored end of life
	20.04 LTS focal	Fixed 3.4.0-2ubuntu1.1
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

mdeslaur

introduced by: https://github.com/libarchive/libarchive/commit/47bb8187d3ef2d49ee8c7841cb2872b3cfa1f6f7 this was backported by the upstream-rar-window-mask.patch patch in focal

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libarchive	Upstream: https://github.com/libarchive/libarchive/pull/1491 Upstream: https://github.com/libarchive/libarchive/pull/1492 Upstream: 7d3c18a Upstream: b967588

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-5291-1
libarchive vulnerabilities
17 February 2022