CVE-2021-31806

Publication date 27 May 2021

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request processing.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
squid	24.10 oracular	Fixed 4.13-10ubuntu1
	24.04 LTS noble	Fixed 4.13-10ubuntu1
	23.10 mantic	Fixed 4.13-10ubuntu1
	23.04 lunar	Fixed 4.13-10ubuntu1
	22.10 kinetic	Fixed 4.13-10ubuntu1
	22.04 LTS jammy	Fixed 4.13-10ubuntu1
	21.10 impish	Fixed 4.13-10ubuntu1
	21.04 hirsute	Fixed 4.13-1ubuntu4.1
	20.10 groovy	Fixed 4.13-1ubuntu2.2
	20.04 LTS focal	Fixed 4.10-1ubuntu1.4
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
squid3	24.10 oracular	Not in release
	24.04 LTS noble	Not in release
	23.10 mantic	Not in release
	23.04 lunar	Not in release
	22.10 kinetic	Not in release
	22.04 LTS jammy	Not in release
	21.10 impish	Not in release
	21.04 hirsute	Not in release
	20.10 groovy	Not in release
	20.04 LTS focal	Not in release
	18.04 LTS bionic	Fixed 3.5.27-1ubuntu1.11
	16.04 LTS xenial	Vulnerable
	14.04 LTS trusty	Not in release

Patch details

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

Package	Patch details
squid	Upstream: http://www.squid-cache.org/Versions/v4/changesets/squid-4-e7cf864f938f24eea8af0692c04d16790983c823.patch Upstream: e7cf864

Severity score breakdown

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

References

Related Ubuntu Security Notices (USN)

USN-4981-1
Squid vulnerabilities
3 June 2021