CVE-2020-8517

Publication date 4 February 2020

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

An issue was discovered in Squid before 4.10. Due to incorrect input validation, the NTLM authentication credentials parser in ext_lm_group_acl may write to memory outside the credentials buffer. On systems with memory access protections, this can result in the helper process being terminated unexpectedly. This leads to the Squid process also terminating and a denial of service for all clients using the proxy.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
squid	21.04 hirsute	Fixed 4.9-2ubuntu4
	20.10 groovy	Fixed 4.9-2ubuntu4
	20.04 LTS focal	Fixed 4.9-2ubuntu4
	19.10 eoan	Fixed 4.8-1ubuntu2.2
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
squid3	21.04 hirsute	Not in release
	20.10 groovy	Not in release
	20.04 LTS focal	Not in release
	19.10 eoan	Not in release
	18.04 LTS bionic	Fixed 3.5.27-1ubuntu1.5
	16.04 LTS xenial	Fixed 3.5.12-1ubuntu7.10
	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-4-6982f1187a26557e582172965e266f544ea562a5.patch
squid3	Upstream: http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-c62d2b43ad4962ea44aa0c5edb4cc99cb83a413d.patch

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-4289-1
Squid vulnerabilities
20 February 2020