Bug 1959537 (CVE-2021-33620)

Summary:	CVE-2021-33620 squid: denial of service in HTTP response processing
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	anon.amish, code, icesalov, jonathansteffan, luhliari, mcascell
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	squid 4.15, squid 5.0.6	Doc Type:	If docs needed, set a value
Doc Text:	An input validation flaw was found in Squid. This issue could allow a remote server to perform a denial of service against all clients using the proxy when delivering HTTP response messages. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-09 18:54:44 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1959538, 1960215, 1960216
Bug Blocks:	1959539

Description Guilherme de Almeida Suckevicz 2021-05-11 18:04:54 UTC

Due to an input validation bug Squid is vulnerable to a Denial of Service against all clients using the proxy. This problem allows a remote server to perform Denial of Service when delivering HTTP Response messages. The issue trigger is a header which can be expected to exist in HTTP traffic without any malicious intent by the server.

Reference:
https://github.com/squid-cache/squid/security/advisories/GHSA-572g-rvwr-6c7f/

Comment 1 Guilherme de Almeida Suckevicz 2021-05-11 18:05:11 UTC

Created squid tracking bugs for this issue:

Affects: fedora-all [bug 1959538]

Comment 3 Mauro Matteo Cascella 2021-05-13 10:23:16 UTC

Upstream pull request:
https://github.com/squid-cache/squid/pull/791

Upstream commits:
https://github.com/squid-cache/squid/commit/6c9c44d0e9cf7b72bb233360c5308aa063af3d69 [master]
https://github.com/squid-cache/squid/commit/8af775ed98bfd610f9ce762fe177e01b2675588c [v5]
https://github.com/squid-cache/squid/commit/1e05a85bd28c22c9ca5d3ac9f5e86d6269ec0a8c [v4]

Comment 10 errata-xmlrpc 2021-11-09 18:05:41 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:4292 https://access.redhat.com/errata/RHSA-2021:4292

Comment 11 Product Security DevOps Team 2021-11-09 18:54:41 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-33620