Bug 1939939 (CVE-2021-28116)

Summary:	CVE-2021-28116 squid: out-of-bounds read in WCCP protocol data may lead to information disclosure
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
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, jorton, lilhuang, luhliari, mkaplan, yjog, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in squid. An out-of-bounds read in the WCCP protocol can be leveraged as part of a chain for remote code execution leading to an information disclosure. The highest threat from this vulnerability is to data confidentiality.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-05-12 02:16:02 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:	1939940, 1941505, 1941506
Bug Blocks:	1934571

Description Marian Rehak 2021-03-17 10:28:46 UTC

In some configurations, squid allows information disclosure because of an out-of-bounds read in WCCP protocol data. This can be leveraged as part of a chain for remote code execution as nobody.

Comment 1 Marian Rehak 2021-03-17 10:29:37 UTC

Created squid tracking bugs for this issue:

Affects: fedora-all [bug 1939940]

Comment 2 Mauro Matteo Cascella 2021-03-19 09:28:58 UTC

External References:

https://www.zerodayinitiative.com/advisories/ZDI-21-157/

Comment 3 Mauro Matteo Cascella 2021-03-19 09:41:24 UTC

*** Bug 1934558 has been marked as a duplicate of this bug. ***

Comment 12 errata-xmlrpc 2022-05-10 14:24:12 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2022:1939 https://access.redhat.com/errata/RHSA-2022:1939

Comment 13 Product Security DevOps Team 2022-05-12 02:16:00 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-2021-28116