Bug 1536939 (CVE-2018-1000024)

Summary:	CVE-2018-1000024 squid: Incorrect pointer handling when processing ESI Responses can lead to denial of service
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	code, jonathansteffan, luhliari, thozza, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	squid 3.5.28, squid 4.0.23	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-03-31 22:32:01 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:	1536940, 1582301
Bug Blocks:	1536944

Description Sam Fowler 2018-01-22 05:19:02 UTC

Due to incorrect pointer handling, Squid versions 3.x (prior to 3.5.27) and 4.x (prior to 4.0.23) are vulnerable to a denial of service attack when processing ESI responses. This problem allows a remote server delivering certain ESI response syntax to trigger a denial of service for all clients accessing the Squid service. 

Upstream Advisory:
http://www.squid-cache.org/Advisories/SQUID-2018_1.txt

Upstream Patches:
http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2018_1.patch
http://www.squid-cache.org/Versions/v4/changesets/SQUID-2018_1.patch

Comment 1 Sam Fowler 2018-01-22 05:19:36 UTC

Created squid tracking bugs for this issue:

Affects: fedora-all [bug 1536940]

Comment 3 Stefan Cornelius 2018-05-24 11:24:23 UTC

Mitigation:

A workaround for this issue is to not use the internal ESI parser, which can be achieved by adding either the "esi_parser expat" or "esi_parser libxml2" configuration directive to the squid configuration file (for example /etc/squid/squid.conf).

Comment 7 errata-xmlrpc 2020-03-31 19:18:17 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:1068 https://access.redhat.com/errata/RHSA-2020:1068

Comment 8 Product Security DevOps Team 2020-03-31 22:32:01 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-2018-1000024