Bug 1536939 – CVE-2018-1000024 squid: Incorrect pointer handling when processing ESI Responses can lead to denial of service

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Bug 1536939 - (CVE-2018-1000024) CVE-2018-1000024 squid: Incorrect pointer handling when processing ESI Responses can lead to denial of service

Summary:	CVE-2018-1000024 squid: Incorrect pointer handling when processing ESI Respon...

Status:	NEW

Aliases:	CVE-2018-1000024

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
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Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
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URL:
Whiteboard:	impact=moderate,public=20180119,repor...
Keywords:	Security

Depends On:	1582301 1536940
Blocks:	1536944
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Reported:	2018-01-22 00:19 EST by Sam Fowler
Modified:	2018-10-18 03:35 EDT (History)
CC List:	5 users (show)

See Also:
Fixed In Version:	squid 3.5.27, squid 4.0.23
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RHEL 7.3 requirements from Atomic Host:
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Description Sam Fowler 2018-01-22 00:19:02 EST

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 00:19:36 EST

Created squid tracking bugs for this issue:

Affects: fedora-all [bug 1536940]

Comment 3 Stefan Cornelius 2018-05-24 07:24:23 EDT

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).

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