Bug 1334786 – CVE-2016-4556 squid: SIGSEGV in ESIContext response handling

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Bug 1334786 - (CVE-2016-4556) CVE-2016-4556 squid: SIGSEGV in ESIContext response handling

Summary:	CVE-2016-4556 squid: SIGSEGV in ESIContext response handling

Status:	CLOSED ERRATA

Aliases:	CVE-2016-4556

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

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20160506,repor...
Keywords:	Security

Depends On:	1334489 1334490 1334491 1334492 1334499 1334500 1334787
Blocks:	1334247
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Reported:	2016-05-10 10:18 EDT by Cedric Buissart
Modified:	2016-06-27 07:48 EDT (History)
CC List:	4 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:	An incorrect reference counting flaw was found in the way Squid processes ESI responses. If Squid is configured as reverse-proxy, for for TLS/HTTPS interception, an attacker controlling a server accessed by Squid, could crash the squid worker, causing a Denial of Service attack.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2016-06-09 08:43:47 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2016:1138	normal	SHIPPED_LIVE	Moderate: squid security update	2016-05-31 05:56:15 EDT
Red Hat Product Errata	RHSA-2016:1139	normal	SHIPPED_LIVE	Moderate: squid security update	2016-05-31 05:42:41 EDT
Red Hat Product Errata	RHSA-2016:1140	normal	SHIPPED_LIVE	Moderate: squid34 security update	2016-05-31 05:56:07 EDT

Groups: None (edit)

Description Cedric Buissart 2016-05-10 10:18:33 EDT

Due to incorrect reference counting Squid is vulnerable to a denial of service attack when processing ESI responses.

External references:

http://www.squid-cache.org/Advisories/SQUID-2016_9.txt

Upstream fixes:

Squid 3.5:

http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2016_9.patch

Squid 3.4:

http://www.squid-cache.org/Versions/v3/3.4/changesets/SQUID-2016_9.patch

NOTE: 
For the other related CVE, CVE-2016-4555, see Bug 1334246

Comment 1 Cedric Buissart 2016-05-10 10:19:03 EDT

Created busybox tracking bugs for this issue:

Affects: fedora-all [bug 1334787]

Comment 4 errata-xmlrpc 2016-05-31 01:43:44 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:1139 https://access.redhat.com/errata/RHSA-2016:1139

Comment 5 errata-xmlrpc 2016-05-31 01:57:26 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2016:1140 https://access.redhat.com/errata/RHSA-2016:1140

Comment 6 errata-xmlrpc 2016-05-31 01:58:06 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2016:1138 https://access.redhat.com/errata/RHSA-2016:1138

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