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
Alias: CVE-2016-4556
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=moderate,public=20160506,repor...
Keywords: Security
Depends On: 1334489 1334490 1334491 1334492 1334499 1334500 1334787
Blocks: 1334247
TreeView+ depends on / blocked
 
Reported: 2016-05-10 14:18 UTC by Cedric Buissart 🐶
Modified: 2019-06-08 21:11 UTC (History)
4 users (show)

(edit)
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.
Clone Of:
(edit)
Last Closed: 2016-06-09 12:43:47 UTC


Attachments (Terms of Use)


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 09:56:15 UTC
Red Hat Product Errata RHSA-2016:1139 normal SHIPPED_LIVE Moderate: squid security update 2016-05-31 09:42:41 UTC
Red Hat Product Errata RHSA-2016:1140 normal SHIPPED_LIVE Moderate: squid34 security update 2016-05-31 09:56:07 UTC

Description Cedric Buissart 🐶 2016-05-10 14:18:33 UTC
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 14:19:03 UTC
Created busybox tracking bugs for this issue:

Affects: fedora-all [bug 1334787]

Comment 4 errata-xmlrpc 2016-05-31 05:43:44 UTC
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 05:57:26 UTC
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 05:58:06 UTC
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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