Bug 710441 (CVE-2011-2216)

Summary:	CVE-2011-2216 Asterisk: Remote DoS (crash) in SIP channel driver (AST-2011-007)
Product:	[Other] Security Response	Reporter:	Jan Lieskovsky <jlieskov>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	itamar, jeff, vdanen
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-07-06 19:44:28 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:	710443, 710444
Bug Blocks:

Description Jan Lieskovsky 2011-06-03 12:09:14 UTC

A denial of service flaw was found in the way Asterisk processed malformed
Contact headers in SIP calls. A remote attacker could use this flaw to
cause asterisk server crash via specially-crafted Contact header sent in
a reply upon initialization of a SIP call.

References:
[1] http://packetstormsecurity.org/files/view/101966/AST-2011-007.txt
[2] http://seclists.org/fulldisclosure/2011/Jun/39

Upstream patch (against v1.8.x branch):
[3] http://downloads.asterisk.org/pub/security/AST-2011-007-1.8.diff

Comment 1 Jan Lieskovsky 2011-06-03 12:11:02 UTC

This issue affects the version of the asterisk package, as shipped with
Fedora release of 15 and as present within EPEL-6 repository. Please schedule
and update.

--

This issue did NOT affect the versions of the asterisk package (v1.6.2.17.2
based), as shipped with Fedora release of 13 and 14. Confirmation from
Jonathan Rose of Asterisk upstream follows:

"
This is correct.  Only 1.8 is affected and this is due to a major
overhaul in the sip channel driver to handle URI parsing in a more
generic fashion.  I've tested crash causing exploits against 1.6 and 1.4
and neither were prone to the malformed URI attack."

Comment 2 Jan Lieskovsky 2011-06-03 12:12:43 UTC

Created asterisk tracking bugs for this issue

Affects: fedora-15 [bug 710443]
Affects: epel-6 [bug 710444]