38194 : Asterisk Skinny Channel Driver (chan_skinny) Crafted Packet Remote DoS
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
2	183	over 4 years ago	over 3 years ago	1 times	90%

Timeline

Disclosure Date	Vendor Solution Date
2007-07-17	2007-07-17

Keywords

ASA-2007-016

Description

Asterisk contains a flaw that may allow a remote denial of service. The issue is triggered when a skinny packet is received where the claimed length is between 0 and 3 added with 4 or more bytes. This will issue a segfault via a large memcpy() and will result in loss of availability for the service.

Classification

Location: Remote / Network Access
Attack Type: Denial of Service
Impact: Loss of Availability
Solution: Upgrade
Exploit: Exploit Unknown
Disclosure: Vendor Verified

Technical

This vulnerability is only present when the chan_skinny module is loaded. If this module is not needed a workaround is to disable it to add "noload => chan_skinny.so" to the file '/etc/asterisk/modules.conf'.

Solution

Upgrade to Asterisk version 1.4.8 or 1.2.22, Asterisk Business Edition B.2.2.1, AsteriskNOW beta7, Asterisk Appliance Developer Kit 0.5.0, s800i Appliance 1.0.2 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products

Asterisk	Asterisk	1.0.x
		1.4.8 (not affected)
		1.4.5
		1.4.7.1
		1.4.0-beta1
		1.4.0-beta2
		1.4.0-beta3
		1.4.0-beta4
		1.4.7
		1.4.1
		1.4.2
		1.4.3
		1.4.0
		1.4.4
		1.4.6
		1.2.5
		1.2.0-rc2
		1.2.18
		1.2.0
		1.2.21.1
		1.2.3
		1.2.6
		1.2.17
		1.2.16
		1.2.0-beta1
		1.2.7
		1.2.10
		1.2.8
		1.2.1
		1.2.15
		1.2.9
		1.2.13
		1.2.2
		1.2.14
		1.2.12.1
		1.2.12
		1.2.22 (not affected)
		1.2.9.1
		1.2.11
		1.2.7.1
		1.2.21
		1.2.20
		1.2.4
		1.2.0-beta2
		1.2.0-rc1
		1.2.19
	Asterisk Appliance Developer Kit	0.5.0 (not affected)
		0.4.0
		0.3.2a
		0.2.0
	AsteriskNOW	beta7 (not affected)
		beta5
		beta6
		beta4
		beta3
		beta2
		beta1
	Asterisk Business Edition	A.x.x
		B.2.2.1 (not affected)
		B.1.x
	s800i	1.0.2 (not affected)
	s800i	1.0.1

References

Security Tracker: 1018407
CVE ID: 2007-3764 (see also: NVD)
Secunia Advisory ID: 22588 26099 26602 29051
Bugtraq ID: 24949 24950
ISS X-Force ID: 35466 35478 35480
Related OSVDB ID: 38193 38195 38196
VUPEN Advisory: ADV-2007-2563
Mail List Post: http://archives.neohapsis.com/archives/bugtraq/2007-07/0177.html
Vendor Specific News/Changelog Entry: http://ftp.digium.com/pub/asa/ASA-2007-016.pdf
Other Advisory URL: http://lists.debian.org/debian-security-announce/debian-security-announce-2007/msg00120.html
http://lists.opensuse.org/opensuse-security-announce/2007-08/msg00003.html
http://www.debian.org/security/2007/dsa-1358
http://www.gentoo.org/security/en/glsa/glsa-200802-11.xml
http://www.novell.com/linux/security/advisories/2007_15_sr.html

Tools & Filters

	27158 31294

Credit

Will Drewry - wadgoogle.com - Google Security Team

CVSSv2 Score

CVSSv2 Base Score = 5.0
Source: nvd.nist.gov | Generated: 2007-07-19 | Disagree?

Blogs

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