Vulnerability CVE-2009-2726
Published: 2009-08-12   Modified: 2012-02-13

Description:
The SIP channel driver in Asterisk Open Source 1.2.x before 1.2.34, 1.4.x before 1.4.26.1, 1.6.0.x before 1.6.0.12, and 1.6.1.x before 1.6.1.4; Asterisk Business Edition A.x.x, B.x.x before B.2.5.9, C.2.x before C.2.4.1, and C.3.x before C.3.1; and Asterisk Appliance s800i 1.2.x before 1.3.0.3 does not use a maximum width when invoking sscanf style functions, which allows remote attackers to cause a denial of service (stack memory consumption) via SIP packets containing large sequences of ASCII decimal characters, as demonstrated via vectors related to (1) the CSeq value in a SIP header, (2) large Content-Length value, and (3) SDP.

See advisories in our WLB2 database:
Topic
Author
Date
High
AST-2009-005: Remote Crash Vulnerability in SIP channel driver
Asterisk Securit...
14.08.2009

Type:

CWE-399

 (Resource Management Errors)

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.8/10
6.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Complete
Affected software
Asterisk -> Business edition 
Asterisk -> Open source 
Asterisk -> Opensource 
Asterisk -> Appliance s800i 

 References:
http://downloads.digium.com/pub/security/AST-2009-005.html
http://labs.mudynamics.com/advisories/MU-200908-01.txt
http://www.securityfocus.com/archive/1/505669/100/0/threaded
http://www.securityfocus.com/bid/36015
http://www.securitytracker.com/id?1022705
http://www.vupen.com/english/advisories/2009/2229
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