National Cyber-Alert System

Vulnerability Summary for CVE-2009-2726

Overview

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.

Impact

CVSS Severity (version 2.0):

CVSS Version 2 Metrics:

References to Advisories, Solutions, and Tools

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External Source: VUPEN

Name: ADV-2009-2229

Type: Advisory

Hyperlink:http://www.vupen.com/english/advisories/2009/2229

External Source: SECTRACK

Name: 1022705

Hyperlink:http://www.securitytracker.com/id?1022705

External Source: BID

Name: 36015

Hyperlink:http://www.securityfocus.com/bid/36015

External Source: BUGTRAQ

Name: 20090811 AST-2009-005: Remote Crash Vulnerability in SIP channel driver

Hyperlink:http://www.securityfocus.com/archive/1/archive/1/505669/100/0/threaded

External Source: SECUNIA

Name: 36227

Type: Advisory

Hyperlink:http://secunia.com/advisories/36227

External Source: MISC

Name: http://labs.mudynamics.com/advisories/MU-200908-01.txt

Hyperlink:http://labs.mudynamics.com/advisories/MU-200908-01.txt

External Source: CONFIRM

Name: http://downloads.digium.com/pub/security/AST-2009-005.html

Hyperlink:http://downloads.digium.com/pub/security/AST-2009-005.html