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.
The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
| Link | Tags |
|---|---|
| http://labs.mudynamics.com/advisories/MU-200908-01.txt | broken link |
| http://www.vupen.com/english/advisories/2009/2229 | vendor advisory broken link vdb entry |
| http://downloads.digium.com/pub/security/AST-2009-005.html | product |
| http://www.securityfocus.com/bid/36015 | vdb entry exploit broken link third party advisory |
| http://www.securityfocus.com/archive/1/505669/100/0/threaded | broken link mailing list third party advisory vdb entry |
| http://www.securitytracker.com/id?1022705 | broken link third party advisory vdb entry |
| http://secunia.com/advisories/36227 | vendor advisory broken link third party advisory |