Rule

--
Sid
16212

--
Summary:
This event is generated when an attempt is made to exploit a known vulnerability in Business Edition.

--
Impact:
Denial of Service.   

--
Detailed Information:
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.

--
Affected Systems:
Asterisk Business Edition b.1.3.2
Asterisk Business Edition c.2.3
Asterisk Business Edition c.3.0

--
Attack Scenarios:


--
Ease of Attack:
Medium.

--
False Positives:
None known.

--
False Negatives:
None known.

--
Corrective Action:
Upgrade to the latest non-affected version of the software.

Apply the appropriate vendor supplied patches.

--
Contributors:
Sourcefire Vulnerability Research Team
This document was generated from data supplied by the National Vulnerability Database. A product of the National Institute of Standards and Technology.
For more information see http://nvd.nist.gov/

--
Additional References:

NIST CVE-2009-2726:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2009-2726
  
--
