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>> Asterisk Products SIP Channel Driver Remote Denial of Service Vulnerability

Title : Asterisk Products SIP Channel Driver Remote Denial of Service Vulnerability
VUPEN ID : VUPEN/ADV-2007-2953
CVE ID : CVE-2007-4455
Rated as : Low Risk 
Remotely Exploitable : Yes
Locally Exploitable : Yes
Release Date : 2007-08-23


Technical Description    Receive VUPEN Security alerts in a Text format  Receive VUPEN Security alerts in a PDF format  Receive VUPEN Security alerts in an XML format  Receive VUPEN Security notifications by SMS 

A vulnerability has been identified in various Asterisk products, which could be exploited by remote attackers to cause a denial of service. This issue is caused by an error in the SIP channel driver within the handling of SIP dialog history, which could be exploited by remote unauthenticated attackers to exhaust all available memory resources, creating a denial of service condition.

Affected Products

Asterisk Open Source versions prior to 1.4.11
AsteriskNOW versions prior to beta7
Asterisk Appliance Developer Kit versions prior to 0.8.0
Asterisk Appliance s800i versions prior to 1.0.3

Solution

Upgrade to Asterisk version 1.4.11 :
ftp://ftp.digium.com/pub/telephony/asterisk

Upgrade to AsteriskNOW beta7 :
http://www.asterisknow.org

Upgrade to Asterisk Appliance Developer Kit version 0.8.0 :
ftp://ftp.digium.com/pub/telephony/aadk/

Upgrade to Asterisk Appliance s800i version 1.0.3 :
http://www.digium.com/en/supportcenter/

References

http://www.vupen.com/english/advisories/2007/2953
http://downloads.digium.com/pub/asa/AST-2007-020.pdf

Credits

Vulnerability reported by Jon Moldenauer.

ChangeLog

2007-08-23 : Initial release

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