Technical Description

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 Skinny channel driver (chan_skinny) when processing a "CAPABILITIES_RES_MESSAGE" packet with a capabilities count greater than the total number of items in the "capabilities_res_message" array, which could be exploited by remote authenticated attackers to crash a vulnerable application, creating a denial of service condition.

Affected Products

Asterisk Open Source versions prior to 1.4.10
AsteriskNOW versions prior to beta7
Asterisk Appliance Developer Kit versions prior to 0.7.0
Asterisk Appliance s800i versions prior to 1.0.3

Solution

Upgrade to Asterisk version 1.4.10 :
ftp://ftp.digium.com/pub/telephony/asterisk

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

Upgrade to Asterisk Appliance Developer Kit version 0.7.0 :
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/2007/2808
http://downloads.digium.com/pub/asa/ASA-2007-019.pdf

Credits

Vulnerability reported by Wei Wang (McAfee AVERT Labs).

ChangeLog

2007-08-08 : Initial release

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