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>> Asterisk SIP Channel Driver BYE Message Denial of Service Vulnerability

Title : Asterisk SIP Channel Driver BYE Message Denial of Service Vulnerability
VUPEN ID : VUPEN/ADV-2008-0019
CVE ID : CVE-2008-0095
Rated as : Low Risk 
Remotely Exploitable : Yes
Locally Exploitable : Yes
Release Date : 2008-01-03


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A vulnerability has been identified in Asterisk, which could be exploited by attackers to cause a denial of service. This issue is caused by a NULL pointer dereference error when handling BYE messages with Also transfer method, which could be exploited by remote attackers to crash a vulnerable application, creating a denial of service condition.

Affected Products

Asterisk Open Source versions prior to 1.4.17
Asterisk Business Edition versions prior to C.1.0-beta8
AsteriskNOW versions prior to beta7
Asterisk Appliance Developer Kit
Asterisk Appliance s800i versions prior to 1.0.3.4

Solution

Upgrade to Asterisk version 1.4.17 :
ftp://ftp.digium.com/pub/telephony/asterisk

Upgrade to Asterisk Business Edition version C.1.0 :
http://www.digium.com/en/supportcenter/

Upgrade to AsteriskNOW Beta7 :
http://www.asterisknow.org

Upgrade to Asterisk Appliance Developer Kit version SVN revision 95946 :
ftp://ftp.digium.com/pub/telephony/aadk/

Upgrade to Asterisk Appliance s800i version 1.0.3.4 :
http://www.digium.com/en/supportcenter/

References

http://www.vupen.com/english/advisories/2008/0019
http://downloads.digium.com/pub/security/AST-2008-001.html

Credits

Vulnerability reported by Grey VoIP.

ChangeLog

2008-01-03 : Initial release

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