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Asterisk IAX2 Channel Driver Denial of Service
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Secunia Advisory:
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SA26274
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Release Date:
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2007-07-30
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Last Update:
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2007-07-31
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Popularity:
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7,316 views
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Critical:
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Less critical
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Impact:
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DoS
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Where:
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From local network
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Solution Status:
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Vendor Patch
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| Software: | Asterisk 1.x
Asterisk Appliance Developer Kit 0.x
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Subscribe:
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Instant alerts on relevant vulnerabilities 
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| CVE reference: | CVE-2007-4103
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Description:
A vulnerability has been reported in Asterisk, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to the IAX2 Channel Driver improperly processing "NEW" packets. This can be exploited to allocate resources that are never freed by sending multiple "NEW" packets for valid extensions to the server.
Successful exploitation results in a DoS, but requires that the IAX2 Channel Driver is configured to allow unauthenticated calls.
The vulnerability is reported in the following products:
Asterisk Open Source 1.2.x version 1.2.20, 1.2.21, 1.2.21.1, and 1.2.22
Asterisk Open Source 1.4.x version 1.4.5, 1.4.7, 1.4.7.1 and 1.4.8
AsteriskNOW pre-release version beta6
Asterisk Appliance Developer Kit 0.5.0
s800i versions 1.0.0-beta5 to 1.0.2.
Solution:
Asterisk Open Source 1.2.x:
Update to version 1.2.23.
ftp://ftp.digium.com/pub/telephony/asterisk
Asterisk Open Source 1.4.x:
Update to version 1.4.9.
ftp://ftp.digium.com/pub/telephony/asterisk
AsteriskNOW pre-release:
Update to version beta7.
http://www.asterisknow.org
Asterisk Appliance Developer Kit:
Update to version 0.6.0.
ftp://ftp.digium.com/pub/telephony/aadk
s800i:
Update to version 1.0.3.
Provided and/or discovered by:
Russel Bryant
Changelog:
2007-07-31: Added CVE reference.
Original Advisory:
http://ftp.digium.com/pub/asa/ASA-2007-018.pdf
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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