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This vulnerability has been modified since it was last analyzed by the NVD. It is awaiting reanalysis which may result in further changes to the information provided.
The IAX2 channel driver (chan_iax2) in Asterisk Open Source 1.0.x, 1.2.x before 1.2.28, and 1.4.x before 188.8.131.52; Business Edition A.x.x, B.x.x before B.2.5.2, and C.x.x before C.1.8.1; AsteriskNOW before 1.0.3; Appliance Developer Kit 0.x.x; and s800i before 184.108.40.206, when configured to allow unauthenticated calls, does not verify that an ACK response contains a call number matching the server's reply to a NEW message, which allows remote attackers to cause a denial of service (traffic amplification) via a spoofed ACK response that does not complete a 3-way handshake. NOTE: this issue exists because of an incomplete fix for CVE-2008-1923.
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http://www.securityfocus.com/archive/1/491220/100/0/threaded [No Types Assigned]
http://www.securityfocus.com/archive/1/archive/1/491220/100/0/threaded [No Types Assigned]
https://exchange.xforce.ibmcloud.com/vulnerabilities/41966 [No Types Assigned]
http://xforce.iss.net/xforce/xfdb/41966 [No Types Assigned]