Computer Security
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Asterisk IAX2 calls spoofing
SecurityVulns ID:8940
Threat Level:
Description:Insuficient check of server ACK and weak call number generation allows blind spoofing.
Affected:ASTERISK : Asterisk 1.2
 DIGIUM : Asterisk 1.4
 ASTERISK : Asterisk s800i
 ASTERISK : AsteriskNOW 1.0
CVE:CVE-2008-1897 (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; 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, 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.)
Original documentdocumentASTERISK, AST-2008-006 - 3-way handshake in IAX2 incomplete (24.04.2008)

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