CVE-2008-1897 - Floral Searches


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.