Asterisk IAX2 FWDOWNL Request Spoofing Remote DoS
Medium Nessus Plugin ID 33564
SynopsisThe remote VoIP service can be abused to conduct an amplification attack against third-party hosts.
DescriptionThe firmware download protocol implemented in the version of Asterisk running on the remote host does not initiate a handshake. By spoofing an IAX2 FWDOWNL request, an unauthenticated, remote attacker may be able to leverage this issue to flood a third-party host with unwanted firmware packets from the affected host.
SolutionUpgrade to Asterisk Open Source 126.96.36.199 / 1.2.30, Asterisk Business Edition C.2.0.3 / C.1.10.3 / B.2.5.4, s800i (Asterisk Appliance) 188.8.131.52 or later.