Two vulnerabilities have been identified in various Asterisk products, which could be exploited by attackers to cause a denial of service.
The first issue is caused by an error when processing multiple IAX2 "POKE" requests without an ACK packet sent in response to the "PONG" packet, which could be exploited to consume all IAX2 call numbers, creating a denial of service condition.
The second vulnerability is caused by an error in the firmware download protocol that does not initiate a handshake when processing requests, which could be exploited to exhaust all available resources via IAX2 FWDOWNL requests.
Credits
Vulnerabilities reported by Jeremy McNamara and Tilghman Lesher.
ChangeLog
2008-07-23 : Initial release
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