[asterisk-users] Two security holes fixed in latest versions of Asterisk

[Matt Riddell (NZ)]

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From: http://www.sineapps.com/news.php?rssid=1377

ISS Xforce has published details of two security issues in Asterisk 1.x
which were fixed in the recently release 1.2.10 version.

Asterisk IAX2 Protocol Denial of Service Attack

Summary:

ISS X-Force has discovered a denial of service vulnerability in the
Inter-Asterisk eXchange protocol version 2 (IAX2). IAX2 is used by
Asterisk PBX software to exchange Voice over IP call setup and call
content. If an attacker floods the PBX with call requests, the PBX will
be unable to handle new telephone calls.

IAX2 Protocol Denial of Service Amplification Attack

Summary:

ISS X-Force has discovered a traffic amplification vulnerability in the
Inter-Asterisk eXchange protocol version 2 (IAX2). IAX2 is used by
Asterisk PBX software to exchange Voice over IP call setup and call
content. An attacker can leverage accounts without passwords on an
Asterisk PBX to flood a third party with a large amount of UDP packets.
If the attack is properly constructed the amount of traffic generated
can saturate the victim's Internet connection. Networks do not have to
use Asterisk PBX to be the victim of this kind of traffic flood.

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Cheers,

Matt Riddell
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