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

[Matt Riddell (NZ)]

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Tzafrir Cohen wrote:
> On Tue, Jul 18, 2006 at 10:13:58AM +1200, Matt Riddell (NZ) wrote:
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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.
> 
> If you wish to find more information and follow the links to ISS
> Xforce's site, you'll actually get irrelevant and misleading
> information.
> 
> I remember the issue of amplification raised in the dev list a number of
> monthes ago regarding both SIP and IAX2. It is still not clear from
> those texts what version 1.2.10 has actually fixed here. Where can I
> find more details?

Yeah, the amplification one is not fixed.  The IAX2 DoS one is however
fixed.  As I'm sure you've noticed, there is some discussion on the
methods to fix the second one going on in the dev list at the moment.

Kevin's response is here:

http://www.sineapps.com/news.php?rssid=1382

- --
Cheers,

Matt Riddell
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