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Asterisk IAX2 Call Request Flooding Denial of Service

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Release Date:  2006-07-17    Views:  11,689

Secunia Advisory SA21071

Where:

From local network

Impact:

DoS

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

No CVE references.

Description


ISS X-Force has reported a vulnerability in Asterisk, which can be exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an error when handling new call requests and can be exploited to cause Asterisk to stop processing new calls via a flood of call requests.

The vulnerability has been reported in version 1.2.9. Prior versions may also be affected.

NOTE: It has also been reported that malicious people can abuse weakly protected accounts to cause Asterisk to flood a victim with a large number of UDP packets after sending a spoofed packet.


Solution:
Update to version 1.2.10 and use the "maxauthreq" configuration option to limit the number of simultaneous unauthenticated calls.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Tom Cross, ISS X-Force

Original Advisory:
http://xforce.iss.net/xforce/alerts/id/228
http://xforce.iss.net/xforce/alerts/id/229

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Asterisk IAX2 Call Request Flooding Denial of Service

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