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Asterisk IAX2 Call Request Flooding Denial of Service
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Secunia Advisory:
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SA21071
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Release Date:
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2006-07-17
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Critical:
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Less critical
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Impact:
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DoS
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Where:
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From local network
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Solution Status:
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Vendor Patch
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| Software: | Asterisk 1.x
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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.
Ensure that all user accounts have a strong password.
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
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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