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Asterisk IAX2 Call Request Flooding Denial of Service Advisory Available in Danish 

Secunia Advisory: SA21071  
Release Date: 2006-07-17

Critical:
Less critical
Impact: DoS
Where: From local network
Solution Status: Vendor Patch

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



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.

29 Related Secunia Security Advisories, displaying 10

1. Asterisk Two Denial of Service Vulnerabilities
2. Asterisk "pedantic" SIP Processing Denial of Service
3. Asterisk IAX2 Handshake Denial of Service
4. Asterisk Predictable HTTP Manager ID Weakness
5. Asterisk Multiple Vulnerabilities
6. Asterisk "BYE/Also" Denial of Service Vulnerability
7. Asterisk Registration Database Security Bypass
8. Asterisk Postgres Realtime Engine SQL Injection
9. Asterisk Call Detail Record Postgres SQL Injection
10. Asterisk IMAP Storage Voicemail Buffer Overflow

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