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Asterisk Two Denial of Service Vulnerabilities

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Release Date:  2008-07-23    Views:  7,185

Secunia Advisory SA31178

Where:

From local network

Impact:

DoS

Solution Status:

Vendor Patch

CVE Reference(s):

Description


Two vulnerabilities have been reported in Asterisk, which can be exploited by malicious people to cause a DoS (Denial of Service) or to conduct DoS attacks.

1) An error in the processing of IAX2 "POKE" requests can be exploited to consume all IAX2 call numbers via multiple "POKE" requests lacking an "ACK" packet sent in response to a "PONG" packet.

2) The firmware download protocol does not require a handshake, which can be exploited to send packets having 1040 bytes to arbitrary servers via a 40-byte packet with a spoofed source address.

The vulnerabilities are reported in the following products and versions:
* Asterisk Open Source 1.0.x (all versions)
* Asterisk Open Source 1.2.x (all versions prior to 1.2.30)
* Asterisk Open Source 1.4.x (all versions prior to 1.4.21.2)
* Asterisk Business Edition A.x.x (all versions)
* Asterisk Business Edition B.x.x.x (all versions prior to B.2.5.4)
* Asterisk Business Edition C.x.x.x (all versions prior to C.1.10.3)
* AsteriskNOW pre-release (all versions)
* Asterisk Appliance Developer Kit 0.x.x (all versions)
* s800i (Asterisk Appliance) 1.0.x (all versions prior to 1.2.0.1)


Solution:
Asterisk Open Source 1.2.x:

Further details available to Secunia VIM customers

Provided and/or discovered by:
1) The vendor credits Jeremy McNamara.
2) Tilghman Lesher, Digium

Original Advisory:
http://downloads.digium.com/pub/security/AST-2008-010.html
http://downloads.digium.com/pub/security/AST-2008-011.html

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 Two Denial of Service Vulnerabilities

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