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Insecure Library Loading
Highly critical

Asterisk T.38 SDP Buffer Overflows and Management Interface Denial of Service

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Release Date:  2007-04-25    Last Update:  2007-04-30    Views:  15,260

Secunia Advisory SA24977

Where:

From remote

Impact:

DoS, System access

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


Some vulnerabilities have been reported in Asterisk, which potentially can be exploited by malicious people to cause a DoS (Denial of Service) or compromise a vulnerable system.

1) Two boundary errors exist in the T.38 SDP parser of the SIP channel when processing the "T38FaxRateManagement" or "T38FaxUdpEC" SDP parameters within the "process_sdp()" function in chan_sip.c. This can be exploited to cause stack-based buffer overflows by sending a specially crafted SIP packet with overly long SDP parameters.

Successful exploitation requires that the "t38_udptl" configuration option is set to "yes".

The vulnerabilities is reported in the 1.4.x branch prior to version 1.4.3.

2) A NULL pointer dereference error exists within the authentication mechanism of the Asterisk Remote Management Interface, which can be exploited to crash the service.

Successful exploitation requires that the Management Interface is enabled and a user without a password is configured in the manager.conf file.

The vulnerability is reported in the 1.2.x branch before 1.2.18 and the 1.4.x branch before 1.4.3.


Solution:
Update to version 1.4.3.

Provided and/or discovered by:
1) Barrie Dempster, NGS Software
2) Reported by Digium Technical Support

Original Advisory:
http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053969.html
http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053968.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 T.38 SDP Buffer Overflows and Management Interface Denial of Service

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