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Moderately critical

Asterisk Two Denial of Service Vulnerabilities

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Release Date:  2011-03-17    Last Update:  2011-04-01    Views:  1,862

Secunia Advisory SA43722

Where:

From remote

Impact:

DoS

Solution Status:

Vendor Patch

Software:

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).

1) The Asterisk Manager Interface does not properly handle failed writes to manager clients, which can be exploited to cause a CPU and memory exhaustion by opening, sending invalid data, and closing multiple connections in a short period of time.

Successful exploitation requires that the manager interface is enabled (disabled by default).

2) A NULL pointer dereference error within the "handle_tcptls_connection()" function in main/tcptls.c can be exploited to cause a crash by opening multiple connections to services using the "ast_tcptls_*" API (e.g. chan_sip, manager, and res_phoneprov) in a short period of time.

The vulnerabilities are reported in Asterisk Open Source versions 1.6.1.x prior to 1.6.1.23, 1.6.2.x prior to 1.6.2.17.1, and 1.8.x prior to 1.8.3.1.


Solution:
Update to versions 1.6.1.23, 1.6.2.17.1, or 1.8.3.1 or apply patches.

Further details available to Secunia VIM customers

Provided and/or discovered by:
The vendor credits:
1) Blake Cornell
2) Blake Cornell and Chris Maj

Original Advisory:
http://downloads.asterisk.org/pub/security/AST-2011-003.html
http://downloads.asterisk.org/pub/security/AST-2011-004.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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