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Moderately critical

Asterisk Security Bypass and Denial of Service Vulnerabilities

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Release Date:  2011-04-22    Last Update:  2011-04-27    Views:  2,812

Secunia Advisory SA44197

Where:

From remote

Impact:

Security Bypass, DoS

Solution Status:

Vendor Patch

CVE Reference(s):

Description


Two vulnerabilities have been reported in Asterisk, which can be exploited by malicious users to bypass certain security restrictions and by malicious people to cause a DoS (Denial of Service).

1) The application does not properly limit the number of simultaneous TCP connections to e.g. the Asterisk Manager Interface, Skinny, SIP over TCP, or the built in HTTP server, which can be exploited to exhaust all available file descriptors and stop Asterisk from processing new calls.

2) An error within the Asterisk Manager Interface when handling "Originate" actions can be exploited to bypass a certain security check and execute arbitrary shell commands by sending an "Originate" action with both the "Async" and "Application" headers.

Successful exploitation requires that the attacker is an authenticated manager user.

The vulnerabilities are reported in Asterisk Open Source prior to versions 1.4.40.1, 1.6.1.25, 1.6.2.17.3, and 1.8.3.3 and Asterisk Business Edition prior to version C.3.6.4


Solution:
Update to a fixed version or apply patches. Set limits for unauthenticated connections.

Further details available to Secunia VIM customers

Provided and/or discovered by:
The vendor credits:
1) Tzafrir Cohen
2) Mark Murawski

Original Advisory:
http://downloads.asterisk.org/pub/security/AST-2011-005.html
http://downloads.asterisk.org/pub/security/AST-2011-006.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 Security Bypass and Denial of Service Vulnerabilities

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