Multiple vulnerabilities have been reported in Asterisk and Asterisk Business Edition, which can be exploited by malicious users to cause a DoS (Denial of Service), bypass certain security restrictions, and compromise a vulnerable system.

1) An error within the Asterisk Manager Interface when handling "originate" actions in the MixMonitor application or the "GetVar" or "Status" manager actions with the "SHELL" and "EVAL" functions does not properly restrict access and can be exploited to execute arbitrary shell commands.

This vulnerability is reported in Asterisk versions 1.6.2.x prior to 1.6.2.24, 1.8.x prior to 1.8.11.1, and 10.x prior to 10.3.1 and Asterisk Business Edition versions 3.x prior to 3.7.4.

2) A boundary error within the Skinny channel driver when handling KEYPAD_BUTTON_MESSAGE events can be exploited to cause a heap-based buffer overflow via specially crafted KEYPAD_BUTTON_MESSAGE events.

Successful exploitation of this vulnerability may allow execution of code.

This vulnerability is reported in Asterisk versions 1.6.2.x prior to 1.6.2.24, 1.8.x prior to 1.8.11.1, and 10.x prior to 10.3.1.

3) An error within the SIP channel driver can be exploited to cause a crash via specially crafted SIP UPDATE requests.

Successful exploitation of this vulnerability requires that the "trustrpid" setting is set to "True".

This vulnerability is reported in Asterisk versions 1.8.x prior to 1.8.11.1 and 10.x prior to 10.3.1 and Asterisk Business Edition versions 3.x prior to 3.7.4.

Solution
Update to a fixed version.
Further details available to Secunia VIM customers

Provided and/or discovered by
The vendor credits:
1) David Woolley.
2) Russell Bryant.
3) Thomas Arimont.

Original Advisory
http://downloads.asterisk.org/pub/security/AST-2012-004.html
http://downloads.asterisk.org/pub/security/AST-2012-005.html
http://downloads.asterisk.org/pub/security/AST-2012-006.html

Deep Links
Links available to Secunia VIM customers