From: Secunia Security Advisories (sec-advsecunia.com)
Date: Mon Feb 22 2010 - 20:57:12 CST

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Public Beta of CSI and WSUS Integration
http://secunia.com/blog/74

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TITLE:
Asterisk Dialplan Wildcard Pattern Weakness

SECUNIA ADVISORY ID:
SA38641

VERIFY ADVISORY:
http://secunia.com/advisories/38641/

DESCRIPTION:
A weakness has been reported in Asterisk, which can lead to
unintended configurations.

The problem is that certain wildcard patterns in combination with
e.g. the "${EXTEN}" channel variable in a dialplan can lead to a
configuration that allows passing additional arguments to certain
applications (e.g. "Dial()"). The problem occurs when a channel
technology is used that accepts characters other than numbers and
letters (e.g. SIP).

The weakness is reported in the following products and versions:
* Asterisk Open Source 1.2.x (all versions)
* Asterisk Open Source 1.4.x (all versions)
* Asterisk Open Source 1.6.x (all versions)
* Asterisk Business Edition B.x.x (all versions)
* Asterisk Business Edition C.x.x (all versions)

SOLUTION:
The vendor recommends to check existing configurations and apply
security best practices (please see the vendor's advisory for
details).

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Hans Petter Selasky.

ORIGINAL ADVISORY:
http://downloads.asterisk.org/pub/security/AST-2010-002.html

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