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Highlights from the 2008 report:
 * Vulnerability Research
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Secunia


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TITLE:
Asterisk SIP Response User Enumeration Weakness

SECUNIA ADVISORY ID:
SA34564

VERIFY ADVISORY:
http://secunia.com/advisories/34564/

DESCRIPTION:
A weakness has been reported in Asterisk, which can be exploited by
malicious people to determine valid user names.

The weakness is caused due to Asterisk returning different responses
when rejecting INVITE or REGISTER requests depending on whether or
not a valid user name is supplied. This can be exploited to enumerate
valid user names.

The weakness is reported in the following products and versions:
* Asterisk Open Source 1.2.x versions prior to 1.2.32
* Asterisk Open Source 1.4.x versions prior to 1.4.24.1
* Asterisk Open Source 1.6.0.x versions prior to 1.6.0.8
* Asterisk Business Edition A.x.x all versions
* Asterisk Business Edition B.x.x versions prior to B.2.5.8
* Asterisk Business Edition C.1.x.x versions prior to C.1.10.5
* Asterisk Business Edition C.2.x.x versions prior to C.2.3.3
* s800i (Asterisk Appliance) 1.3.x versions prior to 1.3.0.2

SOLUTION:
Asterisk Open Source:
Update to version 1.2.32, 1.4.24.1, or 1.6.0.8 or apply patches.
http://downloads.digium.com/pub/asa/AST-2009-003-1.2.diff.txt
http://downloads.digium.com/pub/asa/AST-2009-003-1.4.diff.txt
http://downloads.digium.com/pub/asa/AST-2009-003-1.6.0.diff.txt
http://downloads.digium.com/pub/asa/AST-2009-003-1.6.1.diff.txt

Asterisk Business Edition:
Update to version B.2.5.8, C.1.10.5, or C.2.3.3.

s800i (Asterisk Appliance):
Update to version 1.3.0.2.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Kerin Millar and Fergal Glynn.

ORIGINAL ADVISORY:
http://downloads.digium.com/pub/security/AST-2009-003.html

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