From: Secunia Security Advisories (sec-advsecunia.com)
Date: Thu Nov 05 2009 - 16:57:10 CST

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TITLE:
Asterisk SIP REGISTER Response User Enumeration Weakness

SECUNIA ADVISORY ID:
SA37265

VERIFY ADVISORY:
http://secunia.com/advisories/37265/

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

The problem is that different responses are being sent when using a
valid or an invalid username in REGISTER messages. This can be
exploited to determine valid usernames by sending specially crafted
REGISTER messages.

SOLUTION:
Asterisk Open Source:
Update to version 1.2.35, 1.4.26.3, 1.6.0.17, or 1.6.19 or apply
patches.
http://downloads.digium.com/pub/asa/AST-2009-008-1.2.diff.txt
http://downloads.digium.com/pub/asa/AST-2009-008-1.4.diff.txt
http://downloads.digium.com/pub/asa/AST-2009-008-1.6.0.diff.txt
http://downloads.digium.com/pub/asa/AST-2009-008-1.6.1.diff.txt

Asterisk Business Edition:
Update to version B.2.5.12, C.2.4.5, or C.3.2.2.

S800i (Asterisk Appliance):
Update to version 1.3.0.5.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Patrik Karlsson.

ORIGINAL ADVISORY:
http://downloads.asterisk.org/pub/security/AST-2009-008.html

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