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TITLE:
Asterisk User Account Enumeration Weakness

SECUNIA ADVISORY ID:
SA33453

VERIFY ADVISORY:
http://secunia.com/advisories/33453/

CRITICAL:
Not critical

IMPACT:
Exposure of system information

WHERE:
>From local network

SOFTWARE:
Asterisk 1.x
http://secunia.com/advisories/product/2155/
Asterisk Business Edition 2.x
http://secunia.com/advisories/product/14820/

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

The problem is that different responses are returned depending on
whether a login attempt is performed with an invalid user name as
opposed to when only the password incorrect.

This weakness is reported in the following versions:
- Asterisk Open Source versions prior to 1.2.31
- Asterisk Open Source versions prior to 1.4.23-rc4
- Asterisk Open Source versions prior to 1.6.0.3-rc2
- Asterisk Business Edition (release series A.x.x) all versions
- Asterisk Business Edition versions prior to B.2.5.7
- Asterisk Business Edition versions prior to C.1.10.4
- Asterisk Business Edition versions prior to C.2.1.2.1
- s800i (Asterisk Appliance) versions prior to 1.3.0

SOLUTION:
Update to the fixed versions:
- Asterisk Open Source 1.2.31
- Asterisk Open Source 1.4.22.1
- Asterisk Open Source 1.6.0.3
- Asterisk Business Edition B.2.5.7
- Asterisk Business Edition C.1.10.4
- Asterisk Business Edition C.2.1.2.1
- s800i (Asterisk Appliance) 1.3.0

PROVIDED AND/OR DISCOVERED BY:
The vendor credits www.unprotectedhex.com.

ORIGINAL ADVISORY:
AST-2009-001:
http://downloads.digium.com/pub/security/AST-2009-001.html

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