Vulnerability CVE-2009-0041
Published: 2009-01-14   Modified: 2012-02-13

Description:
IAX2 in Asterisk Open Source 1.2.x before 1.2.31, 1.4.x before 1.4.23-rc4, and 1.6.x before 1.6.0.3-rc2; Business Edition A.x.x, B.x.x before B.2.5.7, C.1.x.x before C.1.10.4, and C.2.x.x before C.2.1.2.1; and s800i 1.2.x before 1.3.0 responds differently to a failed login attempt depending on whether the user account exists, which allows remote attackers to enumerate valid usernames.

See advisories in our WLB2 database:
Topic
Author
Date
Med.
Information leak in IAX2 authentication
Asterisk Securit...
09.01.2009

Type:

CWE-200

 (Information Exposure)

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Asterisk -> Asterisk business edition 
Asterisk -> Open source 
Asterisk -> S800i appliance 

 References:
http://downloads.digium.com/pub/security/AST-2009-001.html
http://security.gentoo.org/glsa/glsa-200905-01.xml
http://securityreason.com/securityalert/4910
http://www.debian.org/security/2009/dsa-1952
http://www.securityfocus.com/archive/1/499884/100/0/threaded
http://www.securityfocus.com/bid/33174
http://www.securitytracker.com/id?1021549
http://www.vupen.com/english/advisories/2009/0063
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