Vulnerability CVE-2009-3727
Published: 2009-11-10   Modified: 2012-02-13

Description:
Asterisk Open Source 1.2.x before 1.2.35, 1.4.x before 1.4.26.3, 1.6.0.x before 1.6.0.17, and 1.6.1.x before 1.6.1.9; Business Edition A.x.x, B.x.x before B.2.5.12, C.2.x.x before C.2.4.5, and C.3.x.x before C.3.2.2; AsteriskNOW 1.5; and s800i 1.3.x before 1.3.0.5 generate different error messages depending on whether a SIP username is valid, which allows remote attackers to enumerate valid usernames via multiple crafted REGISTER messages with inconsistent usernames in the URI in the To header and the Digest in the Authorization header.

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
Digium -> Asterisk 
Digium -> Asterisknow 
Digium -> S800i 

 References:
http://www.securityfocus.com/bid/36924
https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00838.html
https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00789.html
https://bugzilla.redhat.com/show_bug.cgi?id=533137
https://bugzilla.redhat.com/show_bug.cgi?id=523277
http://www.securitytracker.com/id?1023133
http://www.debian.org/security/2009/dsa-1952
http://secunia.com/advisories/37677
http://secunia.com/advisories/37479
http://secunia.com/advisories/37265
http://osvdb.org/59697
http://downloads.asterisk.org/pub/security/AST-2009-008.html
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