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Test ID:1.3.6.1.4.1.25623.1.0.900293
Category:General
Title:Asterisk SIP REGISTER Response Username Enumeration Vulnerability
Summary:This host is running Asterisk Server and is prone to username; enumeration vulnerability.
Description:Summary:
This host is running Asterisk Server and is prone to username
enumeration vulnerability.

Vulnerability Insight:
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.

Vulnerability Impact:
Successful exploitation will allow attacker to obtain valid username that
could aid in further attacks.

Affected Software/OS:
Asterisk Business Edition C.3.x
Asterisk Open Source Version 1.4.x, 1.6.2.x, 1.8.x

Solution:
Updates are available. Please see the referenced AST advisory for more information.

CVSS Score:
5.0

CVSS Vector:
AV:N/AC:L/Au:N/C:P/I:N/A:N

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2011-2536
http://www.securitytracker.com/id?1025734
CopyrightCopyright (C) 2011 Greenbone Networks GmbH

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