Microsoft IIS /iisadmpwd/aexp2.htr Password Policy Bypass

This script is Copyright (C) 2000-2013 Tenable Network Security, Inc.


Synopsis :

The remote web server is affected by a password policy bypass
vulnerability.

Description :

Microsoft IIS installs the 'aexp2.htr', 'aexp2b.htr', 'aexp3.htr', or
'aexp4.htr' files in the '/iisadmpwd' directory by default. These
fiels can be used by an attacker to brute-force a valid
username/password. A valid user may also use it to change his password
on a locked account, bypassing password policy.

See also :

http://archives.neohapsis.com/archives/bugtraq/2002-03/0049.html

Solution :

Remote the HTR ISAPI filter mapping from IIS and use Microsoft Active
Directory Service Interfaces for handling accounts remotely.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 8.5
(CVSS2#E:U/RL:U/RC:ND)
Public Exploit Available : true

Family: Web Servers

Nessus Plugin ID: 10371 (iis_authentification_manager.nasl)

Bugtraq ID: 2110
4236

CVE ID: CVE-1999-0407
CVE-2002-0421