Rapid7 Vulnerability & Exploit Database

Microsoft IIS 4.0 IISADMPWD Proxied Password Attack

Back to Search

Microsoft IIS 4.0 IISADMPWD Proxied Password Attack

Severity
10
CVSS
(AV:N/AC:L/Au:N/C:C/I:C/A:C)
Published
02/09/1999
Created
07/25/2018
Added
11/01/2004
Modified
12/04/2013

Description

Microsoft IIS is a popular web server package for Windows NT based platforms. Version 4.0 of IIS installs a remotely accessible directory, /IISADMPWD - mapped to c:\winnt\system32\inetsrv\iisadmpwd, which contains a number of vulnerable .HTR files.

These were designed to allow system administrators the ability to provide HTTP based password change services to network users. The affected files, achg.htr, aexp*.htr, and anot*.htr can be used in this manner. A Microsoft bulletin on the feature recommends using /IISADMPWD/aexp.htr for this purpose. Requesting one of the listed .htr files returns a form that requests the account name, current password, and changed password.

This can be used to determine whether or not the account requested exists on the host, as well as conduct brute force attacks. If the account does not exist, the message "invalid domain" is returned - if it does, but the password change was unsuccessful, the attacker is notified.

This be used against the server and against other machines connected to the local network (and possibly even other machines on the internet), by preceding the account name with an IP address and a backslash (e.g., XXX.XXX.XXX.XXX\ACCOUNT). The server contacts the networked machine through the NetBIOS session port and attempts to change the password.

Solution(s)

  • http-iis-0010

With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.

– Scott Cheney, Manager of Information Security, Sierra View Medical Center

;