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                                -=[ SECURITY ADVISORY ]=-

                McAfee ASaP Virusscan - myCIO HTTP Server Directory Traversal Vulnerabilty

Date: 28 June 2001

Impact: HIGH

Affected: Any machine running the McAfee Agent ASaP VirusScan Software

Tested on: NT Workstation 4.0, 2000 Professional

Overview
--------

McAfee ASap Virusscan is a Web-based, managed and updated Anti-Virus Service
for the Desktop Environment. On setup agent software is installed on the
client machine. This software incorporates what is known as "Rumour Technology"
that facilitates in the transfer of virus definitions between neigbouring
machines. This agent software runs as a service ("McAfee Agent") under
the local system account and uses a light weight HTTP server that listens
on port 6515.

Description
-----------

This web server is restricted to serve files that are located under \winnt\mycio\agent\rmrcache
, however it is possible to break out of this by using a specially formatted
directory traversal URL. This means that an attacker can connect to the
webserver and view and/or download any file that resides on the target box.
 Due to the fact that the service is running as local system NTFS permissions
are redundant.

Example
-------

To view the contents of WinNT/Repair enter the following URL into a web
browser:

http:// IP Address>:6515/.../.../.../.../winnt/repair

Workaround
----------

Disable the McAfee Agent service or alternatively run it under a local user
account and set the NTFS permissions accordingly.

Notes
-----

McAfee where notified of this issue 28-June-2001

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