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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://<Target 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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