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Category:   Application (Security)  >   McAfee VirusScan ASaP Vendors:   McAfee
McAfee VirusScan ASaP Lets Remote Users View Contents of Files on the Host
SecurityTracker Alert ID:  1001980
SecurityTracker URL:
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jul 12 2001
Impact:   Disclosure of system information, Disclosure of user information
Exploit Included:  Yes  
Version(s): tested on NT Workstation 4.0, 2000 Professional
Description:   McAfee's VirusScan ASaP anti-virus software for Windows reportedly contains a vulnerability that allows remote users to access and view files on the host.

VirusScan ASaP reportedly uses peer-to-peer agent technology (called Rumor Technology) to distribute antivirus definitions from host to host. This agent software apparently includes a web server listening on port 6515 and designed to only serve files that are located in the \winnt\mycio\agent\rmrcache directory. The vulnerability allows remote users to use a specially crafted HTTP URL to obtain files located outside of the directory on the same drive that the anti-virus software is installed on. Because the web service runs in the Local system context, all files on the drive can be viewed.

For example, the following type of URL can be used:


The vendor has reportedly been notified.

Impact:   A remote user can obtain any files located on the same drive that the anti-virus software is installed on.
Solution:   No solution was available at the time of this entry.
Vendor URL: (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Windows (Me), Windows (NT), Windows (95), Windows (98), Windows (2000)

Message History:   This archive entry has one or more follow-up message(s) listed below.
(Vendor Releases Fix) Re: McAfee VirusScan ASaP Lets Remote Users View Contents of Files on the Host
The vendor has released a fix.

 Source Message Contents

Subject:  McAfee ASaP Virusscan - myCIO HTTP Server Directory Traversal Vulnerabilty

Content-type: text/plain

----- Begin Hush Signed Message from -----

                                -=[ 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 


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.  


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.


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

HTTP://<Target IP Address>:6515/.../.../.../.../winnt/repair


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


McAfee where notified of this issue 28-June-2001

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