Operating System:

Published:

16 December 2004

Protect yourself against future threats.

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

===========================================================================
             AUSCERT External Security Bulletin Redistribution

           ESB-2004.0780 -- iDEFENSE Security Advisory 12.15.04
           Computer Associates eTrust EZ Antivirus Insecure File
                         Permission Vulnerability
                             16 December 2004

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Computer Associates eTrust EZ Antivirus 7.0.4 and prior
Publisher:         iDEFENSE
Operating System:  Windows
Impact:            Execute Arbitrary Code/Commands
                   Increased Privileges
Access:            Existing Account
CVE Names:         CAN-2004-1149

Original Bulletin: http://www.idefense.com/application/poi/display?id=164

- --------------------------BEGIN INCLUDED TEXT--------------------

Computer Associates eTrust EZ Antivirus Insecure File Permission
Vulnerability

iDEFENSE Security Advisory 12.15.04
http://www.idefense.com/application/poi/display?id=164
December 15, 2004

I. BACKGROUND

Computer Associates eTrust EZ Antivirus is antivirus protection software 
for home and business use. It provides complete protection, detection 
and elimination of thousands of computer viruses, worms, and Trojan 
Horse programs.

II. DESCRIPTION

Local exploitation of an insecure permission vulnerability in Computer
Associates eTrust EZ Antivirus allows attackers to escalate privileges
or disable protection.

Computer Associates eTrust EZ Antivirus is a product used to protect a
personal computer from virus infections. The vulnerability specifically 
exists in the default file Access Control List (ACL) settings that are 
applied during installation. When an administrator installs eTrust EZ 
Antivirus, the default ACL allows any user to modify the installed 
files. Because of the fact that some of the programs run as system 
services, a user can simply replace an installed eTrust EZ Antivirus 
file with their own malicious code that will later be executed with 
system privileges. One such file that would be a target for this is 
VetMsg.exe.

III. ANALYSIS

Successful exploitation allows local attackers to escalate privileges to 
the system level. It is also possible to use this vulnerability to 
simply disable protection by moving all of the executable files so that 
they cannot start upon a reboot.

IV. DETECTION

iDEFENSE has confirmed the existence of this vulnerability in eTrust EZ 
Antivirus version 7.0.1.4. According to Computer Associates, eTrust EZ
Antivirus r7.0.0 - r7.0.4 installed on PC's running Windows NT, 2000 or
XP and with NTFS formatted drives are also affected.

V. WORKAROUND

Apply proper Access Control List settings to the directory that eTrust 
EZ Antivirus is installed in. The ACL rules should make sure that no 
regular users can modify files in the directory.

VI. VENDOR RESPONSE

"With the assistance of iDEFENSE, Computer Associates has identified a
medium-risk vulnerability in the installation and updating components of
eTrustTM EZ Antivirus which may allow a local user to escalate their
user privileges on a PC and disable protection.

Effected generally available releases of eTrust EZ Antivirus include:
eTrust EZ Antivirus r7.0.0 - r7.0.4 installed on PC's
 - running Windows NT, 2000 or XP
 - with NTFS formatted drives

Computer Associates has actively addressed this issue in eTrust EZ
Antivirus r7.0.5 and above.

More information about this vulnerability and instructions on how to
upgrade to the latest version of eTrust EZ Antivirus can be found at:

http://crm.my-etrust.com/login.asp?username=guest&target=DOCUMENT&openparameter=2222

At Computer Associates, we take every report of exposure with the utmost
urgency, to ensure that no customer is left in a vulnerable situation. 
We have assigned this vulnerability the ID number 32054."

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
names CAN-2004-1149 to these issues. This is a candidate for inclusion
in the CVE list (http://cve.mitre.org), which standardizes names for
security problems.

VIII. DISCLOSURE TIMELINE

10/26/2004  Initial vendor notification
10/29/2004  Initial vendor response
12/15/2004  Coordinated public disclosure

IX. CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

Get paid for vulnerability research
http://www.idefense.com/poi/teams/vcp.jsp

X. LEGAL NOTICES

Copyright © 2004 iDEFENSE, Inc.

Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDEFENSE. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically, please
email customerservice@idefense.com for permission.

Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct, indirect,
or consequential loss or damage arising from use of, or reliance on,
this information.



- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        http://www.auscert.org.au/render.html?cid=1980

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================

-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967

iQCVAwUBQcDp+Sh9+71yA2DNAQLPKgP9ETFoX+f/GkEkgC4G14BClOrRrPFbvvrL
O2mPDS27d7Mwzjx/SEuN/YvyZyEUzn88ZDifOGc4/DY/aaNxd3GZdRDjSG4RqhP0
rrJrnXu0u9PdT7qyUHgNn3fBOyhjSX4fVcrDjmuAV9BP4njcG41NnG1R3o8hdcbR
2NfAN+woLlE=
=gp+M
-----END PGP SIGNATURE-----