Trend Micro PC-Cillin Internet Security Insecure File Permission Vulnerability iDefense Security Advisory 12.14.05 www.idefense.com/application/poi/display?id=351&type=vulnerabilities December 14, 2005 I. BACKGROUND 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. II. DESCRIPTION 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. 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. Once disabled, the products are no longer able to provide threat mitigation, thus opening the machine up to attack. IV. DETECTION 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. V. WORKAROUND 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. VI. VENDOR RESPONSE "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. And 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 program." VII. CVE INFORMATION 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 (http://cve.mitre.org), which standardizes names for security problems. VIII. DISCLOSURE TIMELINE 10/27/2005 Initial vendor notification 10/27/2005 Initial vendor response 12/14/2005 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 © 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@private 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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