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AUSCERT External Security Bulletin Redistribution
ESB-2007.0082 -- [Win][Linux]
Vulnerabilities in Trend Micro AntiVirus scan engine allow
remote compromise
8 February 2007
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AusCERT Security Bulletin Summary
---------------------------------
Product: Trend Micro Antivirus Scan Engine
PC-Cillin Internet Security 2007
ServerProtect for Linux v2.5
Publisher: iDefense
Operating System: Windows
Linux variants
Impact: Administrative Compromise
Denial of Service
Access: Remote/Unauthenticated
Existing Account
Original Bulletin:
http://www.idefense.com/intelligence/vulnerabilities/display.php?id=470
http://www.idefense.com/intelligence/vulnerabilities/display.php?id=469
Comment: Note that there are two iDefense bulletins in this advisory.
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Trend Micro AntiVirus UPX Parsing Kernel Buffer Overflow Vulnerability
iDefense Security Advisory 02.07.07
http://labs.idefense.com/intelligence/vulnerabilities/
Feb 07, 2007
I. BACKGROUND
The Trend Micro AntiVirus scan engine provides anti-virus capabilities to
desktop, server and gateway systems. The engine is licensed to several of
Trend Micro's OEM partners. More information is available on Trend Micro's
web site at the following URL.
http://www.trendmicro.com/
II. DESCRIPTION
Remote exploitation of a buffer overflow vulnerability within Trend Micro's
AntiVirus engine could allow an attacker to crash the scan engine or
execute arbitrary code.
This vulnerability is caused by improper input validation when scanning
specially crafted malformed UPX compressed executables. Memory corruption
could occur leading to a invalid memory access or a potentially
exploitable condition.
III. ANALYSIS
Exploitation allows attackers to crash the scan engine or execute arbitrary
code.
This vulnerability could be used to gain unauthorized access to machines
through common protocols, e.g. SMTP, HTTP, FTP. No authentication is
required for an attacker to leverage this vulnerability.
Under Windows, the scan engine runs in kernel context. Under Linux, the
scan engine runs as a daemon with superuser privileges. As such, an
attacker can take complete control of the affected system if successful
code execution is attained.
IV. DETECTION
iDefense has confirmed the existence of this vulnerability in our
vulnerability lab. The configurations at verification time were as
follows:
* Trend Micro's PC-Cillin Internet Security 2007
* VsapiNI.sys (scan engine) version 3.320.0.1003
* ServerProtect for Linux v2.5 on RHEL 4.x
* vsapiapp version 8.310
Any implementations based on Trend Micro's AntiVirus scan engine are
likely vulnerable in their default configuration.
V. WORKAROUND
iDefense is currently unaware of any effective workaround for this issue.
VI. VENDOR RESPONSE
"To address this vulnerability, Trend Micro recommends customers to update
to Virus Pattern File 4.245.00 or higher."
For more information, consult the Trend Micro Knowledge Base article at
the link shown below.
http://esupport.trendmicro.com/support/viewxml.do?ContentID=EN-1034289
VII. CVE INFORMATION
A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.
VIII. DISCLOSURE TIMELINE
01/17/2007 Initial vendor notification
01/19/2007 Initial vendor response
02/07/2007 Coordinated public disclosure
IX. CREDIT
The discoverer of this vulnerability wishes to remain anonymous.
Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php
Free tools, research and upcoming events
http://labs.idefense.com/
X. LEGAL NOTICES
Copyright © 2006 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 e-mail
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.
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Trend Micro TmComm Local Privilege Escalation Vulnerability
iDefense Security Advisory 02.07.07
http://labs.idefense.com/intelligence/vulnerabilities/
Feb 07, 2007
I. BACKGROUND
The Trend Micro AntiVirus scan engine is widely relied upon to provide
AntiVirus capabilities to desktop, server, and gateway systems. The engine
is licensed to several of Trend Micro's OEM partners. More information is
available on Trend Micro's web site at the following URL.
http://www.trendmicro.com/
II. DESCRIPTION
Local exploitation of an input validation vulnerability within version
1.5.0.1052 of TmComm.sys as included with Trend Micro's AntiVirus engine
could allow an attacker execute arbitrary code in kernel context.
This vulnerability specifically exists due to insecure permissions on the
\\.\TmComm DOS device interface. The permissions on this device allows
"Everyone" write access. This could allow a locally logged in user to
access functionality via IOCTLs which was designed for privileged use
only.
Additionally, the IOCTL handlers for this DOS device interface do not
validate addresses passed to them. As such, it is possible to overwrite
arbitrary memory or execute attacker-supplied code in the context of the
kernel (RING 0).
III. ANALYSIS
Exploitation allows an attacker to elevate privileges by overwriting
arbitrary system memory or executing code within kernel context.
IV. DETECTION
iDefense has confirmed the existence of this vulnerability in our
vulnerability lab. The configuration at verification time was as follows:
* Trend Micro's PC-Cillin Internet Security 2007
* TmComm.sys version 1.5.0.1052
* VsapiNI.sys (scan engine) version 3.320.0.1003
All products using Trend Micro's scan engine should be considered
vulnerable.
V. WORKAROUND
Removing write permissions for "Everyone" appears to prevent access to the
vulnerable code. iDefense confirmed that the virus scanning engine was
still able to detect viruses. Although no side effects were witnessed in
Lab tests, normal functionality may be hindered.
VI. VENDOR RESPONSE
"To address this vulnerability, Trend Micro recommends to customers to
update their Anti-Rootkit Common Module to version 1.600-1052.
Products that are set to Automatic Update will be updated immediately.
Manual Updating can also be performed by using the product's "Update
Now" function."
More information is available in Trend Micro's knowledge base at the link
shown below.
http://esupport.trendmicro.com/support/viewxml.do?ContentID=EN-1034432&id=EN-1034432
VII. CVE INFORMATION
A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.
VIII. DISCLOSURE TIMELINE
01/17/2007 Initial vendor notification
01/19/2007 Initial vendor response
02/07/2007 Coordinated public disclosure
IX. CREDIT
This vulnerability was reported to iDefense by Ruben Santamarta of
reversemode.com.
Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php
Free tools, research and upcoming events
http://labs.idefense.com/
X. LEGAL NOTICES
Copyright © 2006 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 e-mail
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.
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