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McAfee VirusScan DUNZIP32.dll Buffer Overflow
------------------------------------------------------------------------
SUMMARY
" <http://us.mcafee.com/root/package.asp?pkgid=100&cid=16269> VirusScan -
Always-updated protection against PC viruses. Safeguard your hard drive,
email, attachments and downloads from known and unknown viruses,
mass-mailing worms, Trojans and potentially unwanted programs (PUPs) like
spyware."
McAfee ViruScan anti-virus software is confirmed as affected to a remote
buffer overflow vulnerability in a 3rd-party compression library.
DETAILS
Vulnerable Systems:
* DynaZip library versions 5.00.03 and prior.
The vulnerability is caused due to a boundary error in a 3rd-party
compression library's (DUNZIP32.dll) old, vulnerable version used when
handling packed signature files. InnerMedia DynaZip compression library
mentioned is responsible for virus description file unpacking operations.
This can be exploited to cause a buffer overflow via a specially crafted
signature file. When a specially crafted virus definition package
containing a file with an overly long filename (a file name or files
inside a package) is opened the attacker may be able to execute arbitrary
code on user's system (see VU#582498 reference). Opening of signature file
is an automatic operation of product's SecurityCenter.
The following file was copied to C:\Program Files\McAfee.com\Shared
directory during an installation process when tested:
File name: dunzip32.dll
Time stamp: 8th April, 2005
File version: 3.0.0.14
Description: DynaZIP-32 Multi-Threading UnZIP DLL
Copyright information: Copyright (c) Inner Media, Inc. 1993-1996, All
Rights Reserved.
The following processes use Dunzip32.dll library:
C:\PROGRA~1\McAfee.com\Agent\mcupdmgr.exe (McAfee SecurityCenter Update
Manager v6.x)
C:\PROGRA~1\McAfee.com\Shared\mghtml.exe (McAfee Security HTML Dialog
v4.x)
From US-CERT <http://www.kb.cert.org/vuls/id/582498> VU#582498:
"Impact: If a remote attacker can persuade a user to access a specially
crafted zip file, the attacker may be able to execute arbitrary code on
that user's system possibly with elevated privileges."
Solution:
Vendor has issued a patch shipped with immune library version 5.00.06. It
can be obtained by downloading an updated product version or using
product's SecurityCenter Updates feature.
Non-affected library has the following time stamp: 30th December, 2005.
According to vendor response localized builds has been fixed as well.
Tested non-affected product version: Build 10.0.27
Vendor is reportedly in process to publish FAQ (version release) document
to the McAfee/Network Associates KnowledgeBase
(
<http://knowledgemap.nai.com/KanisaSupportSite/supportcentral/supportcentral.do?id=m1&language=en_US>
http://knowledgemap.nai.com/KanisaSupportSite/supportcentral/supportcentral.do?id=m1&language=en_US).
Workaround:
No working workarounds available.
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1094>
CVE-2004-1094
US-CERT:
<http://www.kb.cert.org/vuls/id/582498> VU#582498
Disclosure Timeline:
* 23-Dec-2005 - Vulnerability researched and confirmed
* 29-Dec-2005 - Vendor was contacted
* 30-Dec-2005 - Vendor's reply
* 11-Jan-2006 - AVERT Labs informs about started version testing process
* 02-Mar-2006 - New contact to the vendor
* 02-Mar-2006 - Vendor's reply, issue was fixed on 24th January, vendor
informs about upcoming FAQ release document
* 27-Mar-2006 - New contact to the vendor asking the state of FAQ release
* 30-Mar-2006 - Security companies and several CERT units contacted
* 30-Mar-2006 - Public disclosure
ADDITIONAL INFORMATION
The information has been provided by <mailto:juha-matti.laurio@netti.fi>
Juha-Matti Laurio.
The original article can be found at:
<http://www.networksecurity.fi/advisories/mcafee-virusscan.html>
http://www.networksecurity.fi/advisories/mcafee-virusscan.html
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