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23 December 2005

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             AUSCERT External Security Bulletin Redistribution

                          ESB-2005.1009 -- [Win]
    McAfee Security Center MCINSCTL.DLL ActiveX Control File Overwrite
                             23 December 2005


        AusCERT Security Bulletin Summary

Product:           McAfee VirusScan
Publisher:         iDEFENSE
Operating System:  Windows
Impact:            Create Arbitrary Files
                   Overwrite Arbitrary Files
Access:            Remote/Unauthenticated
CVE Names:         CVE-2005-3657

Original Bulletin:

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McAfee Security Center MCINSCTL.DLL ActiveX Control File Overwrite

iDefense Security Advisory 12.20.05
December 20, 2005


McAfee VirusScan is an anti-virus software. More information is
available from the vendor website:



Remote exploitation of an access control vulnerability in McAfee
Security Center allows attackers to create or overwrite arbitrary

The vulnerability specifically exists due to a registered ActiveX
control failing to restrict which domains may load the control for
execution. MCINSCTL.DLL as included with McAfee Security Center exports
an object for logging called MCINSTALL.McLog. The McLog object is
designed to allow Security Center to log to a file through the StartLog
and AddLog methods. McAfee fails to restrict the ActiveX control from
being loaded in arbitrary domains. As such, attackers can create a
specially crafted web page utilizing the McLog object to create
arbitrary files. This attack can lead to arbitrary code execution by a
remote attacker.


Successful exploitation of this vulnerability allows attackers to
create or append to arbitrary files. An attacker can write to a startup
folder to execute arbitrary code during the next reboot or logon
session. A user will not be required to authorize the object
instantiation since the object is within a signed ActiveX control. A
typical exploitation scenario would require an attacker to convince a
targeted user to visit a malicious website.

This vulnerability hints at a new class of vulnerabilities that occur
due to developers not using the IObjectSafetySiteLock() API to restrict
domains that can load a particular ActiveX control. Vendors who
distributed third-party ActiveX controls should be sure to use the
IObjectSafetySiteLock() API in their applications.


McAfee Security Center is a component that is distributed with various
McAfee products. The following products have been confirmed to contain
a vulnerable mcinsctl.dll component in their distribution:

• McAfee VirusScan (mcinsctl.dll


iDefense is unaware of any effective workarounds at this time.


"McAfee previously released updates to SecurityCenter that resolve this
issue. All active McAfee SecurityCenter users, by default, should have
automatically received the update, and will now have the fix for this
vulnerability already installed on their computers.

To manually check for updates, users can right-click the McAfee system
tray icon (white M on red background) and select 'Updates'. In the
resulting dialogue box, they should click 'Check Now' to check the
server for updates. The user will be walked through the update process
or be notified that all software is up to date. If a user has not yet
registered, a registration web page or the registration wizard will
pop-up, guiding the user through the update process.

McAfee's key priority is the security of our customers. In the event
that a vulnerability is found within any of McAfee's software, we have a
strong process in place to work closely with the relevant security
research group to ensure the rapid and effective development of a fix
and communication plan."


The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2005-3657 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
security problems.


11/15/2005 Initial vendor notification
11/16/2005 Initial vendor response
12/20/2005 Coordinated public disclosure


iDefense credits Peter Vreugdenhil with the discovery of this

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Copyright © 2005 iDefense, Inc.

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There are no warranties with regard to this information. Neither the
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