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National Cyber Alert System
Technical Cyber Security Alert TA06-270A
Microsoft Internet Explorer WebViewFolderIcon ActiveX Vulnerability
Original release date: September 27, 2006
Last revised: --
Source: US-CERT
Systems Affected
* Microsoft Windows
* Microsoft Internet Explorer
Overview
The Microsoft Windows WebViewFolderIcon ActiveX control contains an
integer overflow vulnerability that could allow a remote attacker
to execute arbitrary code.
I. Description
The Microsoft Windows WebViewFolderIcon ActiveX control contains an
integer overflow vulnerability. An attacker could exploit this
vulnerability through Microsoft Internet Explorer (IE) or any other
application that hosts the WebViewFolderIcon control. More
information is available in Vulnerability Note VU#753044.
Exploit code for this vulnerability is publicly available.
II. Impact
By convincing a user to open a specially crafted HTML document,
such as a web page or HTML email message, a remote attacker could
execute arbitrary code with the privileges of the user who is
running the program that hosts the WebViewFolderIcon control.
III. Solution
Microsoft has not released an update for this
vulnerability. Consider the following workarounds and best
practices:
Disable the WebViewFolderIcon ActiveX control
To protect against this specific vulnerability, disable the
WebViewFolderIcon control by setting the kill bit for the
following CLSID:
{844F4806-E8A8-11d2-9652-00C04FC30871}
More information about how to set the kill bit is available in
Microsoft Support Document 240797.
Disable ActiveX
To protect against this and other ActiveX and COM
vulnerabilities, disable ActiveX in the Internet Zone and any
other zone that might be used by an attacker. Instructions for
disabling ActiveX in the Internet Zone can be found in the
"Securing Your Web Browser" document and the Malicious Web
Scripts FAQ.
Render email as plain text
To protect against this and other vulnerabilities that require a
victim to load a malicious HTML document, configure email clients
to render email as plain text.
Do not follow unsolicited links
To protect against this and other vulnerabilities that require a
victim to load a malicious HTML document, do not follow
unsolicited or untrusted links.
In order to convince users to visit their sites, attackers often
use URL encoding, IP address variations, long URLs, intentional
misspellings, and other techniques to create misleading links. Do
not click on unsolicited links received in email, instant
messages (IMs), web forums, or internet relay chat (IRC)
channels. Type URLs directly into the browser to avoid these
misleading links. While these are generally good security
practices, following these behaviors will not prevent
exploitation of this vulnerability in all cases, particularly if
a trusted site has been compromised or allows cross-site
scripting.
IV. References
* Vulnerability Note VU#753044 -
<http://www.kb.cert.org/vuls/id/753044>
* Securing Your Web Browser -
<http://www.us-cert.gov/reading_room/securing_browser/>
* Malicious Web Scripts FAQ -
<http://www.cert.org/tech_tips/malicious_code_FAQ.html>
* CVE-2006-3730 -
<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-3730>
* Microsoft Support Document 240797 -
<http://support.microsoft.com/kb/240797>
____________________________________________________________________
The most recent version of this document can be found at:
<http://www.us-cert.gov/cas/techalerts/TA06-270A.html>
____________________________________________________________________
Feedback can be directed to US-CERT Technical Staff. Please send
email to <cert@xxxxxxxx> with "TA06-270A Feedback VU#753044" in the
subject.
____________________________________________________________________
For instructions on subscribing to or unsubscribing from this
mailing list, visit <http://www.us-cert.gov/cas/signup.html>.
____________________________________________________________________
Produced 2006 by US-CERT, a government organization.
Terms of use:
<http://www.us-cert.gov/legal.html>
____________________________________________________________________
Revision History
September 27, 2006: Initial release
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