ISS Protection Bried: ie_patch_ms_06-13

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Internet Security Systems Security Brief
April 11, 2006

Cumulative Security Update for Internet Explorer

Summary:
Microsoft has issued a cumulative security update for Internet Explorer.
This update addresses a number of critical issues that could affect IE
users to the extent of remote code execution.

Business Impact:
Compromise of the operating system can lead to exposure of
confidential information, loss of productivity, and further network
compromise. Successful exploitation of this vulnerability could
be used to gain unauthorized access to one.s networks and machines.

Description:

Internet Explorer createTextRange() Remote Code Execution Vulnerability:

This vulnerability allows attackers to invoke the createTextRange() method
on an object that was not intended to handle this operation. Internet
Explorer then attempts to make a call to a predictable location in
memory. This memory location a be preloaded with code the attacker would
like to have executed.

More detail on this vulnerability can be found in the following X-Force Alert:

http://xforce.iss.net/xforce/alerts/id/217

Internet Explorer HTA Download and Execute Vulnerability:

This vulnerability allows attackers to force a victim to download and execute
arbitrary HTA files without the user.s knowledge. Scripts can be embedded
within HTA files and should not be trusted. As such, Internet Explorer normally
prompts users before downloading HTA files. Running a malicious HTA file could
lead to the compromise of sensitive information, download and execution
of additional malicious files, etc.

For the complete ISS X-Force Security Alert, please visit:
http://xforce.iss.net/xforce/alerts/id/220

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About Internet Security Systems, Inc.
Internet Security Systems, Inc. (ISS) is the trusted security advisor to
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preemptive protection for networks, desktops and servers. An established
leader in security since 1994, ISS. integrated security platform
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they impact business assets. ISS products and services are based
on the proactive security intelligence of its X-Force® research and
development team . the unequivocal world authority in vulnerability and
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Copyright (c) 2006 Internet Security Systems, Inc. All rights reserved
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X-Force PGP Key available on MIT's PGP key server and PGP.com's key
server, as well as at http://www.iss.net/security_center/sensitive.php
Please send suggestions, updates, and comments to: X-Force

[email protected] of Internet Security Systems, Inc.

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