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Secunia Research 14/06/2006
Internet Explorer Exception Handling Memory Corruption Vulnerability
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Table of Contents
Affected Software....................................................1
Severity.............................................................2
Description of Vulnerability.........................................3
Solution.............................................................4
Time Table...........................................................5
Credits..............................................................6
References...........................................................7
About Secunia........................................................8
Verification.........................................................9
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1) Affected Software
Microsoft Internet Explorer 6.0
Prior versions may also be affected.
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2) Severity
Rating: Highly critical
Impact: System access
Where: From remote
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3) Description of Vulnerability
Secunia Research has discovered a vulnerability in Internet Explorer,
which can be exploited by malicious people to compromise a user's
system.
The vulnerability is caused due to a memory corruption error within
the handling of certain exceptional conditions. This can e.g. be
exploited by registering an exception handler for an object and then
trigger a certain condition via e.g. a certain sequence of nested
"object" HTML tags.
Successful exploitation allows execution of arbitrary code when a
user e.g. visits a malicious web site.
NOTE: This vulnerability is a variant of a browser crash bug
initially reported by Michal Zalewski.
The vulnerability has been confirmed on a fully patched system with
Internet Explorer 6.0 and Microsoft Windows XP SP2 (without MS06-021).
Prior versions may also be affected.
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4) Solution
Apply patches.
Please see MS06-021 (KB916281):
http://www.microsoft.com/technet/security/Bulletin/MS06-021.mspx
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5) Time Table
26/04/2006 - Initial vendor notification.
28/04/2006 - Vendor confirms vulnerability.
14/06/2006 - Public disclosure.
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6) Credits
Discovered by Andreas Sandblad, Secunia Research.
Initial crash bug discovered by:
Michal Zalewski
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7) References
The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2006-2218 for the vulnerability.
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8) About Secunia
Secunia collects, validates, assesses, and writes advisories regarding
all the latest software vulnerabilities disclosed to the public. These
advisories are gathered in a publicly available database at the
Secunia website:
http://secunia.com/
Secunia offers services to our customers enabling them to receive all
relevant vulnerability information to their specific system
configuration.
Secunia offers a FREE mailing list called Secunia Security Advisories:
http://secunia.com/secunia_security_advisories/
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9) Verification
Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2006-41/advisory/
Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/
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