====================================================================== Secunia Research 14/06/2006
Internet Explorer Exception Handling Memory Corruption Vulnerability ====================================================================== 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 ====================================================================== 1) Affected Software Microsoft Internet Explorer 6.0 Prior versions may also be affected. ====================================================================== 2) Severity Rating: Highly critical Impact: System access Where: From remote ====================================================================== 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. ====================================================================== 4) Solution Apply patches. Please see MS06-021 (KB916281): http://www.microsoft.com/technet/security/Bulletin/MS06-021.mspx ====================================================================== 5) Time Table 26/04/2006 - Initial vendor notification. 28/04/2006 - Vendor confirms vulnerability. 14/06/2006 - Public disclosure. ====================================================================== 6) Credits Discovered by Andreas Sandblad, Secunia Research. Initial crash bug discovered by: Michal Zalewski ====================================================================== 7) References The Common Vulnerabilities and Exposures (CVE) project has assigned CVE-2006-2218 for the vulnerability. ====================================================================== 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/ ====================================================================== 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/ ======================================================================