Some vulnerabilities have been reported in Microsoft Internet Explorer, which can be exploited by malicious people to bypass certain security restrictions or compromise a user's system.

1) An error in the handling of cached content can be exploited to bypass domain restrictions and disclose information from the local system or from windows in other domains or Internet Explorer zones via redirects to URIs specified in the Universal Naming Convention (UNC) form.

2) An error when handling calls to DHTML objects can be exploited to corrupt memory and potentially execute arbitrary code.

3) An error when handling a large number of asynchronous "XMLHttpRequest" requests can be exploited to corrupt memory and potentially execute arbitrary code.

4) An error exists when handling "setCapture()" calls issued on a collection of specially crafted objects. This can be exploited to corrupt memory and potentially execute arbitrary code when the capture is released.

5) An error exists when handling repeated calls to event handlers, issued after adding nodes of an HTML document. This can be exploited to dereference freed memory and potentially execute arbitrary code when a specially crafted web page is repeatedly rendered.

6) An error when handling repeated calls to "getElementsByTagName()" can be exploited to corrupt memory and potentially execute arbitrary code by using the "onreadystatechange" event and repeated page rendering to improperly free an allocated object.

7) An error in the processing of malformed HTML row property references can be exploited to dereference a pointer to freed memory and potentially execute arbitrary code.

Solution
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Provided and/or discovered by
1) Jorge Luis Alvarez Medina of Core Security Technologies
2) Haifei Li of Fortinet’s FortiGuard Global Security Research Team
3) an anonymous researcher, reported via ZDI
4) Peter Vreugdenhil, reported via ZDI
5, 6) ling and wushi of team509, reported via ZDI
7) Nils, reported via ZDI

Changelog
Further details available in Customer Area

Original Advisory
Microsoft (KB969897):
http://www.microsoft.com/technet/security/Bulletin/MS09-019.mspx

Core Security Technologies:
http://www.coresecurity.com/content/ie-security-zone-bypass

Fortinet’s FortiGuard Global Security Research Team:
http://www.fortiguardcenter.com/advisory/FGA-2009-22.html

ZDI:
http://www.zerodayinitiative.com/advisories/ZDI-09-036/
http://www.zerodayinitiative.com/advisories/ZDI-09-037/
http://www.zerodayinitiative.com/advisories/ZDI-09-038/
http://www.zerodayinitiative.com/advisories/ZDI-09-039/
http://www.zerodayinitiative.com/advisories/ZDI-09-041/

Deep Links
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