Description: Some vulnerabilities have been reported in Internet Explorer, which can be exploited by malicious people to compromise a user's system.
1) A use-after-free error in mshtml.dll when handling "setExpression()" method calls can be exploited to dereference previously freed memory via a malicious web page containing specially crafted script code.
2) An error within the handling of the "cloneNode()" and "nodeValue()" methods can be exploited to corrupt memory via a malicious web page containing specially crafted script code.
3) An error when handling document objects that have been created, modified, deleted, and are then accessed can be exploited to corrupt memory via a malicious web page containing specially crafted script code.
4) An error when displaying web pages containing certain unexpected method calls to HTML objects can be exploited to corrupt memory.
NOTE: This vulnerability is reportedly being actively exploited.
Successful exploitation of the vulnerabilities allows execution of arbitrary code when a user e.g. visits a malicious website.
Do you have this product installed on your home computer? Scan using the free Personal Software Inspector. Check if a vulnerable version is installed on computers in your corporate network, using the Network Software Inspector.
Provided and/or discovered by: 1) Independently discovered by:
* An anonymous person via ZDI.
* Peter Vreugdenhil via iDefense VCP.
2) Reported by Sam Thomas via Zero Day Initiative.
3) Reported by Peter Vreugdenhil via Zero Day Initiative.
4) Reported as a 0-day.
Changelog: 2007-12-12: Added information from ZDI.
2007-12-13: Added link to iDefense Labs.
2007-12-19: Updated "Extended Solution" section.
Extended Solution: The "Extended Solution" section is available for Secunia customers only. Request a trial and get access to the Secunia Customer Area and Extended Secunia advisories.
Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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