Technical Description

Multiple vulnerabilities have been identified in Microsoft Internet Explorer, which could be exploited by remote attackers to take complete control of an affected system.

The first issue is caused by a memory corruption error when the browser instantiates certain COM objects, which could be exploited by remote attackers to execute arbitrary code by tricking a user into visiting a specially crafted web page.

The second vulnerability is caused by a memory corruption error when parsing a specially crafted CSS tag, which could be exploited by remote attackers to compromise a vulnerable system by tricking a user into visiting a specially crafted web page.

The third issue is caused by a race condition when installing multiple language packs, which could be exploited by remote attackers to execute arbitrary code by tricking a user into visiting a specially crafted web page.

The fourth vulnerability is caused by a memory corruption error when accessing an object which has not been initialized or has been deleted, which could be exploited by remote attackers to compromise a vulnerable system by tricking a user into visiting a specially crafted web page.

The fifth issue is caused by a memory corruption error in a component of Microsoft Speech API 4, which could be exploited by remote attackers to execute arbitrary code by tricking a user into visiting a specially crafted web page.

The sixth issue is caused by an error within the handling of the navigation cancel page, which could be exploited by malicious web sites to conduct spoofing attacks. For additional information, see : VUPEN/ADV-2007-2064

Affected Products

Microsoft Internet Explorer 5.01
Microsoft Internet Explorer 6 Service Pack 1
Microsoft Internet Explorer 6 Service Pack 2
Microsoft Internet Explorer 7

Solution

Apply patches :
http://www.microsoft.com/technet/security/Bulletin/MS07-033.mspx

References

http://www.vupen.com/english/advisories/2007/2153
http://www.microsoft.com/technet/security/Bulletin/MS07-033.mspx

Credits

Vulnerabilities reported by iDefense Labs, Tom Cross (ISS), ZDI, Sam Thomas, Will Dorman (CERT/CC) and cocoruder (Fortinet Security Research).

ChangeLog

2007-06-12 : Initial release

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