This is a cumulative patch for Internet Explorer 5.5 and 6.0. In addition to including the functionality of all previously released patches for Internet Explorer 5.5 and 6.0, it also eliminates a newly discovered flaw in Internet Explorer's cross-domain security model. This flaw occurs because the security checks that Internet Explorer carries out when particular object caching techniques are used in web pages are incomplete. This could have the effect of allowing a website in one domain to access information in another, including the user’s local system.
Exploiting the vulnerability could enable an attacker to read, but not change, any file on the user’s local computer. In addition, the attacker could invoke an executable that was already present on the local system. The attacker would need to know the exact location of the executable, and would not be able to pass parameters to it. Microsoft is not aware of any executable that ships by default as part of Windows and, when run without parameters, could be dangerous.
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