An information vulnerability exists when Microsoft XML Core Services (MSXML) improperly handles objects in memory. Successful exploitation of the vulnerability could allow the attacker to test for the presence of files on disk. To exploit the vulnerability, an attacker could host a specially-crafted website that is designed to invoke MSXML through Internet Explorer. However, an attacker would have no way to force a user to visit such a website. Instead, an attacker would typically have to convince a user to either click a link in an email message or a link in an Instant Messenger request that would then take the user to the website. The update addresses the vulnerability by changing the way MSXML handles objects in memory.
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