Implementation Flaw with Microsoft WebDAV

Reported April 18, 2001, by Microsoft.



  • Microsoft Windows 2000, Windows NT, Windows Me, and Windows 9x



A flaw with Microsoft’s implementation of WWW Distributed Authoring and Versioning (WebDAV) runs the script under the user’s security context. WebDAV should make a distinction between a user's request and script that a Web Browser runs, but Microsoft WebDAV does not differentiate the two. An attacker can use this flaw to browse the user’s intranet or access Web-based email if the attacker knows certain variables, such as server names, folder structures, and specific user and network information.





Microsoft has issued security bulletin MS01-022 to address this vulnerability, and has also issued a hotfix that changes the WebDAV implementation to correctly process these scripts.



Discovered by Microsoft.

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