WebDAV 'ScStoragePathFromUrl' Remote Buffer Overflow

Rejah Rehim

Published on

16 Jun 2021

Vulnerability

CVE-2017-7269 is a Buffer Overflow vulnerability in the Microsoft Internet Information Service (IIS) 6.0 web server, a part of Windows Server 2003 R2. This vulnerability is found in the ScStoragePathFromUrl function in the WebDAV service of the webserver which allows attackers to implement Remote Code Execution or cause Denial-of-Service.The exploitation is done using the long string value that begins with If: <http:// in the PROPFIND HTTP header request. PROPFIND is an HTTP method that is supported by WebDAV protocol. Web Distributed Authoring and Versioning(WebDAV) protocol is an extension of HTTP protocol that provides a framework for managing documents on web servers.

Mitigation / Precaution

In order to patch this vulnerability, please install the official patch Microsoft made available for supported, vulnerable instances.
If upgrading is not practical, consider disabling WebDAV in IIS 6.0.

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