Test ID:	1.3.6.1.4.1.25623.1.0.900711
Category:	Web Servers
Title:	Microsoft IIS WebDAV Remote Authentication Bypass Vulnerability
Summary:	Microsoft IIS Webserver with WebDAV Module is prone to remote authentication bypass vulnerability.
Description:	Summary: Microsoft IIS Webserver with WebDAV Module is prone to remote authentication bypass vulnerability. Vulnerability Insight: Due to the wrong implementation of UNICODE characters support (WebDAV extension) for Microsoft IIS Server which fails to decode the requested URL properly. Unicode character checks are being done after IIS Server internal security check, which lets the attacker execute any crafted UNICODE character in the HTTP requests to get information on any password protected directories without any authentication schema. Vulnerability Impact: Successful exploitation will let the attacker craft malicious UNICODE characters and send it over the context of IIS Webserver where WebDAV is enabled. As a result due to lack of security implementation check it will let the user fetch password protected directories without any valid authentications. Affected Software/OS: Microsoft Internet Information Services version 5.0 to 6.0. Solution: The vendor has released updates. Please see the references for more information. Workaround: Disable WebDAV or upgrade to Microsoft IIS 7.0. CVSS Score: 7.5 CVSS Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2009-1535 Cert/CC Advisory: TA09-160A http://www.us-cert.gov/cas/techalerts/TA09-160A.html http://archives.neohapsis.com/archives/fulldisclosure/2009-05/0135.html http://archives.neohapsis.com/archives/fulldisclosure/2009-05/0139.html http://archives.neohapsis.com/archives/fulldisclosure/2009-05/0144.html http://archives.neohapsis.com/archives/fulldisclosure/2009-05/att-0135/IIS_Advisory.pdf http://blog.zoller.lu/2009/05/iis-6-webdac-auth-bypass-and-data.html http://isc.sans.org/diary.html?n&storyid=6397 http://view.samurajdata.se/psview.php?id=023287d6&page=1 Microsoft Security Bulletin: MS09-020 https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-020 https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6029 http://www.attrition.org/pipermail/vim/2009-June/002192.html
Copyright	Copyright (C) 2009 Greenbone AG

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