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Moderately critical

Microsoft Internet Information Services WebDAV Security Bypass Vulnerabilities

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Release Date:  2009-05-18    Last Update:  2009-06-09    Views:  13,022

Secunia Advisory SA35109

Where:

From remote

Impact:

Security Bypass

Solution Status:

Vendor Patch

CVE Reference(s):

Description


Some vulnerabilities have been reported in Microsoft Internet Information Services (IIS), which can be exploited by malicious people to bypass certain security restrictions.

1) An error exists in the handling WebDAV requests for directories requiring authentication. This can be exploited to bypass access restrictions and e.g. download files from protected folders by issuing an HTTP GET request containing Unicode characters and a "Translate: f" HTTP header.

Successful exploitation may allow uploading arbitrary files to protected WebDAV folders.

2) An error in the WebDAV extension when decoding URLs can be exploited to bypass access restrictions and e.g. download normally restricted files by requesting a specially crafted URL.


Solution:
Apply patches.

Further details available to Secunia VIM customers

Provided and/or discovered by:
1) Nikolaos Rangos (Kingcope)
2) The vendor credits Yamata Li of Palo Alto Networks.

Original Advisory:
Microsoft:
http://www.microsoft.com/technet/security/Bulletin/MS09-020.mspx

Microsoft (KB971492):
http://www.microsoft.com/technet/security/advisory/971492.mspx

http://blogs.technet.com/srd/archive/2009/05/18/more-information-about-the-iis-authentication-bypass.aspx

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Microsoft Internet Information Services WebDAV Security Bypass Vulnerabilities

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