I. 背景

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"IIS is a web server application and set of

feature extension modules created by Microsoft for use with Microsoft Windows.

IIS is the third most popular server in the world." (Wikipedia)

II. 概述

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Vulnerability Research Team discovered a vulnerability

in Microsoft IIS.

The vulnerability is caused by a tilde character "~" in a Get request, which could allow remote attackers

to diclose File and Folder names.

III. 影响产品

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IIS 1.0, Windows NT 3.51

IIS 2.0, Windows NT 4.0

IIS 3.0, Windows NT 4.0 Service Pack 2

IIS 4.0, Windows NT 4.0 Option Pack

IIS 5.0, Windows 2000

IIS 5.1, Windows XP Professional and Windows XP Media Center Edition

IIS 6.0, Windows Server 2003 and Windows XP Professional x64 Edition

IIS 7.0, Windows Server 2008 and Windows Vista

IIS 7.5, Windows 7 (error remotely enabled or no web.config)

IIS 7.5, Windows 2008 (classic pipeline mode)

Note: Does not work when IIS uses .Net Framework 4.

IV. Binary Analysis & Exploits/PoCs

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Tilde character "~" can be used to find short names of files and folders when the website is running on IIS.

The attacker can find important file and folders that they are not normaly visible.

In-depth technical analysis of the vulnerability and a functional exploit

are available through:

http://soroush.secproject.com/blog/2012/06/microsoft-iis-tilde-character-vulnerabilityfeature-short-filefolder-name-disclosure/

V. 解决方案

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There are still workarounds through Vendor and security vendors.

Using a configured WAF may be usefull (discarding web requests including the tilde "~" character).

VII. 参考

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http://support.microsoft.com/kb/142982/en-us

http://soroush.secproject.com/blog/2010/07/iis5-1-directory-authentication-bypass-by-using-i30index_allocation/