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Microsoft IIS 6.0 / 7.5 Authentication Bypass

Microsoft IIS 6.0 / 7.5 Authentication Bypass
Posted Jun 11, 2012
Authored by Kingcope

Microsoft IIS versions 6.0 and 7.5 suffer from various authentication bypass vulnerabilities. 7.5 also suffers from a source code disclosure flaw.

tags | exploit, vulnerability, bypass
MD5 | da7102006bae4b9bac7cab98cd26ed40

Microsoft IIS 6.0 / 7.5 Authentication Bypass

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THIS IS A GENUINE ISOWAREZ RELEASE
********************************************************
------------------------------------------------------------------------------------------------------------------------------------------------------------
Title: Microsoft IIS 6.0 with PHP installed Authentication Bypass

Affected software:
Microsoft IIS 6.0 with PHP installed
(tested on Windows Server 2003 SP1 running PHP5)

Details:
By sending a special request to the IIS 6.0 Service running PHP the attacker can
successfully bypass access restrictions.

Take for example:
1.) IIS/6.0 has PHP installed
2.) There is a Password Protected directory configured
--> An attacker can access PHP files in the password protected
directory and execute them without supplying proper credentials.
--> Example request (path to the file): /admin::$INDEX_ALLOCATION/index.php

IIS/6.0 will gracefully load the PHP file inside the "admin" directory
if the ::$INDEX_ALLOCATION postfix is appended to directory name.
This can result in accessing administrative files and under special
circumstances execute arbirary code remotely.
------------------------------------------------------------------------------------------------------------------------------------------------------------

Title: Microsoft IIS 7.5 Classic ASP Authentication Bypass

Affected Software:
Microsoft IIS 7.5 with configured Classic ASP and .NET Framework 4.0
installed (.NET Framework 2.0 is unaffected, other .NET frameworks
have not been tested)
(tested on Windows 7)

Details:
By appending ":$i30:$INDEX_ALLOCATION" to the directory serving the
classic ASP file access restrictions can be successfully bypassed.

Take this Example:
1.) Microsoft IIS 7.5 has Classic ASP configured (it allows serving .asp files)
2.) There is a password protected directory configured that has
administrative asp scripts inside
3.) An attacker requests the directory with :$i30:$INDEX_ALLOCATION
appended to the directory name
4.) IIS/7.5 gracefully executes the ASP script without asking for
proper credentials

------------------------------------------------------------------------------------------------------------------------------------------------------------
Title: Microsoft IIS 7.5 .NET source code disclosure and authentication bypass

Affected Software:
Microsoft IIS/7.5 with PHP installed in a special configuration
(Tested with .NET 2.0 and .NET 4.0)
(tested on Windows 7)
The special configuration requires the "Path Type" of PHP to be set to
"Unspecified" in the Handler Mappings of IIS/7.5

Details:
The authentication bypass is the same as the previous vulnerabilities:
Requesting for example
http://<victimIIS75>/admin:$i30:$INDEX_ALLOCATION/admin.php will run
the PHP script without asking for proper credentials.

By appending /.php to an ASPX file (or any other file using the .NET
framework that is not blocked through the request filtering rules,
like misconfigured: .CS,.VB files)
IIS/7.5 responds with the full source code of the file and executes it
as PHP code. This means that by using an upload feature it might be
possible (under special circumstances) to execute arbitrary PHP code.
Example: Default.aspx/.php



Cheerio and signed,

/Kingcope

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