Microsoft IIS 6.0 / 7.5 Authentication Bypass

Type packetstorm
Reporter Kingcope
Modified 2012-06-11T00:00:00


                                            `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)  
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)  
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  
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,