Hacking IIS 5 and Web Applications in VS .NET

Painting ANSI/AIM Code 128 in VS .NET Hacking IIS 5 and Web Applications

Hacking IIS 5 and Web Applications
Code 128 Code Set A Maker In VS .NET
Using Barcode printer for Visual Studio .NET Control to generate, create Code 128A image in Visual Studio .NET applications.
Decoding Code128 In .NET
Using Barcode reader for .NET Control to read, scan read, scan image in .NET applications.
The Permissions Wizard is accessible by right-clicking the appropriate virtual directory in the IIS Admin console Move, Rename, or Delete any Command-Line Utilities that Could Assist an Attacker, and/or Set Restrictive Permissions on Them Eric Schultze, Program Manager on Microsoft s Security Response Team, and David LeBlanc, Senior Security Technologist for Microsoft, recommend at least setting the NTFS ACLs on cmdexe and several other powerful executables to Administrator and SYSTEM:Full Control only They have publicly demonstrated this simple trick stops most Unicode-type shenanigans cold because IUSR no longer has permissions to access cmdexe Schultze and LeBlanc recommend using the built-in cacls tool to set these permissions globally Let s walk through an example of how cacls might be used to set permissions on executable files in the system directory Because so many executable files are in the system folder, it s easier if you use a simpler example of several files sitting in a directory called test1 with subdirectory test2 Using cacls in display-only mode, we can see the existing permissions on our test files are pretty lax:
Create Barcode In Visual Studio .NET
Using Barcode encoder for Visual Studio .NET Control to generate, create bar code image in .NET framework applications.
Bar Code Scanner In Visual Studio .NET
Using Barcode recognizer for .NET Control to read, scan read, scan image in .NET applications.
C:\>cacls test1 /T C:\test1 Everyone:(OI)(CI)F C:\test1\test1exe Everyone:F C:\test1\test1txt Everyone:F C:\test1\test2 Everyone:(OI)(CI)F C:\test1\test2\test2exe Everyone:F C:\test1\test2\test2txt Everyone:F
Code 128 Encoder In Visual C#
Using Barcode printer for VS .NET Control to generate, create Code 128A image in VS .NET applications.
USS Code 128 Drawer In Visual Studio .NET
Using Barcode generation for ASP.NET Control to generate, create Code 128 Code Set C image in ASP.NET applications.
Let s say you want to change permissions on all executable files in test1 and all subdirectories to System:Full, Administrators:Full Here s the command syntax using cacls:
Encoding Code128 In Visual Basic .NET
Using Barcode creator for .NET Control to generate, create Code 128C image in .NET framework applications.
Bar Code Maker In Visual Studio .NET
Using Barcode encoder for Visual Studio .NET Control to generate, create bar code image in .NET applications.
C:\>cacls test1\*exe /T /G System:F Administrators:F Are you sure (Y/N) y processed file: C:\test1\test1exe processed file: C:\test1\test2\test2exe
Matrix 2D Barcode Maker In Visual Studio .NET
Using Barcode encoder for Visual Studio .NET Control to generate, create Matrix 2D Barcode image in .NET framework applications.
Encoding Code 128A In VS .NET
Using Barcode generation for .NET framework Control to generate, create Code 128B image in Visual Studio .NET applications.
Now we run cacls again to confirm our results Note, the txt files in all subdirectories have the original permissions, but the executable files are now set more appropriately:
Encode GS1 DataBar Truncated In Visual Studio .NET
Using Barcode printer for VS .NET Control to generate, create GS1 DataBar Expanded image in .NET applications.
Make 2 Of 5 Interleaved In Visual Studio .NET
Using Barcode generation for Visual Studio .NET Control to generate, create Interleaved 2 of 5 image in Visual Studio .NET applications.
C:\>cacls test1 /T C:\test1 Everyone:(OI)(CI)F C:\test1\test1exe NT AUTHORITY\SYSTEM:F BUILTIN\Administrators:F C:\test1\test1txt Everyone:F C:\test1\test2 Everyone:(OI)(CI)F C:\test1\test2\test2exe NT AUTHORITY\SYSTEM:F BUILTIN\Administrators:F C:\test1\test2\test2txt Everyone:F
Create Bar Code In Visual Basic .NET
Using Barcode generator for .NET framework Control to generate, create barcode image in .NET applications.
Encode UCC.EAN - 128 In VB.NET
Using Barcode drawer for Visual Studio .NET Control to generate, create EAN / UCC - 14 image in VS .NET applications.
Hacking Exposed Windows 2000: Network Security Secrets & Solutions
USS-128 Generator In Java
Using Barcode drawer for Eclipse BIRT Control to generate, create UCC - 12 image in BIRT reports applications.
Generate Code 128B In Java
Using Barcode generator for Java Control to generate, create Code 128 Code Set C image in Java applications.
Applying this example to a typical Web server, a good idea would be to set ACLs on all executables in the %systemroot% directory to System:Full, Administrators:Full, like so:
Recognizing Code 3/9 In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
Bar Code Generation In Java
Using Barcode generation for Java Control to generate, create bar code image in Java applications.
C:\>cacls %systemroot%\*exe /T /G System:F Administrators:F
EAN 128 Generation In None
Using Barcode creator for Microsoft Word Control to generate, create EAN 128 image in Word applications.
EAN / UCC - 14 Encoder In .NET
Using Barcode creation for Reporting Service Control to generate, create EAN / UCC - 13 image in Reporting Service applications.
This blocks nonadministrative users from using these executables and helps to prevent exploits like Unicode that rely heavily on nonprivileged access to these programs The Resource Kit xcacls utility is almost exactly the same as cacls, but provides some additional capabilities, including the capability to set special access permissions You can also use Windows 2000 Security Templates to configure NTFS ACLs automatically (see 16) Of course, such executables may also be moved, renamed, or deleted This puts them out of the reach of hackers with even more finality Remove the Everyone and Users Groups from Write and Execute ACLs on the Server IUSR_machinename and IWAM_machinename are members of these groups Be extra sure the IUSR and IWAM accounts don t have write access to any files or directories on your system you ve seen what even a single writable directory can lead to! Also, seriously scrutinize Execute permissions for nonprivileged groups and especially don t allow any nonprivileged user to have both write and execute permissions to the same directory! Know What It Looks Like When You Are/Have Been Under Attack As always, treat incident response as seriously as prevention especially with fragile Web servers To identify if your servers have been the victim of a Unicode attack, remember the four P s: ports, processes, file system and Registry footprint, and poring over the logs Foundstone provides a great tool called Vision that maps listening ports on a system to processes What s great about Vision is it provides the way to probe or kill processes right from the GUI by right-clicking the specific port/process in question Read more about Vision in 9 From a file and Registry perspective, a host of canned exploits based on the Unicode technique are circulating on the Internet We will discuss files like sensepostexe, unicodeloaderpl, uploadasp, uploadinc, and cmdaspasp that play central roles in exploiting the vulnerability Although trivially renamed, at least you ll keep the script kiddies at bay Especially keep an eye out for these files in writable/executable directories like /scripts Some other commonly employed exploits deposit files with names like rootexe (a renamed command shell), easp, dlexe, regginaexe, regitexe, restsecexe, makeiniexe, newginadll, firedaemonexe, mmtaskexe, sudexe, and sudbak In the log department, IIS enters the ASCII representations of the overlong Unicode / and \ , making it harder to determine if foul play is at work Here are some telltale entries from actual Web server logs that came from systems compromised by Unicode (asterisks equal wildcards):
GET /scripts/\/winnt/system32/cmdexe /c+dir 200 GET /scripts///winnt/system32/tftpexe*
10:
Copyright © OnBarcode.com . All rights reserved.