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Hacking Exposed Windows 2000: Network Security Secrets & Solutions
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Now that we ve laid some groundwork for Web hacking and discussed the basic toolkit, let s talk about some specific IIS 5 attacks: w s v Buffer overflows File system traversal Source code revelation
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Practically exploitable remote buffer overflows on Windows are rare, but many of the most serious have been discovered in IIS The first was the htr buffer overflow exploit against IIS 4, discovered by eEye Digital Security in June 1999 and, as you see in this section, eEye has continued this streak with IIS 5 in grand form Of course, critical to understanding these exploits is a basic comprehension of how buffer overflows work A detailed examination of practical buffer overflow exploitation is outside of the scope of the discussion here but, in essence, buffer overflows occur when programs don t adequately check input for appropriate length Thus, any unexpected input overflows on to another portion of the CPU execution stack If this input is chosen judiciously by a rogue programmer, it can be used to launch code of the programmer s choice The key element is to craft so-called shellcode and position it near the point where the buffer overflows the execution stack, so the shellcode winds up in an identifiable location on the stack, which can then be returned to and executed We refer to this concept frequently in the upcoming discussion, and recommend consulting the References and Further Reading section on buffer overflows for those who want to explore the topic in more detail Finally, because IIS runs under the SYSTEM account context, buffer overflow exploits often allow arbitrary commands to be run as SYSTEM on the target system As you saw in 2, SYSTEM is the most powerful account on a Windows machine and, therefore, remote buffer overflow attacks are about as close to hacking nirvana as you can get We illustrate the devastation that can be wrought by these attacks in this section
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In May 2001, eEye Digital Security announced discovery of a buffer overflow within the ISAPI filter that handles printer files (C:\WINNT\System32\msw3prtdll) to provide Windows 2000 with support for the Internet Printing Protocol (IPP) IPP enables the Web-based control of various aspects of networked printers
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The vulnerability arises when a buffer of approximately 420 bytes is sent within the HTTP Host: header for a printer ISAPI request, as shown in the following example, where [buffer] is approximately 420 characters
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GET /NULLprinter HTTP/10 Host: [buffer]
This simple request causes the buffer overflow and would normally halt IIS; however, Windows 2000 automatically restarts IIS (inetinfoexe) after such crashes to provide greater resiliency for Web services Thus, this exploit produces no visible effects from a remote perspective (unless looped continuously to deny service) While the resiliency feature might keep IIS running in the event of random faults, it actually makes it easier to exploit the IPP buffer overflow to run code of the attacker s choice eEye released a proof-of-concept exploit that wrote a file to C:\wwweEyecomtxt, but with properly crafted shellcode, nearly any action is possible because the code executes in the context of the IIS process, which is to say SYSTEM Sure enough, right on the heels of the IPP buffer overflow advisory, an exploit called jill was posted to many popular security mailing lists by dark spyrit of beavuhorg Although jill is written in UNIX C, compiling it on Windows 2000 is a snap with the Cygwin environment Cygwin compiles UNIX code with an abstraction layer library cygwin1dll that intercepts the native UNIX calls and translates them into Win32 equivalents Thus, as long as the cygwin1dll is in the working path from where the compiled executable is run, it functions on Win32 just as it would under UNIX or Linux Here s how to compile jill using Cygwin: first, start the Cygwin UNIX environment (the default shell is bash), navigate to the directory where the jill source code resides (jillc), and then invoke the GNU C Compiler (gcc) to compile the binary like so (-o specifies the output file of the compilation, which under UNIX doesn t require the exe extension):
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