A setuid backdoor bin. Useful when testing sudoers rules etc and you do not want to get locked out of root.

create_berootbin.sh

#!/bin/bash
# Create a bin for privilege escalation. 

where_gcc=$(which gcc || exit 1)

TMPFILE="devtest.c"
FILEDEST="/usr/local/bin/beroot"
TMPDIR=$(mktemp -d)
CURWD=$(pwd)
cd $TMPDIR || exit 1;

# create suid laucher c
echo 'int main(void){setresuid(0, 0, 0);system("/bin/sh");}' > $TMPFILE

# compile
$where_gcc $TMPFILE -o suid 2>/dev/null

rm -f $TMPFILE
sudo chown root:root suid
sudo chmod 4777 suid
sudo mv -v suid $FILEDEST

cd $CURWD

# clean up
rm -rf -- $TMPDIR