~/bokkapig
hack the box machine writeups

update-alternatives

File write

This executable can write data to local files.
  1. CommentWrite in /path/to/output-file a symlink to /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 DATA >/path/to/temp-file
update-alternatives --force --install /path/to/output-file x /path/to/temp-file 0
    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.
    echo DATA >/path/to/temp-file
update-alternatives --force --install /path/to/output-file x /path/to/temp-file 0