ScanCode.io command injection in docker image fetch process

ScanCode.io is a server to script and automate software composition analysis with ScanPipe pipelines. Prior to version 32.5.1, the software has a possible command injection vulnerability in the docker fetch process as it allows to append malicious commands in the docker_reference parameter.

In the function scanpipe/pipes/fetch.py:fetch_docker_image the parameter docker_reference is user controllable. The docker_reference variable is then passed to the vulnerable function get_docker_image_platform. However, the get_docker_image_plaform function constructs a shell command with the passed docker_reference. The pipes.run_command then executes the shell command without any prior sanitization, making the function vulnerable to command injections. A malicious user who is able to create or add inputs to a project can inject commands. Although the command injections are blind and the user will not receive direct feedback without logs, it is still possible to cause damage to the server/container. The vulnerability appears for example if a malicious user adds a semicolon after the input of docker://;, it would allow appending malicious commands.

Version 32.5.1 contains a patch for this issue. The docker_reference input should be sanitized to avoid command injections and, as a workaround, one may avoid creating commands with user controlled input directly.