CVE-2019-1020011

Vulnerability

SmokeDetector, a community-run spam detection tool, is designed to automatically deploy updated copies of itself without requiring authority from the server operator. This intentional design means that any code pushed to the repository can be automatically executed on all instances that are part of the pool. The affected versions include all deployments that use the automatic update feature, as described in the advisory [1].

Exploitation

An attacker with the ability to push code to the SmokeDetector repository (e.g., a project maintainer or someone who compromises the repository) can trigger an automatic deployment. No additional authentication or user interaction is required from the server operator, as the update process runs automatically. The attacker's code then executes in the context of the user running the SmokeDetector process on each server [1].

Impact

Successful exploitation results in remote code execution (RCE) with the privileges of the SmokeDetector process. This can lead to complete loss of confidentiality, integrity, and availability of the affected system, especially if the process runs with elevated permissions or on a system hosting sensitive services [1].

Mitigation

No patch is available because this behavior is by design. Server operators are strongly advised to run SmokeDetector under a user account with limited permissions, within a container, virtual machine, or on a dedicated isolated system. Running SmokeDetector alongside critical infrastructure is inadvisable [1].