Remote Code Execution in Docker Engine API Authentication
The Docker Engine API in versions prior to 25.0.3 contains an authentication bypass vulnerability in the daemon socket that could allow an unauthenticated attacker to execute arbitrary code with root privileges via specially crafted API requests.
This section explains the vulnerability in everyday language, so anyone can understand the risk and impact.
A serious security flaw was found in Docker, the popular software used to run applications in containers. The problem is in how Docker checks if users are allowed to access its control system (called the API).
An attacker could potentially trick Docker into letting them in without proper permission, even if they don't have a valid password or authentication token. Once in, they could run any code they want on the server with full administrator access. This is particularly dangerous because Docker typically runs with high-level system privileges.
This vulnerability affects all Docker installations that expose their API endpoint, which is common in cloud and enterprise environments.
Affected Products
Remediation
1. Immediately upgrade Docker Engine to version 25.0.3 or later
2. If immediate upgrade is not possible, restrict access to Docker daemon socket using firewall rules
3. Ensure Docker API endpoint is not exposed to untrusted networks
4. Implement proper authentication mechanisms for Docker API access
5. Monitor Docker daemon logs for unauthorized access attempts