critical CVSS 9.8

CVE-2025-34207·Docker vulnerability

Vasion Print (formerly PrinterLogic) Virtual Appliance Host prior to 22.0.1049 and Application prior to 20.0.2786 (VA and SaaS deployments) configure the SSH client within Docker instances with the following options: `UserKnownHostsFile=/dev/null`, `StrictHostKeyChecking=no`, and `ForwardAgent yes`. These settings disable verification of the remote host’s SSH key and automatically forward the developer’s SSH‑agent to any host that matches the configured wildcard patterns. As a result, an attacker who can reach a single compromised container can cause the container to connect to a malicious SSH server, capture the forwarded private keys, and use those keys for unrestricted lateral movement across the environment. This vulnerability has been identified by the vendor as: V-2024-027 — Insecure Secure Shell (SSH) Configuration.

Severity
critical
Software
Docker
Fixed in
22.0.1049
Published
2025-09-29

Affected versions

Until: 22.0.1049

Fixed in: 22.0.1049

How to fix this CVE

Update Docker and Vasion Print components to patch insecure SSH client configurations that expose private keys to lateral movement attacks. Upgrade to Vasion Print Virtual Appliance Host version 22.0.1049 or later and Application version 20.0.2786 or later to disable SSH agent forwarding and enforce host key verification. Review and reconfigure SSH client settings in Docker instances to remove the dangerous `UserKnownHostsFile=/dev/null`, `StrictHostKeyChecking=no`, and `ForwardAgent yes` options.

sudo dnf update docker-ce

Defensia detects this vulnerability

How to check if you are affected

  1. Check Docker version: `docker --version` and verify it matches or exceeds the patched release for your distribution
  2. Inspect running containers for SSH client configuration: `docker inspect <container_id> | grep -i ssh` and check the container's Dockerfile or entrypoint for insecure SSH settings
  3. Search container logs for SSH connection attempts to unexpected hosts: `docker logs <container_id> | grep -i 'ssh\|known_hosts\|agent'`
  4. Verify the patch was applied by checking Vasion Print version: `curl http://<vasion_host>/api/version` or access the admin dashboard and confirm version ≥ 22.0.1049

FAQ

What is CVE-2025-34207?

This is a critical vulnerability in Vasion Print (formerly PrinterLogic) that misconfigures SSH clients in Docker containers to accept any host without verification and automatically forward SSH private keys. An attacker with access to a compromised container can intercept these forwarded keys and use them to move laterally across the network.

Is CVE-2025-34207 being actively exploited?

No, this vulnerability is not currently listed on CISA's Known Exploited Vulnerabilities (KEV) catalog and no public exploits are available, but its critical severity (CVSS 9.8) and ease of exploitation make it a high-priority target for threat actors.

What versions of Docker are affected by CVE-2025-34207?

Vasion Print Virtual Appliance Host versions prior to 22.0.1049 and Application versions prior to 20.0.2786 are affected in both VA and SaaS deployments. The vulnerability stems from insecure SSH configuration within Docker containers rather than Docker itself.

How do I check if my server is vulnerable to CVE-2025-34207?

Run `docker inspect <container_id>` on Vasion Print containers and examine the entrypoint script or environment variables for SSH settings containing `UserKnownHostsFile=/dev/null`, `StrictHostKeyChecking=no`, or `ForwardAgent yes`; if present, your deployment is vulnerable.

Does Defensia detect CVE-2025-34207?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If Docker or Vasion Print is installed on a monitored server, CVE-2025-34207 will appear in your dashboard with remediation steps.

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References

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