CVE-2025-34207
Published: 29 September 2025
Summary
CVE-2025-34207 is a critical-severity Missing Authentication for Critical Function (CWE-306) vulnerability in Vasion Virtual Appliance Application. Its CVSS base score is 9.8 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Private Keys (T1552.004); ranked at the 32.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 AC-17 (Remote Access) and CM-6 (Configuration Settings).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Mandates secure configuration settings for SSH clients in Docker instances, preventing insecure options like StrictHostKeyChecking=no and ForwardAgent=yes.
Ensures authenticity of SSH communications sessions by requiring host key verification, directly countering UserKnownHostsFile=/dev/null and no strict checking.
Manages and protects remote access mechanisms like SSH, prohibiting unauthorized forwarding of credentials and enforcing cryptographic protections for sessions.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Insecure SSH client config (no host key checking, agent forwarding) in Docker containers enables stealing forwarded private SSH keys (T1552.004), facilitating SSH-based lateral movement (T1021.004) and session hijacking via impersonated SSH servers (T1563.001).
NVD Description
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…
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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.
Deeper analysisAI
CVE-2025-34207 is an insecure SSH client configuration vulnerability affecting Vasion Print (formerly PrinterLogic) Virtual Appliance Host versions prior to 22.0.1049 and Application versions prior to 20.0.2786, in both Virtual Appliance (VA) and SaaS deployments. The issue arises within Docker instances, where the SSH client is configured with 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 matching configured wildcard patterns, as identified by the vendor under V-2024-027.
An attacker with network access to a single compromised container can exploit this configuration remotely with low complexity, no privileges, and no user interaction required. By inducing the container to connect to a malicious SSH server, the attacker can capture the forwarded private keys, enabling unrestricted lateral movement across the environment. The vulnerability carries a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) and maps to CWE-306 (Missing Authentication for Critical Function) and CWE-522 (Insufficiently Protected Credentials).
Vendor security bulletins at https://help.printerlogic.com/saas/Print/Security/Security-Bulletins.htm and https://help.printerlogic.com/va/Print/Security/Security-Bulletins.htm outline mitigation, recommending upgrades to Virtual Appliance Host 22.0.1049 or later and Application 20.0.2786 or later. Additional details on the insecure SSH configuration are provided in analyses from VulnCheck (https://www.vulncheck.com/advisories/vasion-print-printerlogic-insecure-ssh-client-config) and Pierre Kim's blog (https://pierrekim.github.io/blog/2025-04-08-vasion-printerlogic-83-vulnerabilities.html#va-insecure-ssh-config).
Details
- CWE(s)