CVE-2025-27685 Overview
CVE-2025-27685 affects Vasion Print (formerly PrinterLogic) Virtual Appliance Host versions before 1.0.735 with Application versions before 20.0.1330. A configuration file on the appliance contains a Certificate Authority (CA) certificate and its associated private key. The issue is tracked internally as advisory V-2022-001 and falls under CWE-312: Cleartext Storage of Sensitive Information. Unauthorized retrieval of this key material allows attackers to forge trusted certificates and impersonate the appliance. The flaw is reachable over the network without authentication or user interaction, exposing confidentiality of cryptographic secrets.
Critical Impact
Exposure of a CA private key allows an attacker to issue trusted certificates, decrypt intercepted traffic, and impersonate trusted print infrastructure.
Affected Products
- PrinterLogic Vasion Print Virtual Appliance Host before 1.0.735
- PrinterLogic Vasion Print Application before 20.0.1330
- PrinterLogic Virtual Appliance deployments running pre-fix builds
Discovery Timeline
- 2025-03-05 - CVE-2025-27685 published to NVD
- 2025-04-08 - Technical details published in Pierre Kim Blog on Vulnerabilities
- 2025-04 - Disclosure posted to the Full Disclosure Mailing List
- 2025-11-03 - Last updated in NVD database
Technical Details for CVE-2025-27685
Vulnerability Analysis
The Vasion Print Virtual Appliance ships with a configuration file that stores both a CA certificate and its private key in cleartext. Any actor who can read this file gains the cryptographic material needed to sign arbitrary certificates trusted by appliance components. The vulnerability is classified under CWE-312, which covers storage of sensitive information without adequate protection.
The weakness sits at the configuration layer, meaning normal patching of application logic is insufficient. The affected appliance distributes a shared CA across deployments, which compounds the impact. An attacker holding the private key can mint certificates accepted by clients that trust the embedded CA. This breaks the trust boundary between the appliance and any system that validates certificates against the bundled root.
Root Cause
The root cause is improper handling of secrets in the appliance configuration. Vasion Print embeds the CA private key alongside non-sensitive configuration data instead of isolating it in a protected key store. The key is not encrypted at rest and is not generated uniquely per deployment in vulnerable releases. This design exposes secret material to any code path or operator that can read configuration files.
Attack Vector
The attack vector is network-based with no required privileges or user interaction. An attacker who reaches an exposed configuration endpoint or gains read access to the appliance file system can retrieve the CA and private key. With the key in hand, the attacker can sign forged certificates for man-in-the-middle (MITM) attacks against print clients, decrypt previously captured TLS sessions where applicable, and impersonate trusted services. Refer to the PrinterLogic Security Bulletins and Pierre Kim Blog on Vulnerabilities for exploitation context.
Detection Methods for CVE-2025-27685
Indicators of Compromise
- Unexpected certificates signed by the Vasion Print bundled CA appearing on endpoints or in network captures.
- Unauthorized read access to appliance configuration files containing key material such as PRIVATE KEY PEM blocks.
- Outbound TLS sessions to print infrastructure presenting certificates with unfamiliar Subject or SAN values.
Detection Strategies
- Inventory all Vasion Print Virtual Appliance hosts and confirm their Host and Application versions against the fixed releases.
- Audit certificate stores on print clients to identify trust anchors associated with the embedded PrinterLogic CA.
- Compare CA serial numbers and fingerprints across deployments to detect shared or reused key material.
Monitoring Recommendations
- Log and alert on file access to appliance configuration paths that store certificate or key data.
- Monitor for new certificate issuance events chained to the PrinterLogic CA fingerprint.
- Capture and review network metadata for TLS handshakes involving the print appliance to detect impersonation attempts.
How to Mitigate CVE-2025-27685
Immediate Actions Required
- Upgrade the Virtual Appliance Host to version 1.0.735 or later and the Application to version 20.0.1330 or later.
- Rotate the appliance CA and reissue all certificates derived from the previously embedded key after upgrade.
- Restrict network access to the Vasion Print management interfaces to trusted administrative networks only.
Patch Information
Vasion has released fixed builds documented in the PrinterLogic Security Bulletins. Apply the Virtual Appliance Host build 1.0.735 together with Application build 20.0.1330 or later. Patching alone does not invalidate the previously exposed key material, so administrators must rotate certificates after upgrading.
Workarounds
- Place the appliance behind a segmented management VLAN with strict access control lists until patched.
- Remove or restrict trust of the embedded PrinterLogic CA on endpoints where feasible, pending key rotation.
- Enforce TLS inspection or certificate pinning policies that detect unexpected issuers on the print infrastructure path.
# Configuration example - verify installed Vasion Print versions
# On the appliance host, check the running Host and Application versions
cat /etc/printerlogic/version
# Expected (patched): Host >= 1.0.735, Application >= 20.0.1330
# After upgrade, rotate the appliance CA and regenerate issued certificates
# Follow vendor procedure from the PrinterLogic Security Bulletins page
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
