CVE-2025-27683: Vasion Print Path Traversal Vulnerability

CVE-2025-27683 Overview

CVE-2025-27683 is an unrestricted file upload vulnerability [CWE-434] in Vasion Print (formerly PrinterLogic) affecting the Virtual Appliance Host and Application components. The flaw, tracked internally by the vendor as V-2022-006, allows authenticated users to upload printer driver files of dangerous types without proper validation. Affected releases include Virtual Appliance Host versions prior to 1.0.735 and Application versions prior to 20.0.1330. An attacker with low-privileged access over the network can leverage the driver upload functionality to introduce malicious files into the print management environment, leading to compromise of confidentiality, integrity, and availability.

Critical Impact

Authenticated attackers can upload arbitrary files through the driver upload interface, enabling code execution and full compromise of the Vasion Print appliance.

Affected Products

• Vasion Print (PrinterLogic) Virtual Appliance Host before 1.0.735
• Vasion Print (PrinterLogic) Application before 20.0.1330
• PrinterLogic SaaS deployments running affected appliance versions

Discovery Timeline

• 2025-03-05 - CVE-2025-27683 published to NVD
• 2025-04-08 - Technical details published by Pierre Kim covering 83 Vasion/PrinterLogic vulnerabilities
• 2025-11-03 - Last updated in NVD database

Technical Details for CVE-2025-27683

Vulnerability Analysis

The vulnerability resides in the driver upload functionality of the Vasion Print management interface. The application accepts uploaded files intended to be printer drivers but fails to enforce restrictions on file type, content, or extension. Because printer driver packages legitimately contain executable binaries and scripts, the upload handler processes a wide range of file types without strict validation.

An attacker authenticated with low privileges can submit a crafted file through the driver upload endpoint. The server stores the file in a location accessible to the application or print spooler. When the file is later referenced, processed, or pushed to managed endpoints, the malicious payload executes in the context of the appliance or the receiving systems.

The issue is classified under [CWE-434] Unrestricted Upload of File with Dangerous Type. The vulnerability requires network access and valid credentials but no user interaction, and successful exploitation results in high impact across confidentiality, integrity, and availability.

Root Cause

The root cause is missing or insufficient server-side validation of uploaded driver files. The application trusts the file extension or MIME type supplied by the client and does not enforce an allowlist of permitted driver formats or verify file signatures. This permits arbitrary file types to be stored and later executed.

Attack Vector

Exploitation requires an authenticated session against the Vasion Print web interface. The attacker navigates to the driver management functionality and uploads a malicious file disguised as a printer driver. Once stored, the file can be invoked through subsequent application workflows or delivered to managed print clients, resulting in code execution on the appliance or downstream systems.

The vulnerability mechanism is described in the Pierre Kim research blog on Vasion/PrinterLogic vulnerabilities and the Full Disclosure Mailing List April 2025 post.

Detection Methods for CVE-2025-27683

Indicators of Compromise

• Unexpected files with executable extensions (.exe, .dll, .bat, .ps1, .sh) stored in Vasion Print driver repositories
• Driver upload events originating from non-administrative or unfamiliar user accounts
• Outbound network connections from the Vasion Print appliance to unknown external hosts following driver uploads
• New processes spawned by the print management service or print spooler that do not match known driver installation patterns

Detection Strategies

• Monitor Vasion Print application logs for driver upload events and correlate with the uploading account, source IP, and file hash
• Implement file integrity monitoring on directories used to store uploaded driver packages on the Virtual Appliance Host
• Inspect uploaded files against an allowlist of known-good driver signatures and flag deviations
• Alert on driver pushes to endpoints that occur outside scheduled change windows

Monitoring Recommendations

• Forward Vasion Print application and appliance logs to a centralized SIEM for retention and correlation
• Track authentication events for accounts holding driver management privileges and review for anomalies
• Baseline normal driver upload frequency and volume, and alert on statistical deviations
• Monitor endpoint telemetry on print clients for unexpected child processes of the print spooler service

How to Mitigate CVE-2025-27683

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
• Restrict driver management permissions to a minimal set of administrative accounts
• Audit existing driver repositories for unauthorized or recently modified files and remove suspicious artifacts
• Enforce multi-factor authentication on all Vasion Print administrative accounts to limit credential-based abuse

Patch Information

Vasion has released fixed versions addressing V-2022-006. Administrators should consult the PrinterLogic Security Bulletins for the latest version guidance and apply updates to both the Virtual Appliance Host and Application components. SaaS-hosted tenants should confirm with Vasion that their environment has been updated.

Workarounds

• Restrict network access to the Vasion Print management interface using firewall rules or VPN gating until patches are applied
• Disable or limit the driver upload functionality where operationally feasible
• Rotate credentials for any account with driver management privileges if compromise is suspected
• Place the appliance behind a reverse proxy that performs file-type inspection on uploads

# Example firewall restriction limiting management access to a trusted admin subnet
iptables -A INPUT -p tcp --dport 443 -s 10.10.50.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP