CVE-2025-27656: Vasion Print Information Disclosure Flaw

CVE-2025-27656 Overview

CVE-2025-27656 is a credential exposure vulnerability affecting Vasion Print (formerly PrinterLogic) Virtual Appliance and Application components. The vulnerability allows sensitive password information to be exposed through the system's process list, enabling unauthorized access to credentials by any user or process capable of reading process information on the affected system.

This vulnerability, tracked as V-2023-011 by the vendor, affects versions before Virtual Appliance Host 22.0.862 and Application 20.0.2014. The exposure of passwords in plaintext within the process list represents a significant security weakness that can be exploited by local attackers or malicious processes to harvest credentials for further attacks.

Critical Impact

Passwords stored in the process list can be read by any local user or process, potentially leading to credential theft, lateral movement, and complete system compromise.

Affected Products

• Vasion Print (formerly PrinterLogic) Application versions before 20.0.2014
• PrinterLogic Virtual Appliance Host versions before 22.0.862
• PrinterLogic SaaS deployments running vulnerable versions

Discovery Timeline

• 2025-03-05 - CVE-2025-27656 published to NVD
• 2025-11-03 - Last updated in NVD database

Technical Details for CVE-2025-27656

Vulnerability Analysis

This vulnerability falls under CWE-256 (Plaintext Storage of a Password), a configuration and design flaw where sensitive credential information is improperly handled during runtime operations. The fundamental issue is that the application stores or passes passwords through command-line arguments or environment variables that become visible in the system's process list.

On Unix-like systems, the /proc filesystem and utilities like ps can reveal command-line arguments of running processes. When credentials are passed as command-line arguments, they become visible to any user with access to process information. This allows unauthorized credential harvesting without requiring elevated privileges, as process listing is typically available to all authenticated users on the system.

The impact of this vulnerability is severe because attackers can passively monitor process lists to collect credentials over time, building a repository of authentication material for subsequent attacks.

Root Cause

The root cause of CVE-2025-27656 is the insecure practice of passing sensitive password data through mechanisms that expose the information in the process list. This typically occurs when:

• Passwords are passed as command-line arguments to executables
• Credentials are stored in environment variables that are visible in /proc/[pid]/environ
• Subprocess invocations include plaintext passwords in their argument vectors

The Vasion Print application fails to properly secure credential handling, allowing passwords to be visible through standard system process enumeration mechanisms. Secure alternatives include using configuration files with restricted permissions, secure credential stores, or inter-process communication channels that do not expose data in process metadata.

Attack Vector

The attack vector for this vulnerability is local, requiring the attacker to have authenticated access to the system running the vulnerable Vasion Print components. The exploitation process involves:

1. Local Access: The attacker gains authenticated access to the system through legitimate credentials, a compromised account, or another vulnerability
2. Process Enumeration: The attacker monitors the process list using standard utilities such as ps aux, top, or by reading /proc/*/cmdline
3. Credential Harvesting: When the vulnerable Vasion Print application executes processes with passwords in the command line, the attacker captures these credentials
4. Privilege Escalation: Harvested credentials can be used for lateral movement, accessing additional systems, or escalating privileges within the print management infrastructure

The network-based attack complexity indicated in the vulnerability metrics suggests that remote exploitation scenarios may exist where an attacker can trigger process execution and observe the results through other vulnerabilities or misconfigurations.

Detection Methods for CVE-2025-27656

Indicators of Compromise

• Unusual process monitoring activity on systems running Vasion Print components
• Evidence of credential reuse attacks using harvested PrinterLogic credentials
• Suspicious authentication attempts using service accounts associated with PrinterLogic
• Presence of scripts or tools designed to monitor /proc filesystem or process lists
• Unauthorized access to print management administrative functions

Detection Strategies

• Deploy endpoint detection solutions to monitor for process enumeration activities targeting PrinterLogic processes
• Implement file integrity monitoring on PrinterLogic configuration directories
• Review authentication logs for anomalous login patterns using PrinterLogic service credentials
• Monitor for tools commonly used to harvest process information such as pspy or custom /proc readers
• Correlate print management system access with user behavior analytics to identify credential theft

Monitoring Recommendations

• Enable verbose logging on Vasion Print components to capture authentication events
• Configure SIEM rules to alert on repeated process enumeration commands targeting known PrinterLogic process names
• Implement privileged access monitoring for systems hosting PrinterLogic Virtual Appliance
• Establish baseline behavior for legitimate PrinterLogic administrative activities to detect anomalies
• Monitor network traffic from PrinterLogic servers for unexpected outbound connections that may indicate credential exfiltration

How to Mitigate CVE-2025-27656

Immediate Actions Required

• Upgrade Vasion Print Application to version 20.0.2014 or later
• Upgrade Virtual Appliance Host to version 22.0.862 or later
• Audit and rotate all credentials that may have been exposed on vulnerable systems
• Review access logs on affected systems for evidence of credential harvesting
• Restrict local access to systems running PrinterLogic components to essential personnel only

Patch Information

Vasion (PrinterLogic) has released patched versions that address this vulnerability. Organizations should upgrade to Virtual Appliance Host version 22.0.862 or later and Application version 20.0.2014 or later. The security update modifies credential handling to prevent password exposure in process lists.

For detailed patch information and upgrade instructions, refer to the PrinterLogic Security Bulletins. Additional technical analysis of this and related vulnerabilities is available in the Pierre Kim security research blog.

Workarounds

• Implement strict access controls limiting local shell access on PrinterLogic servers
• Deploy application whitelisting to prevent unauthorized process monitoring tools
• Use network segmentation to isolate print management infrastructure from general user networks
• Enable process auditing through operating system security features to detect enumeration attempts
• Consider deploying privileged access management solutions to control and monitor administrative access

# Restrict access to process information (Linux)
# Add to /etc/sysctl.conf to hide process information from non-root users
echo "kernel.hidepid=2" >> /etc/sysctl.conf
sysctl -p

# Verify PrinterLogic version
# Check Virtual Appliance Host version in admin console
# Ensure version is 22.0.862 or later