CVE-2025-2313: Print.pl Service RCE Vulnerability

CVE-2025-2313 Overview

A critical code injection vulnerability has been identified in the Print.pl service. The uhcPrintServerPrint function allows execution of arbitrary code via the CopyCounter parameter. This vulnerability enables attackers with adjacent network access to execute malicious code without requiring authentication or user interaction, potentially leading to complete system compromise.

Critical Impact

This code injection vulnerability allows unauthenticated attackers on adjacent networks to execute arbitrary code via the CopyCounter parameter, potentially leading to full system compromise including data theft, lateral movement, and persistent access.

Affected Products

• Print.pl service (specific versions not disclosed)

Discovery Timeline

• August 27, 2025 - CVE-2025-2313 published to NVD
• August 29, 2025 - Last updated in NVD database

Technical Details for CVE-2025-2313

Vulnerability Analysis

This vulnerability is classified as CWE-94 (Improper Control of Generation of Code, or Code Injection). The uhcPrintServerPrint function within the Print.pl service fails to properly validate or sanitize the CopyCounter parameter before processing it. This lack of input validation allows an attacker to inject and execute arbitrary code within the context of the vulnerable service.

The attack requires adjacent network access, meaning the attacker must be on the same network segment as the vulnerable system. However, no authentication credentials or user interaction are required to exploit this vulnerability, making it highly dangerous in environments where network segmentation is weak or non-existent.

Root Cause

The root cause of this vulnerability lies in improper input validation within the uhcPrintServerPrint function. The CopyCounter parameter is processed without adequate sanitization, allowing specially crafted input to be interpreted and executed as code. This represents a classic code injection flaw where user-controlled input is passed directly to a code execution context without proper escaping or validation.

Attack Vector

The attack vector requires adjacent network access to the vulnerable Print.pl service. An attacker positioned on the same network segment can send malicious requests to the uhcPrintServerPrint function with a crafted CopyCounter parameter value. The injected code is then executed by the service, potentially with the same privileges as the Print.pl service process.

The exploitation flow involves:

1. Identifying a vulnerable Print.pl service on the adjacent network
2. Crafting a malicious request with code injection payload in the CopyCounter parameter
3. Sending the request to the uhcPrintServerPrint function
4. Achieving arbitrary code execution on the target system

For detailed technical information, refer to the CERT Poland CVE-2025-2313 advisory.

Detection Methods for CVE-2025-2313

Indicators of Compromise

• Unusual process spawning from the Print.pl service or related printing processes
• Unexpected network connections originating from the print service to external or suspicious destinations
• Modified or anomalous values in CopyCounter parameter logs that contain code-like patterns
• Evidence of code execution artifacts such as shell commands in application logs

Detection Strategies

• Monitor network traffic for suspicious requests to the Print.pl service containing unusual CopyCounter parameter values
• Implement application-level logging to capture all requests to the uhcPrintServerPrint function
• Deploy intrusion detection signatures to identify code injection patterns in print service traffic
• Use behavioral analysis to detect anomalous process execution chains originating from print services

Monitoring Recommendations

• Enable verbose logging on Print.pl service to capture all parameter values received
• Configure SIEM alerts for code injection indicators such as shell metacharacters in print service logs
• Monitor for lateral movement attempts following any potential exploitation of print services
• Implement network segmentation monitoring to detect unauthorized adjacent network access

How to Mitigate CVE-2025-2313

Immediate Actions Required

• Restrict network access to the Print.pl service to only trusted hosts and segments
• Implement network segmentation to limit adjacent network exposure
• Review and audit all systems running the Print.pl service for signs of compromise
• Consider disabling the uhcPrintServerPrint function if not operationally required

Patch Information

Monitor the CERT Poland CVE-2025-2313 advisory for official patch information and vendor updates. Apply security patches immediately when available from the vendor.

Workarounds

• Implement strict input validation on the CopyCounter parameter using web application firewall rules
• Restrict network access to the Print.pl service using firewall rules to limit exposure to trusted adjacent networks only
• Deploy a reverse proxy with input sanitization capabilities in front of the vulnerable service
• Consider running the Print.pl service in a sandboxed or containerized environment to limit the impact of potential exploitation

# Example firewall rule to restrict Print.pl service access
# Adjust port and IP ranges according to your environment
iptables -A INPUT -p tcp --dport <PRINT_SERVICE_PORT> -s <TRUSTED_NETWORK_CIDR> -j ACCEPT
iptables -A INPUT -p tcp --dport <PRINT_SERVICE_PORT> -j DROP