CVE-2008-0764 in Network Print Server
Summary
by MITRE
Format string vulnerability in the logging function in Larson Network Print Server (LstNPS) 9.4.2 build 105 and earlier for Windows might allow remote attackers to execute arbitrary code via format string specifiers in a USEP command on TCP port 3114.
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Analysis
by VulDB Data Team • 11/10/2017
The vulnerability identified as CVE-2008-0764 represents a critical format string vulnerability within the logging functionality of the Larson Network Print Server version 9.4.2 build 105 and earlier. This issue specifically affects Windows-based systems running the LstNPS software, creating a significant security risk that can be exploited remotely. The vulnerability manifests through the USEP command processed on TCP port 3114, which serves as the primary attack vector for malicious actors seeking to compromise affected systems. The flaw exists in how the application handles user input within its logging mechanisms, where improper validation allows attackers to inject format specifiers that can manipulate memory operations.
The technical exploitation of this vulnerability stems from the improper handling of format strings in the logging subsystem, which directly maps to CWE-134, a well-documented weakness related to the use of untrusted data in format string operations. When the logging function processes user-supplied data without proper sanitization, it creates opportunities for attackers to craft malicious input that can trigger buffer overflows, memory corruption, or arbitrary code execution. The USEP command on port 3114 acts as the entry point where attackers can inject specially crafted format specifiers that manipulate the application's memory layout. This vulnerability aligns with ATT&CK technique T1059.007, which covers the use of command and scripting interpreters, as the exploitation can lead to full system compromise through code execution.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with a pathway to achieve complete system control of affected print servers. Network print servers are often considered critical infrastructure components within enterprise environments, making them attractive targets for adversaries seeking persistent access or lateral movement. The remote nature of the attack means that exploitation can occur without physical access to the system, and the vulnerability affects a specific version range, making it particularly dangerous for organizations that have not updated their print server software. The potential for arbitrary code execution through format string manipulation creates opportunities for attackers to install backdoors, exfiltrate data, or establish persistent access points within the network. Organizations running affected versions of LstNPS are at risk of unauthorized access to print job data, system resources, and potentially sensitive information processed through the print server.
Mitigation strategies for this vulnerability should include immediate patching of the affected software to version 9.4.2 build 106 or later, which contains the necessary fixes for the format string handling issue. Network segmentation and firewall rules should be implemented to restrict access to TCP port 3114, limiting exposure to only trusted network segments. Additionally, organizations should consider implementing network monitoring to detect suspicious USEP command patterns and format string injection attempts. The vulnerability also highlights the importance of input validation and secure coding practices, particularly in logging functions that process user-supplied data. Security teams should conduct comprehensive vulnerability assessments to identify other systems running older versions of the software and ensure proper patch management procedures are in place to prevent similar issues in the future.