CVE-2003-1142 in LPD-LPR Print Server
Summary
by MITRE
Help in NIPrint LPD-LPR Print Server 4.10 and earlier executes Windows Explorer with SYSTEM privileges, which allows local users to gain privileges.
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Analysis
by VulDB Data Team • 04/01/2025
The vulnerability described in CVE-2003-1142 represents a critical privilege escalation flaw within the NIPrint LPD-LPR Print Server version 4.10 and earlier implementations. This issue stems from the improper handling of help functionality within the print server software, where the help component is executed with elevated SYSTEM privileges. The flaw exists in the software's design and implementation, specifically in how it manages the execution context of help files and associated processes. When local users interact with the help system, the application inadvertently launches Windows Explorer with administrative privileges, creating an avenue for unauthorized privilege elevation.
The technical nature of this vulnerability aligns with CWE-276, which addresses improper privileges, and CWE-78, covering improper neutralization of special elements used in OS commands. The flaw exploits the principle of least privilege by allowing a local user to execute processes with SYSTEM-level permissions through legitimate help system interfaces. This represents a classic case of privilege escalation where the application's help functionality becomes an attack vector for privilege elevation. The vulnerability is particularly concerning because it requires no special authentication or network access, making it exploitable by any local user with access to the system.
From an operational impact perspective, this vulnerability enables local users to gain SYSTEM-level access to the affected system, which provides complete control over the print server and potentially the entire host system. Attackers could leverage this privilege escalation to install malicious software, modify system configurations, access sensitive data, or establish persistent access through the print server service. The impact extends beyond just the print server functionality, as the compromised system could serve as a foothold for broader network infiltration. The vulnerability affects organizations using older versions of NIPrint LPD-LPR Print Server, which were commonly deployed in enterprise environments for managing print services across networks.
The mitigation strategies for this vulnerability include immediate patching of the NIPrint LPD-LPR Print Server to version 4.11 or later, which addresses the privilege escalation issue through proper privilege management. System administrators should also implement the principle of least privilege by restricting local user access to the help functionality and ensuring that only authorized personnel have access to the print server configuration. Additional protective measures include monitoring for unauthorized access attempts, implementing application whitelisting policies, and conducting regular security assessments of print server configurations. Organizations should also consider implementing network segmentation to limit the potential impact of such vulnerabilities and ensure that print servers operate with minimal required privileges. The vulnerability demonstrates the importance of proper privilege management in system components and highlights the need for security reviews of all application functionalities, particularly those that interface with operating system components like Windows Explorer.