CVE-2003-1141 in LPD-LPR Print Server
Summary
by MITRE
Buffer overflow in NIPrint 4.10 allows remote attackers to execute arbitrary code via a long string to TCP port 515.
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Analysis
by VulDB Data Team • 07/20/2025
The vulnerability identified as CVE-2003-1141 represents a critical buffer overflow flaw within NIPrint 4.10 software that operates on TCP port 515, which is traditionally associated with the Line Printer Daemon protocol. This issue arises from insufficient input validation mechanisms within the print spooler service, creating an exploitable condition where malicious actors can craft specially formatted strings that exceed the allocated buffer space. The flaw specifically manifests when the application processes incoming data through the network interface, particularly targeting the print queue handling functionality that listens on the standard port 515. The vulnerability demonstrates characteristics consistent with CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations.
The technical exploitation of this vulnerability enables remote code execution through network-based attacks that leverage the TCP port 515 listener. Attackers can send a carefully constructed payload containing an excessively long string that overflows the designated buffer, potentially allowing them to overwrite critical memory segments including return addresses and function pointers. This type of attack falls under the ATT&CK technique T1059.007 for command and scripting interpreter, specifically targeting remote execution capabilities through network services. The buffer overflow condition creates a pathway for privilege escalation and system compromise, as the print spooler service typically operates with elevated privileges necessary for system-level operations. The attack vector requires network access to the target system on port 515, making it particularly dangerous in environments where print services are exposed to untrusted networks or the internet.
The operational impact of CVE-2003-1141 extends beyond immediate system compromise to encompass broader network security implications. Organizations running affected NIPrint versions face potential unauthorized access to their print infrastructure, which could serve as a foothold for further network infiltration. The vulnerability affects systems where print services are actively listening on TCP port 515, potentially exposing entire network segments to attack if proper network segmentation is not implemented. This condition creates a persistent security risk as the flaw exists within the core print service functionality, making it difficult to remediate without service interruption or complete software replacement. The vulnerability also demonstrates the importance of network service hardening practices, as the attack requires no local access and can be executed entirely through network-based payloads.
Mitigation strategies for this vulnerability should include immediate patch application from the vendor, which would address the buffer overflow through proper input validation and memory management. Network segmentation practices should be implemented to restrict access to TCP port 515, particularly preventing external access to print services. Firewalls should be configured to block inbound connections on port 515 from untrusted networks, while internal access should be limited to authorized users and systems. System administrators should consider disabling unnecessary print services and implementing strict access controls for print queue management. The remediation process should also include monitoring for suspicious network activity on port 515 and implementing intrusion detection systems to identify potential exploitation attempts. Additionally, regular vulnerability assessments should be conducted to identify similar buffer overflow conditions in other network services and applications, as this vulnerability type remains prevalent in legacy systems. Organizations should also consider implementing network access control lists and ensuring that print services operate with minimal necessary privileges to reduce potential impact from successful exploitation attempts.