CVE-2002-0378 in LPRng
Summary
by MITRE
The default configuration of LPRng print spooler in Red Hat Linux 7.0 through 7.3, Mandrake 8.1 and 8.2, and other operating systems, accepts print jobs from arbitrary remote hosts.
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Analysis
by VulDB Data Team • 09/18/2025
The vulnerability described in CVE-2002-0378 represents a critical security flaw in the LPRng print spooler implementation across multiple Linux distributions. This issue stems from the default configuration of the Line Printer Remote protocol daemon which fails to properly restrict incoming print job connections, allowing unauthorized remote hosts to submit print jobs to the system. The affected versions include Red Hat Linux 7.0 through 7.3 and Mandrake 8.1 and 8.2, indicating this was a widespread configuration issue that impacted numerous systems during that era. The vulnerability operates at the network level, specifically targeting the print spooling service that handles print job queuing and processing for networked printers.
The technical flaw manifests as a lack of proper access control mechanisms within the LPRng service configuration. By default, the print spooler listens for incoming connections from any remote host without implementing authentication or authorization checks, effectively creating an open door for malicious actors to submit print jobs. This misconfiguration allows attackers to exploit the service by sending print jobs directly to the target system, potentially leading to various security implications including resource exhaustion, unauthorized printing of sensitive documents, and potential privilege escalation opportunities. The vulnerability is classified under CWE-284, which addresses improper access control issues, and represents a classic case of insufficient input validation and access restriction mechanisms.
The operational impact of this vulnerability extends beyond simple unauthorized printing activities. Attackers can leverage this flaw to consume system resources through excessive print job submission, potentially causing denial of service conditions that prevent legitimate users from accessing printing services. Additionally, the vulnerability creates opportunities for information disclosure if sensitive documents are printed to shared or unsecured printer queues. The attack surface is particularly concerning in enterprise environments where print servers are often accessible from multiple network segments, and the default configuration means that administrators may be unaware of the security risk until exploitation occurs. This vulnerability aligns with ATT&CK technique T1078 which covers valid accounts and legitimate credentials for persistence and privilege escalation.
Mitigation strategies for CVE-2002-0378 require immediate configuration changes to restrict remote access to the LPRng service. System administrators should modify the print spooler configuration files to implement proper access controls, typically by specifying authorized host lists or implementing network segmentation to limit which systems can submit print jobs. The recommended approach involves configuring the service to only accept connections from trusted network segments or implementing proper authentication mechanisms before allowing print job submissions. Additionally, organizations should conduct comprehensive audits of their print server configurations to identify and remediate similar issues across their infrastructure. The vulnerability highlights the importance of secure default configurations and demonstrates how seemingly innocuous services can become significant security risks when improperly configured. Regular security assessments and network monitoring should be implemented to detect unauthorized access attempts to print services and ensure that proper access controls remain in place.