CVE-2001-0668 in HP-UX
Summary
by MITRE
Buffer overflow in line printer daemon (rlpdaemon) in HP-UX 10.01 through 11.11 allows remote attackers to execute arbitrary commands.
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Analysis
by VulDB Data Team • 10/05/2025
The vulnerability identified as CVE-2001-0668 represents a critical buffer overflow flaw within the line printer daemon component of HP-UX operating systems. This issue affects versions ranging from 10.01 through 11.11, making it a widespread concern across multiple iterations of the HP-UX platform. The rlpdaemon service, responsible for managing line printer operations, contains a flaw that can be exploited by remote attackers to gain unauthorized system access and execute malicious code with elevated privileges.
The technical nature of this vulnerability stems from improper input validation within the rlpdaemon application. When processing incoming network requests related to printer operations, the daemon fails to adequately check buffer boundaries, allowing attackers to overflow memory buffers and overwrite critical system data structures. This classic buffer overflow condition occurs when user-supplied input exceeds the allocated buffer space, potentially corrupting adjacent memory locations and enabling attackers to manipulate program execution flow. The flaw specifically manifests during the handling of printer job submissions or status queries that are transmitted over network connections.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with complete system control capabilities. Remote exploitation allows malicious actors to execute arbitrary commands with the privileges of the rlpdaemon process, which typically runs with elevated permissions. This access can lead to unauthorized data access, system compromise, and potential lateral movement within network environments where HP-UX systems are deployed. The vulnerability's remote exploitability makes it particularly dangerous as attackers do not require physical access or local system credentials to leverage the flaw.
Security professionals should consider this vulnerability in the context of the CWE-121 buffer overflow category, which encompasses run-time errors where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The attack surface aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as successful exploitation enables arbitrary command execution. Organizations should prioritize immediate patching of affected HP-UX systems, as the vulnerability has been widely documented and exploited in the wild. Network segmentation and firewall rules should be implemented to restrict unnecessary printer service access, while monitoring systems should be configured to detect unusual printer daemon activity. The vulnerability highlights the importance of maintaining up-to-date security patches and implementing proper input validation controls in network services to prevent similar buffer overflow exploits from compromising system integrity.