CVE-2001-0551 in HP-UX
Summary
by MITRE
Buffer overflow in CDE Print Viewer (dtprintinfo) allows local users to execute arbitrary code by copying text from the clipboard into the Help window.
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Analysis
by VulDB Data Team • 12/26/2024
The vulnerability identified as CVE-2001-0551 represents a critical buffer overflow flaw within the Common Desktop Environment (CDE) Print Viewer component known as dtprintinfo. This issue specifically affects the Help window functionality where text copied from the clipboard is processed without adequate bounds checking. The vulnerability resides in the desktop environment's print management system which was widely deployed across unix and linux systems during the late 1990s and early 2000s. The CDE Print Viewer component served as an interface for managing print jobs and system printing configurations, making it a potentially attractive target for attackers seeking to compromise desktop environments.
The technical implementation of this buffer overflow occurs when the dtprintinfo application handles clipboard data within its Help window context. When users copy text from the clipboard and paste it into the Help window, the application fails to validate the length of the incoming data against the allocated buffer space. This lack of input sanitization creates an exploitable condition where an attacker can craft malicious clipboard content that exceeds the buffer capacity, leading to memory corruption. The vulnerability is classified as a classic stack-based buffer overflow according to CWE-121, which occurs when insufficient bounds checking allows data to overwrite adjacent memory locations including return addresses and function pointers. The flaw demonstrates poor defensive programming practices that violate fundamental security principles of input validation and memory safety.
The operational impact of this vulnerability extends beyond simple local privilege escalation as it provides attackers with a means to execute arbitrary code with the privileges of the user running the dtprintinfo application. Since CDE was commonly used in enterprise environments and often ran with elevated privileges, successful exploitation could potentially lead to complete system compromise. Attackers could leverage this vulnerability to gain unauthorized access to sensitive system resources, modify critical system files, or establish persistent backdoors. The local nature of the exploit means that an attacker would need physical access or existing user credentials to initiate the attack, but once exploited, the consequences could be severe given the privileged context in which the print viewer typically operates. This vulnerability aligns with ATT&CK technique T1068 which covers local privilege escalation through software vulnerabilities.
Mitigation strategies for CVE-2001-0551 require immediate patching of affected systems with vendor-provided security updates. System administrators should prioritize updating the CDE components, particularly the dtprintinfo application, to versions that implement proper input validation and bounds checking mechanisms. The recommended approach involves implementing defensive programming practices such as using safe string handling functions, implementing proper buffer size validation, and employing stack canaries or other memory protection techniques. Additionally, organizations should consider disabling or restricting access to the affected Print Viewer component when it is not essential for business operations. Network segmentation and access controls can help limit the potential impact of exploitation, while regular security audits should verify that no other similar buffer overflow vulnerabilities exist within the desktop environment. The vulnerability highlights the importance of maintaining up-to-date desktop environments and demonstrates how seemingly minor interface components can contain critical security flaws that affect entire system security postures.