CVE-2000-0005 in HP-UX
Summary
by MITRE
HP-UX aserver program allows local users to gain privileges via a symlink attack.
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Analysis
by VulDB Data Team • 04/18/2026
The vulnerability identified as CVE-2000-0005 affects Hewlett-Packard's HP-UX operating system and specifically targets the aserver program. This issue represents a classic privilege escalation vulnerability that exploits weaknesses in how the system handles symbolic links during file operations. The flaw exists within the program's implementation of file access controls and directory traversal mechanisms, creating an avenue for local attackers to elevate their privileges from standard user level to administrative access. The vulnerability stems from improper handling of symbolic link references in the aserver program's file processing routines.
The technical implementation of this vulnerability involves a race condition or insecure file handling pattern where the aserver program performs operations that do not properly validate or resolve symbolic links before executing file access operations. Attackers can create malicious symbolic links in directories that the aserver program accesses, then manipulate the program's execution flow to traverse these links and gain unauthorized access to protected resources. This type of attack falls under the category of symlink-based privilege escalation attacks and demonstrates poor input validation practices in the system's file handling mechanisms. The vulnerability is particularly concerning because it allows local users to exploit a program that likely runs with elevated privileges, creating a direct path to privilege escalation.
The operational impact of this vulnerability is significant as it enables any local user on an HP-UX system to potentially gain root or administrative privileges without requiring authentication or specialized tools. This creates a severe security risk in environments where multiple users share the same system, as the vulnerability can be exploited to bypass access controls and execute arbitrary code with elevated privileges. The attack vector is relatively simple to implement, requiring only basic file system manipulation capabilities and knowledge of the target program's behavior. Organizations running HP-UX systems are particularly vulnerable if they have the affected aserver program installed and running with elevated privileges, as this creates an immediate and persistent threat vector.
Mitigation strategies for this vulnerability should focus on immediate patching and system hardening measures. System administrators should apply the relevant security patches provided by Hewlett-Packard to address the specific implementation flaws in the aserver program. Additionally, implementing proper file system access controls and ensuring that symbolic link resolution is properly validated before file operations can prevent exploitation. The principle of least privilege should be enforced by running the aserver program with minimal required permissions rather than elevated privileges. Organizations should also consider implementing monitoring solutions to detect suspicious symbolic link creation patterns and file access anomalies. This vulnerability aligns with CWE-59 and CWE-284 categories, representing weaknesses in file system handling and privilege management. The attack pattern corresponds to techniques described in the MITRE ATT&CK framework under privilege escalation tactics, specifically targeting local account exploitation methods.