CVE-2000-0294 in healthd
Summary
by MITRE
Buffer overflow in healthd for FreeBSD allows local users to gain root privileges.
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Analysis
by VulDB Data Team • 04/21/2026
The vulnerability identified as CVE-2000-0294 represents a critical buffer overflow flaw within the healthd daemon running on FreeBSD operating systems. This daemon is responsible for monitoring system health and performing various administrative functions, making it a prime target for privilege escalation attacks. The buffer overflow occurs when the healthd service processes input data without proper bounds checking, allowing malicious local users to overwrite adjacent memory locations and potentially execute arbitrary code with elevated privileges.
The technical implementation of this vulnerability stems from inadequate input validation within the healthd service code. When the daemon receives specially crafted input through its communication channels, it fails to verify the length of incoming data before copying it into fixed-size buffers. This classic programming error enables attackers to exceed buffer boundaries and corrupt memory structures, including return addresses and function pointers. The flaw specifically manifests when the daemon handles certain health monitoring parameters or configuration data, creating opportunities for stack-based buffer overflow conditions that can be exploited by local attackers.
From an operational perspective, this vulnerability presents a significant risk to FreeBSD systems since it allows local users to escalate their privileges to root level without requiring authentication. The attack vector is particularly concerning because it does not require network access or remote exploitation capabilities, meaning any user with local login access can potentially leverage this vulnerability. The impact extends beyond simple privilege escalation to encompass complete system compromise, as root access provides unrestricted control over system resources, file access, and network operations. Organizations running FreeBSD systems are particularly vulnerable if they have multiple local users or if the system is used in multi-user environments where privilege separation is not properly enforced.
Mitigation strategies for CVE-2000-0294 should focus on immediate patch application from FreeBSD security advisories, which would address the underlying buffer overflow conditions through proper input validation and bounds checking mechanisms. System administrators should also implement additional security controls such as restricting local user access where possible, monitoring for unusual healthd daemon behavior, and ensuring proper privilege separation between user processes and system monitoring services. The vulnerability aligns with CWE-121, which categorizes buffer overflow conditions as a fundamental weakness in software design, and could be mapped to ATT&CK technique T1068, which covers privilege escalation through local exploits. Regular security auditing and code review practices should be implemented to identify similar buffer overflow vulnerabilities in other system components, particularly those handling untrusted input data. Organizations should also consider implementing intrusion detection systems that can monitor for suspicious activity related to the healthd daemon and ensure that all system services are regularly updated to address known vulnerabilities in the FreeBSD ecosystem.