CVE-2000-0235 in FreeBSD
Summary
by MITRE
Buffer overflow in the huh program in the orville-write package allows local users to gain root privileges.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 04/21/2026
The vulnerability identified as CVE-2000-0235 represents a critical buffer overflow flaw within the huh program component of the orville-write package, a collection of utilities for the linux operating system. This particular buffer overflow occurs in a local privilege escalation scenario where unprivileged users can exploit the vulnerability to elevate their privileges to root level access. The orville-write package was designed to provide various text processing and document formatting capabilities, but the huh program contained a programming error that created an exploitable condition in its memory handling mechanisms.
The technical flaw manifests when the huh program processes user input without proper bounds checking, allowing an attacker to overflow a fixed-size buffer allocated on the stack. This buffer overflow condition occurs during the processing of command line arguments or input data, where the program fails to validate the length of incoming data before copying it into a predetermined buffer space. When the input exceeds the buffer capacity, it overwrites adjacent memory locations including the return address on the stack, which can be manipulated to redirect program execution to malicious code. This particular vulnerability is classified under CWE-121 as a stack-based buffer overflow, which is a common attack vector that has been documented extensively in cybersecurity literature.
The operational impact of this vulnerability is severe as it enables local privilege escalation attacks that can compromise the entire system. An attacker with regular user privileges can craft malicious input that triggers the buffer overflow, potentially leading to complete system compromise. Once the program executes with elevated privileges, the attacker gains root access to the system, which allows them to modify system files, install backdoors, escalate further to other systems, and perform other malicious activities that would otherwise be restricted to authorized administrators. The vulnerability is particularly dangerous because it does not require network access or remote exploitation, making it a significant concern for local system security.
The exploitation of this vulnerability aligns with several tactics described in the attack framework, particularly those involving privilege escalation techniques. This flaw demonstrates how seemingly benign utility programs can contain critical security vulnerabilities that can be leveraged for system compromise. From a defensive standpoint, this vulnerability underscores the importance of proper input validation and memory management practices in software development. The recommended mitigations include applying the appropriate security patches provided by the software vendor, implementing proper bounds checking in all input processing functions, and conducting thorough security reviews of system utilities. Additionally, system administrators should ensure that all packages are kept up to date with security patches and consider implementing additional security controls such as privilege separation and input sanitization to prevent similar issues from occurring in other applications. This vulnerability serves as a classic example of why secure coding practices are essential in preventing buffer overflow exploits that can lead to complete system compromise.