CVE-2000-0750 in NetBSD
Summary
by MITRE
Buffer overflow in mopd (Maintenance Operations Protocol loader daemon) allows remote attackers to execute arbitrary commands via a long file name.
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Analysis
by VulDB Data Team • 04/06/2019
The vulnerability identified as CVE-2000-0750 represents a critical buffer overflow flaw within the mopd daemon, which serves as the Maintenance Operations Protocol loader daemon in certain networked systems. This daemon is responsible for handling maintenance operations and protocol loading functions within network infrastructure components. The buffer overflow occurs specifically when processing file names, where the daemon fails to properly validate input length before copying data into fixed-size buffers. This fundamental flaw in input validation creates an exploitable condition that remote attackers can leverage to execute arbitrary code on the affected system. The vulnerability resides in the daemon's handling of file name parameters, which are processed without adequate bounds checking mechanisms.
The technical exploitation of this buffer overflow vulnerability follows a classic pattern where attackers craft malicious input containing an excessively long file name that exceeds the allocated buffer space. When the mopd daemon attempts to process this oversized input, it overwrites adjacent memory locations, potentially corrupting program execution flow and allowing attackers to inject and execute malicious code. The attack vector is entirely remote, meaning that an attacker does not require local system access or authentication credentials to exploit this vulnerability. The buffer overflow can be triggered through any network interaction that passes file name parameters to the mopd daemon, making it particularly dangerous as it can be exploited from any network location with access to the service. This vulnerability directly maps to CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations.
The operational impact of CVE-2000-0750 extends beyond simple command execution, as successful exploitation can provide attackers with complete control over the affected system. The compromised daemon can serve as a foothold for further network penetration, allowing attackers to establish persistent access, escalate privileges, or use the system as a launching point for attacks against other networked devices. Organizations running vulnerable versions of mopd face significant risk of unauthorized system compromise, data exfiltration, and potential service disruption. The vulnerability's remote exploitability means that attackers can target systems from anywhere on the network, making traditional network segmentation and perimeter security measures insufficient to prevent exploitation. From an attacker's perspective, this vulnerability aligns with ATT&CK technique T1059, which involves executing commands through remote access capabilities, and T1068, which covers privilege escalation techniques that can be facilitated by code execution in system processes.
Mitigation strategies for this vulnerability require immediate implementation of patches provided by the software vendors or system administrators. The most effective approach involves updating the mopd daemon to a version that properly validates input lengths and implements proper buffer management techniques. Network administrators should also implement firewall rules to restrict access to the mopd service to only trusted network segments, while monitoring for suspicious file name patterns that might indicate exploitation attempts. Additionally, system hardening measures should include disabling unnecessary services, implementing intrusion detection systems to monitor for exploitation attempts, and conducting regular vulnerability assessments to identify other potential buffer overflow vulnerabilities in the network infrastructure. Organizations should also establish incident response procedures specifically designed to handle remote code execution vulnerabilities, ensuring that security teams can quickly respond to and contain exploitation attempts. The remediation process must include thorough testing of patches in controlled environments before deployment to production systems to avoid introducing new stability issues while addressing the critical buffer overflow vulnerability.