CVE-2001-0048 in Windows
Summary
by MITRE
The "Configure Your Server" tool in Microsoft 2000 domain controllers installs a blank password for the Directory Service Restore Mode, which allows attackers with physical access to the controller to install malicious programs, aka the "Directory Service Restore Mode Password" vulnerability.
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Analysis
by VulDB Data Team • 04/07/2017
The vulnerability identified as CVE-2001-0048 represents a critical security flaw in Microsoft Windows 2000 domain controllers that stems from improper configuration during the server setup process. This weakness specifically affects the Directory Service Restore Mode (DSRM) password configuration, where the system defaults to a blank password when executing the "Configure Your Server" tool. The flaw demonstrates a fundamental failure in privilege management and authentication controls, creating an exploitable condition that undermines the security posture of domain controller systems. The vulnerability is particularly concerning because it occurs during the initial installation phase, meaning that organizations may unknowingly deploy systems with inherently weak security configurations that persist throughout their operational lifecycle.
The technical implementation of this vulnerability involves the automatic creation of a Directory Service Restore Mode account with an empty password field during the domain controller configuration process. This account is designed for emergency recovery scenarios when normal directory services are unavailable, but the absence of a password creates an unauthenticated access point that bypasses all normal authentication mechanisms. The flaw resides in the Microsoft Windows 2000 Server operating system's installation and configuration routines, specifically within the Active Directory configuration tool that manages the server setup process. When the Configure Your Server wizard executes, it fails to properly enforce password requirements for the DSRM account, resulting in a default blank password that can be exploited by any entity with physical access to the system.
The operational impact of this vulnerability extends far beyond simple privilege escalation, as it provides attackers with unrestricted access to the domain controller's directory services and underlying infrastructure. An attacker with physical access to a compromised domain controller can leverage this blank password to gain full administrative control over the directory service, potentially leading to complete domain compromise and lateral movement throughout the network. This vulnerability directly maps to CWE-259 and CWE-798, which address the use of hard-coded passwords and the presence of default passwords in security-critical systems. The attack vector is particularly dangerous because it requires minimal technical expertise and only physical access to the target system, making it an attractive target for both insider threats and external attackers who have obtained physical access through social engineering or other means.
The implications of this vulnerability align with several ATT&CK framework techniques including T1210 for exploiting weak credentials and T1078 for valid accounts, as the blank password provides legitimate administrative access without the need for complex credential cracking or exploitation techniques. Organizations deploying Windows 2000 domain controllers were left with a system that could be completely compromised simply by an attacker who gained physical access and knew to look for the DSRM account. This vulnerability also demonstrates the importance of secure configuration management and proper security hardening practices, as the default installation process failed to enforce minimum security requirements for critical system accounts. The remediation process requires manual intervention to set a strong password for the DSRM account and proper verification that the password has been correctly applied, highlighting the need for comprehensive security auditing and configuration validation procedures.
Mitigation strategies for this vulnerability include immediate manual password configuration of the Directory Service Restore Mode account, implementation of proper security hardening procedures during system deployment, and regular security auditing to verify that critical accounts maintain appropriate password strength. Organizations should also implement physical security controls to prevent unauthorized access to domain controller systems, as this vulnerability specifically requires physical access to exploit. The incident underscores the importance of security by design principles and the need for automated security controls that prevent dangerous default configurations from being applied during system installation. Regular security training for system administrators should emphasize the critical nature of account management and the potential consequences of leaving default security settings unchanged, particularly for accounts with elevated privileges and emergency access capabilities.