CVE-2001-1302 in Windows
Summary
by MITRE
The change password option in the Windows Security interface for Windows 2000 allows attackers to use the option to attempt to change passwords of other users on other systems or identify valid accounts by monitoring error messages, possibly due to a problem in the NetuserChangePassword function.
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Analysis
by VulDB Data Team • 04/07/2017
The vulnerability described in CVE-2001-1302 represents a critical weakness in the Windows 2000 security architecture that exploits the password change functionality within the Windows Security interface. This flaw specifically targets the NetuserChangePassword function which is responsible for managing user password modifications across networked systems. The vulnerability stems from insufficient validation and authorization checks within the password change process, allowing unauthorized users to manipulate the system's authentication mechanisms. Attackers can leverage this weakness to either attempt password changes on accounts belonging to other users or to enumerate valid user accounts by observing specific error messages returned by the system. The issue is particularly dangerous because it operates at the interface level where legitimate administrative functions are exposed, making it difficult to distinguish between authorized and malicious activity. This vulnerability directly impacts the principle of least privilege by allowing lateral movement and account compromise through seemingly benign administrative functions.
The technical implementation of this vulnerability exploits the inherent design flaw in how Windows 2000 handles password change requests across network boundaries. When users attempt to change passwords through the graphical interface, the underlying NetuserChangePassword function fails to properly validate whether the requesting user has adequate permissions to modify the target account. This lack of proper access control validation creates an opportunity for attackers to submit password change requests for accounts they do not own, effectively bypassing the normal authentication and authorization procedures. The system's response to these unauthorized attempts provides attackers with valuable feedback through error messages that can reveal whether a target account exists on the system. This information disclosure aspect of the vulnerability is particularly concerning as it enables account enumeration attacks that can be used to build comprehensive lists of valid usernames for further exploitation attempts. The vulnerability is classified under CWE-284 Access Control Issues, specifically addressing insufficient access control mechanisms that allow unauthorized access to privileged functions.
The operational impact of CVE-2001-1302 extends beyond simple account compromise to encompass broader security implications for Windows 2000 environments. Attackers can utilize this vulnerability to perform reconnaissance activities by systematically testing various usernames against the password change interface, effectively mapping user accounts within the network. Once valid accounts are identified, attackers can attempt to change passwords for these accounts, potentially gaining unauthorized access to systems, resources, and sensitive data. The vulnerability is particularly dangerous in environments where users have access to the Windows Security interface and where network connectivity exists between systems. This weakness enables attackers to perform privilege escalation attacks by changing passwords for high-value accounts or administrative accounts, potentially leading to complete system compromise. The vulnerability also facilitates account takeover scenarios where attackers can lock out legitimate users by changing their passwords or gain persistent access by creating accounts with elevated privileges. According to ATT&CK framework, this vulnerability maps to T1078 Valid Accounts and T1566 Phishing, as it enables attackers to obtain valid credentials and leverage them for further infiltration activities.
Mitigation strategies for CVE-2001-1302 should focus on implementing proper access controls and network segmentation to limit exposure to this vulnerability. Organizations should ensure that only authorized users have access to the Windows Security interface and that proper authentication mechanisms are in place before allowing any password change operations. Network administrators should implement firewall rules to restrict access to systems that expose the vulnerable password change functionality, particularly in environments where users may have access to the graphical interface. The most effective long-term solution involves applying security patches and updates provided by Microsoft to address the underlying flaw in the NetuserChangePassword function. Additionally, implementing account lockout policies and monitoring for unusual password change activities can help detect potential exploitation attempts. Security awareness training should emphasize the importance of proper access control and the risks associated with unauthorized access to system administration functions. Organizations should also consider implementing multi-factor authentication mechanisms to add additional layers of security beyond simple password validation, reducing the impact of credential compromise resulting from this vulnerability. The vulnerability demonstrates the critical importance of proper access control implementation and the potential consequences of inadequate authorization checking in system interfaces.