CVE-2002-0699 in Windows
Summary
by MITRE
Unknown vulnerability in the Certificate Enrollment ActiveX Control in Microsoft Windows 98, Windows 98 Second Edition, Windows Millennium, Windows NT 4.0, Windows 2000, and Windows XP allow remote attackers to delete digital certificates on a user s system via HTML.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 09/14/2025
This vulnerability resides within the Certificate Enrollment ActiveX control component of Microsoft Windows operating systems spanning multiple versions including Windows 98, Windows 98 Second Edition, Windows Millennium, Windows NT 4.0, Windows 2000, and Windows XP. The flaw manifests as an insufficient access control mechanism that permits remote attackers to manipulate digital certificates stored on user systems through specially crafted HTML content. The ActiveX control, designed to facilitate certificate enrollment processes, contains a critical design flaw that allows unauthorized deletion of certificate files without proper authentication or authorization checks. This vulnerability represents a classic example of insecure direct object reference where the control fails to validate user permissions before executing certificate modification operations.
The technical exploitation occurs when a remote attacker crafts HTML content that references the vulnerable ActiveX control and triggers certificate deletion functionality. The vulnerability stems from improper input validation and lack of privilege separation within the control's implementation. Attackers can leverage this weakness by embedding malicious ActiveX code within web pages or email attachments that, when viewed by unsuspecting users, automatically execute certificate deletion commands. The flaw operates at the system level where the control performs certificate operations without adequate verification of the executing user's privileges or the legitimacy of the requested operations. This represents a fundamental failure in the principle of least privilege and demonstrates poor secure coding practices in the ActiveX component's architecture.
The operational impact of this vulnerability is significant as it enables attackers to compromise the integrity of the certificate store on affected systems, potentially leading to authentication failures, man-in-the-middle attacks, and complete certificate-based security system compromise. Once an attacker successfully deletes certificates, they may be able to impersonate legitimate users, bypass authentication mechanisms, or prevent legitimate certificate usage for secure communications. The vulnerability affects systems where users have administrative privileges or where the ActiveX control is configured to run with elevated permissions. This creates a substantial risk for enterprise environments where certificate-based authentication is prevalent, as the deletion of critical certificates can render security systems ineffective and compromise the entire infrastructure's trust model.
Mitigation strategies should focus on immediate patch deployment through Microsoft security updates, which address the underlying access control flaws in the Certificate Enrollment ActiveX control. System administrators should disable or restrict ActiveX control execution in web browsers, particularly for certificate-related functionality, and implement strict browser security policies that prevent automatic execution of potentially malicious ActiveX components. The implementation of proper certificate management policies, including regular certificate backups and monitoring for unauthorized certificate modifications, should be established. Organizations should also consider network segmentation and firewall rules to limit exposure of systems running vulnerable versions of Windows, while ensuring that users are educated about the risks of visiting untrusted websites. This vulnerability aligns with CWE-284 (Improper Access Control) and can be mapped to ATT&CK technique T1195 (Supply Chain Compromise) when considering the exploitation through web-based attack vectors. The remediation process must include comprehensive system auditing to identify and restore any deleted certificates, along with enhanced monitoring for suspicious certificate modification activities.