CVE-2002-1183 in Windows
Summary
by MITRE
Microsoft Windows 98 and Windows NT 4.0 do not properly verify the Basic Constraints of digital certificates, allowing remote attackers to execute code, aka "New Variant of Certificate Validation Flaw Could Enable Identity Spoofing" (CAN-2002-0862).
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Analysis
by VulDB Data Team • 06/22/2025
The vulnerability described in CVE-2002-1183 represents a critical certificate validation flaw affecting Microsoft Windows 98 and Windows NT 4.0 operating systems. This issue stems from inadequate verification of Basic Constraints within digital certificates, creating a pathway for malicious actors to exploit the system's trust mechanisms. The vulnerability operates at the core of public key infrastructure validation, where the operating system fails to properly enforce certificate hierarchy restrictions that are fundamental to maintaining secure communication channels. The flaw allows attackers to craft malicious certificates that appear valid to the system while bypassing essential security checks that should prevent unauthorized certificate issuance.
The technical implementation of this vulnerability lies in the certificate validation process where Windows systems do not adequately enforce the Basic Constraints extension as defined in x509 certificate standards. This extension is designed to indicate whether a certificate is a CA certificate capable of issuing other certificates or a end-entity certificate. When Basic Constraints are not properly verified, an attacker can create a certificate that incorrectly claims CA capabilities while maintaining the appearance of legitimate certification authority status. The flaw specifically affects the certificate chain validation process where intermediate certificates fail to properly validate their parent certificate's authority status, creating a trust chain that can be manipulated.
Operationally, this vulnerability enables remote code execution through identity spoofing attacks that can compromise the integrity of secure communications. Attackers can leverage this flaw to create certificates that appear legitimate to vulnerable Windows systems, potentially allowing them to intercept encrypted communications, perform man-in-the-middle attacks, or establish unauthorized secure connections. The impact extends beyond simple certificate validation failure as it undermines the fundamental security model of public key cryptography, enabling attackers to bypass authentication mechanisms and potentially gain elevated privileges within affected systems. The vulnerability is particularly dangerous in networked environments where certificate-based authentication is used for secure communications.
The mitigation strategies for this vulnerability require immediate patching of affected systems through Microsoft security updates, as the flaw represents a fundamental weakness in certificate validation that cannot be adequately addressed through configuration changes alone. Organizations should implement certificate revocation checking mechanisms and consider deploying additional security layers such as certificate pinning to prevent exploitation. The vulnerability aligns with CWE-311, which addresses the absence of proper certificate validation controls, and maps to ATT&CK technique T1552.001 for unsecured credentials and T1071.004 for application layer protocol traffic. System administrators must ensure that all affected Windows 98 and Windows NT 4.0 systems receive appropriate security updates and that certificate management policies are strengthened to prevent exploitation of similar validation weaknesses in other components.