CVE-2004-0004 in OpenCA
Summary
by MITRE
The libCheckSignature function in crypto-utils.lib for OpenCA 0.9.1.6 and earlier only compares the serial of the signer s certificate and the one in the database, which can cause OpenCA to incorrectly accept a signature if the certificate s chain is trusted by OpenCA s chain directory, allowing remote attackers to spoof requests from other users.
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Analysis
by VulDB Data Team • 12/15/2024
The vulnerability identified as CVE-2004-0004 resides within the OpenCA cryptographic utilities library version 0.9.1.6 and earlier, specifically in the libCheckSignature function that handles certificate signature validation. This flaw represents a critical weakness in the certificate validation process that undermines the fundamental security assumptions of public key infrastructure. The vulnerability stems from an incomplete certificate verification mechanism that fails to perform comprehensive validation checks, instead relying solely on serial number comparison between the signer's certificate and database entries. This limited validation approach creates a significant security gap that can be exploited by malicious actors to bypass proper authentication mechanisms.
The technical flaw manifests as a failure to implement proper certificate chain validation procedures, which is a core requirement according to established security standards such as those outlined in the Common Weakness Enumeration (CWE-295) for improper certificate validation. The vulnerability specifically targets the certificate verification process by only comparing certificate serial numbers without ensuring the certificate chain is properly trusted or that the certificate has not been revoked. This approach violates fundamental principles of certificate-based authentication systems where multiple validation checks including chain of trust, revocation status, and proper signature verification should be performed. The weakness allows an attacker to potentially use a certificate with a matching serial number from a different user's certificate, effectively enabling identity spoofing attacks against the OpenCA system.
The operational impact of this vulnerability is severe as it enables remote attackers to spoof authentication requests from other users within the OpenCA environment. This represents a direct compromise of the system's integrity and authentication mechanisms, potentially allowing unauthorized access to protected resources and services. The vulnerability can be exploited by attackers who obtain a certificate with a matching serial number from the database, even if that certificate is not legitimately associated with the intended user or system. This flaw essentially undermines the trust model that OpenCA relies upon for secure certificate management and cryptographic operations, potentially leading to unauthorized certificate issuance, data tampering, and privilege escalation attacks.
The security implications extend beyond simple authentication bypass to encompass broader certificate management failures that could affect the entire OpenCA infrastructure. Attackers could leverage this vulnerability to forge signatures, impersonate legitimate users, and potentially gain access to sensitive cryptographic operations within the system. This vulnerability aligns with ATT&CK framework techniques related to credential access and privilege escalation, specifically targeting the credential validation processes. Organizations using affected OpenCA versions should immediately implement mitigations including updating to patched versions, implementing additional verification layers, and conducting comprehensive security audits of certificate management processes. The vulnerability demonstrates the critical importance of comprehensive certificate validation procedures and highlights the risks associated with incomplete cryptographic verification implementations in security-critical systems.