CVE-2007-4594 in Entelligence Security Provider
Summary
by MITRE
Entrust Entelligence Security Provider (ESP) 8 does not properly validate certificates in certain circumstances involving (1) a chain that omits the root Certification Authority (CA) certificate, or an application that specifies disregarding (2) unknown revocation statuses during path validation or (3) certain errors in the certification path, which might allow context-dependent attackers to spoof certificate authentication. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
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Analysis
by VulDB Data Team • 11/01/2017
The vulnerability described in CVE-2007-4594 affects Entrust Entelligence Security Provider version 8, a cryptographic security component that handles certificate validation and authentication processes. This flaw represents a significant weakness in the certificate chain validation mechanism that could be exploited by malicious actors to bypass security controls. The vulnerability specifically manifests when the security provider encounters certificate chains that lack the root CA certificate or when applications explicitly choose to ignore unknown revocation statuses during path validation. The issue stems from insufficient certificate validation logic that fails to properly enforce security policies even when certificate chains are incomplete or contain errors. This weakness creates a potential attack surface where adversaries could present fraudulent certificates that appear valid to the system, thereby undermining the fundamental trust model that certificate-based authentication relies upon.
The technical implementation flaw in this vulnerability aligns with CWE-295, which addresses improper certificate validation, and demonstrates how incomplete certificate chain validation can lead to authentication bypass scenarios. When certificate chains are missing root CA certificates, or when the system is configured to disregard unknown revocation statuses, the validation process becomes susceptible to manipulation by attackers who can construct certificate chains that meet the minimum validation requirements while still being fraudulent. The vulnerability operates at the certificate path validation layer where the security provider should enforce strict validation rules but instead allows potentially compromised certificate chains to be accepted. This behavior creates a dangerous condition where certificate-based authentication systems can be deceived without proper detection, as the system fails to properly validate the completeness and authenticity of the certificate chain presented by clients or servers.
The operational impact of this vulnerability extends beyond simple authentication bypass scenarios to encompass broader security implications for systems relying on Entrust ESP 8 for certificate validation. Attackers could potentially impersonate legitimate entities by presenting carefully crafted certificate chains that exploit the validation weaknesses, leading to man-in-the-middle attacks, unauthorized access to sensitive systems, or data interception. The context-dependent nature of this vulnerability means that exploitation requires specific conditions to be met, such as the presence of incomplete certificate chains or explicit configuration settings that disable certain validation checks. Organizations using this security provider may experience undetected security breaches where attackers successfully authenticate using fraudulent certificates that would normally be rejected by proper validation mechanisms. This vulnerability particularly impacts environments where certificate-based authentication is critical for security, such as secure web communications, email encryption, and enterprise network access controls.
Mitigation strategies for this vulnerability should focus on implementing proper certificate validation policies and ensuring that all certificate chains include complete trust paths with root CA certificates. System administrators should configure applications to enforce strict revocation checking and avoid disabling validation mechanisms that could be exploited. The recommended approach involves updating to newer versions of the Entrust ESP software that address these validation weaknesses, implementing additional certificate validation layers, and monitoring certificate usage for unusual patterns that might indicate exploitation attempts. Security teams should also consider implementing certificate pinning mechanisms and additional authentication controls to reduce the impact of potential certificate-based attacks. Organizations should review their certificate management practices to ensure that all certificate chains are complete and that validation policies are properly enforced, aligning with best practices outlined in cybersecurity frameworks such as those recommended by NIST and the CWE guidelines for certificate validation and trust management.