CVE-2012-5786 in CXF
Summary
by MITRE
The wsdl_first_https sample code in distribution/src/main/release/samples/wsdl_first_https/src/main/ in Apache CXF, possibly 2.6.0, does not verify that the server hostname matches a domain name in the subject s Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.
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Analysis
by VulDB Data Team • 08/07/2024
The vulnerability described in CVE-2012-5786 resides within the Apache CXF framework's wsdl_first_https sample code implementation, specifically affecting versions including but potentially extending beyond 2.6.0. This issue represents a critical flaw in SSL/TLS certificate validation mechanisms that undermines the fundamental security assurances provided by secure communication protocols. The vulnerability occurs during the SSL handshake process when the client application fails to perform proper hostname verification against the server certificate presented during the secure connection establishment. This weakness allows attackers to conduct successful man-in-the-middle attacks by presenting a valid SSL certificate that does not match the expected hostname, effectively bypassing the certificate validation process that should prevent such impersonation attempts.
The technical root cause of this vulnerability stems from the absence of proper hostname validation within the SSL/TLS certificate verification routine. In standard secure communication implementations, when a client connects to a server using HTTPS or SSL, the client should verify that the certificate presented by the server matches the hostname being accessed. This verification typically involves checking the Common Name field within the certificate's subject field or the Subject Alternative Name extension, which contains the actual domain names associated with the certificate. The Apache CXF sample code fails to implement this crucial validation step, allowing certificates with mismatched hostnames to be accepted as valid, thereby creating a security loophole that adversaries can exploit.
The operational impact of this vulnerability is severe and far-reaching within enterprise environments that utilize Apache CXF for web service communication. Attackers can leverage this weakness to intercept and manipulate sensitive data transmitted between clients and servers, potentially gaining access to confidential information, credentials, or proprietary business data. The vulnerability particularly affects organizations that rely on the wsdl_first_https sample as a reference implementation for secure web service communication, as it demonstrates a flawed security approach that could be inadvertently adopted in production systems. This weakness essentially undermines the trust model that SSL/TLS protocols are designed to provide, making it possible for malicious actors to impersonate legitimate services without detection.
The vulnerability aligns with CWE-295, which specifically addresses "Improper Certificate Validation," and represents a clear violation of the secure communication principles outlined in industry standards and best practices. From an attack perspective, this weakness maps to ATT&CK technique T1041, which covers "Exfiltration Over C2 Channel," as attackers can use the compromised communication channel to exfiltrate data. Additionally, the vulnerability contributes to broader attack vectors including T1566, "Phishing," and T1071, "Application Layer Protocol," as it enables attackers to establish malicious communication channels that appear legitimate to unsuspecting users. Organizations using affected versions of Apache CXF should immediately implement mitigations including updating to patched versions, implementing custom hostname verification logic, or deploying additional network-level security controls to prevent exploitation of this vulnerability.
The remediation approach involves upgrading to Apache CXF versions that contain proper SSL certificate validation mechanisms, typically through patch releases that address the specific hostname verification flaw. Organizations should also implement comprehensive security testing procedures that include SSL certificate validation checks as part of their application security assessment protocols. Network administrators should consider implementing additional monitoring and detection measures to identify potential exploitation attempts, while development teams should adopt secure coding practices that emphasize proper certificate validation as a fundamental security requirement in all SSL/TLS implementations. The vulnerability serves as a reminder of the critical importance of certificate validation in secure communication protocols and the potential consequences of overlooking this fundamental security control in application development.