CVE-2012-5814 in Gaug.es
Summary
by MITRE
Weberknecht, as used in GitHub Gaug.es and other products, 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.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 03/15/2019
The vulnerability described in CVE-2012-5814 represents a critical SSL/TLS certificate validation flaw that affects the Weberknecht library implementation in various security-sensitive applications including GitHub Gaug.es. This issue stems from improper certificate verification mechanisms that fail to properly validate the server hostname against the certificate's subject common name or subject alternative name fields. The vulnerability specifically targets the SSL/TLS handshake process where client applications should verify that the certificate presented by the server corresponds to the expected domain name. When this validation is omitted or incorrectly implemented, attackers can exploit the weakness to perform man-in-the-middle attacks by presenting any valid SSL certificate that does not match the intended server hostname. This flaw directly violates fundamental security principles of certificate-based authentication and trust establishment in secure communications.
The technical implementation of this vulnerability occurs at the certificate validation layer where the Weberknecht library fails to perform proper hostname verification as mandated by standard SSL/TLS protocols. According to the x509 standard and industry best practices, when establishing secure connections, client applications must verify that the certificate's subject common name or subject alternative name fields contain a domain name that matches the hostname being connected to. The absence of this verification creates a trust relationship that can be easily exploited by attackers who possess valid certificates but are not the legitimate server operators. This flaw essentially allows attackers to impersonate legitimate servers without needing to compromise the actual server's private keys, making it particularly dangerous for applications that rely on SSL/TLS for data protection and authentication. The vulnerability maps to CWE-295 which specifically addresses improper certificate validation and represents a direct violation of the TLS protocol's security requirements.
The operational impact of this vulnerability extends beyond simple data interception to encompass complete trust relationship compromise and potential credential theft. Attackers can leverage this weakness to redirect traffic through malicious servers, capture sensitive information transmitted over the secure channel, or even perform session hijacking attacks against authenticated applications. For GitHub Gaug.es and similar products, this vulnerability could enable attackers to intercept analytics data, user information, or other sensitive metrics that would otherwise be protected by SSL/TLS encryption. The implications are particularly severe for web analytics platforms that may handle sensitive business data or user privacy information, as the vulnerability allows attackers to establish false trust relationships without detection. This type of vulnerability is categorized under the MITRE ATT&CK framework as part of the credential access and defense evasion techniques, specifically targeting the initial access and persistence phases where attackers establish secure communication channels with compromised systems.
Mitigation strategies for CVE-2012-5814 require immediate implementation of proper hostname verification mechanisms within the Weberknecht library and affected applications. Organizations should ensure that all SSL/TLS implementations properly validate certificate hostnames against the expected domain names using standard verification procedures. The fix involves implementing certificate validation logic that checks both the subject common name and subject alternative name fields of certificates against the target hostname, following RFC 2818 and RFC 6125 standards. Additionally, security teams should consider implementing certificate pinning mechanisms where applications maintain a trusted list of certificate fingerprints or public keys for specific domains. Regular security audits should verify that all SSL/TLS implementations properly validate certificates and that hostname verification is enabled and functioning correctly. Organizations using affected products should upgrade to patched versions of the Weberknecht library or implement alternative SSL/TLS validation mechanisms to prevent exploitation of this vulnerability that could lead to complete system compromise and data breaches.