CVE-2012-5822 in Zamboni
Summary
by MITRE
The contribution feature in Zamboni 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, related to use of the Python urllib2 library.
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Analysis
by VulDB Data Team • 03/15/2019
The vulnerability described in CVE-2012-5822 represents a critical SSL certificate validation flaw within the Zamboni contribution feature that directly impacts the security of HTTPS communications. This issue stems from improper hostname verification during SSL/TLS certificate validation processes, specifically within the Python urllib2 library implementation. The vulnerability creates a dangerous condition where the system accepts any valid SSL certificate without properly validating that the certificate's hostname matches the expected domain name, effectively undermining the fundamental security guarantees that SSL/TLS protocols are designed to provide.
The technical flaw manifests when the contribution feature processes SSL connections and fails to perform proper certificate hostname verification against either the Common Name field or the Subject Alternative Name fields within X.509 certificates. This misconfiguration allows attackers to conduct successful man-in-the-middle attacks by presenting any valid certificate, regardless of whether it was issued for the target domain. The vulnerability specifically targets the Python urllib2 library's handling of SSL connections, which is commonly used in web applications for making HTTP requests to external services. This weakness creates a path for attackers to intercept and potentially modify communications between the application and its external services, including payment processing systems and other sensitive endpoints.
The operational impact of this vulnerability is severe and far-reaching for organizations using the affected Zamboni platform. Attackers can exploit this weakness to impersonate legitimate servers and potentially intercept sensitive data such as user credentials, payment information, and other confidential communications. The vulnerability essentially nullifies the security benefits of SSL/TLS encryption by allowing certificate forgery to succeed without detection, making it particularly dangerous for financial transactions and user authentication processes. Organizations may experience data breaches, financial losses, and regulatory compliance violations as a result of this vulnerability being exploited in the wild.
The security implications of CVE-2012-5822 align with CWE-295, which specifically addresses improper certificate validation, and relates to ATT&CK technique T1046 for network service scanning and T1566 for credential harvesting through man-in-the-middle attacks. Effective mitigation strategies must include updating the Python urllib2 library to versions that properly implement hostname verification, configuring explicit certificate validation routines, and implementing additional security controls such as certificate pinning for critical connections. Organizations should also consider implementing network monitoring to detect unusual SSL certificate behavior and establish proper certificate management processes to ensure that only trusted certificates are accepted for critical services. The vulnerability underscores the importance of proper SSL/TLS implementation and highlights the critical need for robust certificate validation mechanisms in all network communications.