CVE-2013-6418 in PyWBEM
Summary
by MITRE
PyWBEM 0.7 and earlier uses a separate connection to validate X.509 certificates, which allows man-in-the-middle attackers to spoof a peer via an arbitrary certificate.
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Analysis
by VulDB Data Team • 05/12/2026
The vulnerability identified as CVE-2013-6418 affects PyWBEM versions 0.7 and earlier, presenting a critical security flaw in the certificate validation process of this Python-based web-based enterprise management library. This issue stems from the software's implementation of X.509 certificate validation through a separate connection mechanism rather than integrating validation within the primary communication channel. The flaw creates a window of opportunity for man-in-the-middle attacks where adversaries can successfully spoof legitimate peers by presenting arbitrary certificates that bypass proper authentication checks. This vulnerability directly impacts the integrity and authenticity guarantees that cryptographic protocols are designed to provide, undermining the fundamental security assumptions of the system.
The technical implementation flaw resides in how PyWBEM handles certificate validation by establishing a distinct connection specifically for verification purposes. This separate validation connection creates a potential attack vector where malicious actors can intercept and manipulate the certificate exchange process. The vulnerability is classified under CWE-295 which deals with improper certificate validation, specifically focusing on the weakness in validating certificates against a trusted certificate authority. The separate connection approach removes the cryptographic binding that should exist between the certificate validation and the actual communication channel, allowing attackers to present certificates that would be accepted by the validation connection but not by the primary communication path, creating a false sense of security for the legitimate parties.
Operationally, this vulnerability exposes systems using PyWBEM to significant risks including unauthorized access, data interception, and potential system compromise. Attackers can exploit this flaw to impersonate legitimate management servers or clients, potentially gaining access to sensitive enterprise management data and control functions. The impact extends beyond simple credential theft to include potential disruption of management operations and compromise of the entire enterprise management infrastructure. This vulnerability particularly affects organizations relying on WBEM (Web-Based Enterprise Management) protocols for system monitoring and management, where the integrity of peer authentication is paramount for maintaining secure operations. The attack requires minimal sophistication and can be executed by any attacker with network access to the communication channel, making it highly exploitable in real-world scenarios.
Mitigation strategies for CVE-2013-6418 require immediate upgrades to PyWBEM versions 0.8 and later, which address the certificate validation implementation by integrating proper validation within the primary communication channel. Organizations should also implement additional network-level security controls including firewall rules to restrict access to management interfaces, deployment of network intrusion detection systems to monitor for suspicious certificate exchanges, and regular security audits of management infrastructure. The remediation process should include comprehensive testing of updated systems to ensure that the certificate validation mechanisms function correctly without disrupting legitimate operations. Additionally, organizations should consider implementing certificate pinning mechanisms where possible and establish robust certificate lifecycle management processes to further reduce the attack surface. This vulnerability serves as a reminder of the critical importance of proper cryptographic implementation and the dangers of creating separate validation paths that can be exploited by attackers. The ATT&CK framework categorizes this vulnerability under credential access and defense evasion techniques, highlighting the need for organizations to maintain up-to-date software and implement layered security approaches to protect against such sophisticated attacks.