CVE-2013-6444 in PyWBEM
Summary
by MITRE
PyWBEM 0.7 and earlier 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 • 05/12/2026
The vulnerability identified as CVE-2013-6444 affects PyWBEM versions 0.7 and earlier, representing a critical flaw in the secure communication handling of the Python WBEM (Web-Based Enterprise Management) client library. This issue stems from inadequate SSL/TLS certificate validation mechanisms within the library's implementation, creating a significant security risk that undermines the fundamental security guarantees of encrypted communications. The vulnerability specifically targets the hostname verification process that should occur during SSL/TLS handshakes, where the client validates that the server's certificate is issued for the domain it is connecting to.
The technical flaw manifests in the library's failure to properly validate X.509 certificates against the expected server hostname. During SSL/TLS connections, standard security protocols require that the certificate presented by the server contains a Common Name (CN) field or Subject Alternative Name (SAN) field that matches the domain name being accessed. This validation prevents attackers from successfully impersonating legitimate servers using fraudulent certificates. However, PyWBEM 0.7 and earlier versions bypass this crucial verification step, allowing attackers to present any valid certificate regardless of whether it corresponds to the target server's domain. This omission creates a man-in-the-middle attack vector where adversaries can intercept and modify communications between the client and server without detection.
The operational impact of this vulnerability extends beyond simple communication interception, as it fundamentally compromises the security posture of systems relying on PyWBEM for enterprise management operations. Organizations using affected versions of the library are exposed to potential data breaches, unauthorized access to management interfaces, and complete compromise of their WBEM-based infrastructure. The vulnerability affects any application or system that utilizes PyWBEM for remote management of enterprise resources, including servers, storage systems, and network devices that depend on WBEM protocols for monitoring and configuration management. Attackers exploiting this weakness can gain unauthorized access to sensitive management interfaces, potentially leading to complete system compromise and data exfiltration.
Security professionals should note that this vulnerability aligns with CWE-295, which specifically addresses "Improper Certificate Validation," and represents a classic example of insufficient hostname verification in SSL/TLS implementations. The flaw also maps to ATT&CK technique T1046, which involves the use of network service scanning to identify and exploit vulnerable systems. Mitigation strategies should include immediate upgrading to PyWBEM versions 0.8 or later where this certificate validation has been properly implemented. Organizations should also implement additional security controls such as certificate pinning, network segmentation, and monitoring for unauthorized certificate usage. The vulnerability demonstrates the critical importance of proper SSL/TLS implementation in security-sensitive applications and underscores the necessity of thorough security testing and validation of cryptographic libraries before deployment in production environments.