CVE-2014-7143 in Python Twisted
Summary
by MITRE
Python Twisted 14.0 trustRoot is not respected in HTTP client
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Analysis
by VulDB Data Team • 11/26/2024
The vulnerability identified as CVE-2014-7143 affects Python Twisted version 14.0 and relates to improper handling of SSL/TLS certificate validation within the HTTP client component. This issue stems from the trustRoot parameter not being properly respected during SSL certificate verification processes, potentially allowing malicious actors to bypass certificate validation mechanisms. The flaw exists in the twisted.web.client module which is commonly used for making HTTP requests in Python applications that require secure communications. When developers configure SSL context with specific trust roots or certificate authorities, the system should enforce these restrictions to ensure only trusted certificates are accepted. However, in this case, the trustRoot configuration is ignored, creating a potential security gap in applications relying on Twisted for secure HTTP communications. This vulnerability directly impacts the integrity of SSL/TLS connections and can lead to man-in-the-middle attacks where attackers can present fraudulent certificates that would otherwise be rejected by proper certificate validation.
The technical implementation flaw occurs at the SSL context validation layer within Twisted's HTTP client implementation. When an HTTP request is made with SSL/TLS enabled, the client should consult the trustRoot parameter to determine which certificate authorities are acceptable for validation. The vulnerability manifests when the trustRoot configuration is specified but ignored during the certificate verification process, allowing connections to proceed even when certificates don't match the expected trust boundaries. This issue is particularly concerning because it affects the fundamental security mechanism of certificate validation in secure communications. The flaw can be exploited by attackers who present certificates signed by untrusted authorities or certificates that should not be accepted according to the application's security policy. The vulnerability is classified as a weakness in certificate validation and can be mapped to CWE-295 which addresses improper certificate validation, and also relates to CWE-310 which covers cryptographic issues.
The operational impact of CVE-2014-7143 extends beyond simple certificate validation failures and represents a significant risk to applications that depend on secure HTTP communications. Applications using Twisted for web scraping, API integration, or any scenario requiring HTTPS connections may be vulnerable to attacks that exploit this flaw. The vulnerability allows attackers to potentially intercept or manipulate secure communications without detection, undermining the confidentiality and integrity of data transmitted over HTTPS. Organizations using Python applications built on Twisted that make HTTPS requests are at risk, particularly those in regulated industries where proper certificate validation is mandatory for compliance. The attack surface is broad since many applications use Twisted for HTTP client functionality, making this vulnerability potentially widespread across different software ecosystems. This weakness can be leveraged by attackers to establish unauthorized connections to malicious servers or to perform certificate pinning bypasses that would normally be prevented by proper trustRoot enforcement.
Mitigation strategies for CVE-2014-7143 require immediate attention from system administrators and developers who use Twisted in their applications. The primary recommendation is to upgrade to a patched version of Twisted that properly implements trustRoot validation for HTTP client connections. Organizations should conduct vulnerability assessments to identify all applications using affected versions of Twisted and prioritize remediation efforts accordingly. Additionally, developers should implement additional security controls such as certificate pinning, explicit certificate validation checks, or alternative HTTP client libraries that properly enforce trust boundaries. The implementation of network monitoring and anomaly detection can help identify potential exploitation attempts. Security teams should also review their certificate management policies and ensure that proper certificate validation procedures are in place even when relying on third-party libraries. For organizations unable to immediately upgrade, temporary workarounds such as implementing custom certificate validation logic or using proxy servers with proper SSL inspection capabilities may provide interim protection. This vulnerability demonstrates the critical importance of proper SSL/TLS implementation in network security and highlights the need for regular security assessments of third-party libraries used in application development. The ATT&CK framework categorizes this vulnerability under T1046 Network Service Scanning and T1566 Impersonation, as it enables attackers to establish unauthorized secure connections and potentially impersonate legitimate services through certificate validation bypass techniques.