CVE-2012-5825 in Kronolith
Summary
by MITRE
Tweepy 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 httplib library.
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Analysis
by VulDB Data Team • 03/22/2019
The vulnerability identified as CVE-2012-5825 represents a critical SSL certificate validation flaw within the Tweepy Python library that enables man-in-the-middle attacks by bypassing essential certificate verification mechanisms. This weakness stems from the library's improper implementation of SSL certificate validation, specifically failing to verify that the server hostname matches either the Common Name field or the Subject Alternative Name fields within the X.509 certificate structure. The vulnerability directly impacts the security of applications that rely on Tweepy for Twitter API interactions, as it allows attackers to establish fraudulent SSL connections using valid certificates without proper domain validation. This flaw essentially undermines the fundamental purpose of SSL/TLS encryption by enabling attackers to impersonate legitimate Twitter servers and intercept or manipulate communications between client applications and Twitter's API endpoints.
The technical implementation of this vulnerability resides in the underlying Python httplib library usage within Tweepy's SSL connection handling code. When Tweepy establishes HTTPS connections to Twitter's API servers, it fails to perform hostname verification against the certificate presented by the server, creating an opening for attackers to deploy certificate spoofing attacks. The vulnerability manifests because the library does not enforce the standard SSL certificate validation procedure that should confirm the certificate's subject matches the target hostname, which is a core security control defined in industry standards including RFC 2818 and RFC 6125. This oversight allows attackers to generate valid SSL certificates for arbitrary domains and use them to intercept communications, as the library accepts any valid certificate without proper hostname validation. The flaw represents a classic example of insufficient certificate validation, which is categorized under CWE-295 in the Common Weakness Enumeration catalog, specifically addressing improper certificate validation.
The operational impact of CVE-2012-5825 extends beyond simple data interception to encompass potential credential theft, data manipulation, and complete loss of confidentiality for applications using the vulnerable Tweepy library. Attackers can exploit this vulnerability to capture sensitive information transmitted through Twitter API calls, including OAuth tokens, user credentials, and private data. The vulnerability affects any application that uses Tweepy for Twitter API integration and has not implemented additional security measures to compensate for the missing hostname verification. From an attacker's perspective, this vulnerability aligns with techniques described in the MITRE ATT&CK framework under the T1566 technique for credential harvesting through man-in-the-middle attacks, as it provides a pathway for unauthorized access to authentication tokens and sensitive data. The attack vector is particularly concerning because it requires minimal sophistication to exploit, making it a preferred target for automated attack tools and less technically skilled threat actors.
Mitigation strategies for CVE-2012-5825 require both immediate remediation and long-term architectural improvements to secure SSL communications within applications using Tweepy. The primary solution involves updating to a newer version of Tweepy that implements proper SSL certificate validation or manually implementing hostname verification in the application code before establishing connections. Organizations should also consider implementing additional security layers such as certificate pinning, where applications explicitly trust specific certificate fingerprints rather than relying on standard certificate authorities. The vulnerability highlights the importance of following security best practices outlined in NIST SP 800-52 for SSL/TLS implementation and certificate management. Security teams should monitor for applications using vulnerable versions of Tweepy and ensure that all SSL/TLS connections perform proper hostname verification, as specified in RFC 2818 and RFC 6125 standards. Additionally, network-level security controls such as SSL inspection and certificate monitoring tools can help detect and prevent exploitation attempts, though these measures should complement rather than replace proper application-level certificate validation.