CVE-2012-6134 in omniauth-oauth2 gem
Summary
by MITRE
Cross-site request forgery (CSRF) vulnerability in the omniauth-oauth2 gem 1.1.1 and earlier for Ruby allows remote attackers to hijack the authentication of users for requests that modify session state.
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Analysis
by VulDB Data Team • 01/02/2022
The CVE-2012-6134 vulnerability represents a critical cross-site request forgery flaw within the omniauth-oauth2 gem version 1.1.1 and earlier, affecting ruby applications that implement oauth2 authentication mechanisms. This vulnerability resides in the authentication flow where the gem fails to properly validate the origin of authentication requests, creating a pathway for malicious actors to exploit user sessions. The flaw specifically impacts applications using the omniauth framework for oauth2 authentication, making it particularly dangerous for web applications that rely on third-party authentication services such as google facebook or github. The vulnerability allows remote attackers to craft malicious requests that appear to originate from legitimate users, enabling unauthorized actions within the authenticated session context.
The technical implementation of this csrf vulnerability stems from inadequate protection mechanisms within the omniauth-oauth2 gem's authentication handling process. When users authenticate through oauth2 providers, the gem should validate that requests come from legitimate sources and contain proper authentication tokens. However, version 1.1.1 and earlier failed to implement robust csrf token validation or referer header checking, leaving applications vulnerable to attacks where attackers can forge requests that modify session state. This flaw operates at the application layer and specifically targets the authentication flow, making it particularly insidious as it exploits the trust relationship between the application and its users. The vulnerability is classified under CWE-352, which specifically addresses cross-site request forgery conditions, and aligns with ATT&CK technique T1566.002 which covers credential access through social engineering and web-based attacks.
The operational impact of this vulnerability extends beyond simple session hijacking, as it enables attackers to perform unauthorized modifications to user sessions and potentially gain elevated privileges within affected applications. Attackers can exploit this flaw to perform actions such as changing user passwords, modifying account settings, or accessing restricted resources without proper authorization. The vulnerability affects any ruby application using the omniauth-oauth2 gem for authentication, making it particularly concerning for web applications that handle sensitive user data or provide administrative functions. The attack vector is typically executed through crafted html forms or javascript that automatically submits requests to the vulnerable application, leveraging the user's existing authenticated session to perform malicious actions.
Mitigation strategies for CVE-2012-6134 require immediate attention from system administrators and developers. The primary solution involves upgrading the omniauth-oauth2 gem to version 1.1.2 or later, where the csrf protection mechanisms have been properly implemented. Additionally, developers should implement additional csrf protection measures such as validating referer headers, implementing proper csrf tokens, and ensuring that authentication requests are properly validated before processing. Organizations should conduct comprehensive security audits of all ruby applications using omniauth components and ensure that all dependencies are updated to their latest secure versions. The vulnerability demonstrates the importance of maintaining up-to-date dependencies and implementing robust authentication validation mechanisms as outlined in security best practices and standards such as those recommended by the owasp foundation. Regular security monitoring and vulnerability scanning should be implemented to identify and remediate similar issues before they can be exploited by malicious actors.