CVE-2012-3464 in Ruby on Rails
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in activesupport/lib/active_support/core_ext/string/output_safety.rb in Ruby on Rails before 3.0.17, 3.1.x before 3.1.8, and 3.2.x before 3.2.8 might allow remote attackers to inject arbitrary web script or HTML via vectors involving a (quote) character.
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Analysis
by VulDB Data Team • 03/27/2021
The CVE-2012-3464 vulnerability represents a critical cross-site scripting flaw within the Ruby on Rails web framework that affected multiple version branches including 3.0.x, 3.1.x, and 3.2.x prior to specific patch releases. This vulnerability resides in the activesupport component, specifically within the core_ext/string/output_safety.rb file which handles output safety mechanisms for string manipulation. The flaw manifests when the framework processes user-supplied input containing quote characters, creating an avenue for malicious actors to inject arbitrary web scripts or HTML content into web applications built on Rails. This type of vulnerability directly violates the fundamental security principle of input validation and sanitization that all web applications must implement to prevent malicious code execution in user browsers.
The technical exploitation of this vulnerability occurs through the improper handling of quote characters within the Rails output safety mechanisms. When user input containing quotes is processed through the affected code path, the framework fails to adequately sanitize or escape these characters before rendering them in web pages. This allows attackers to inject malicious payloads that execute in the context of other users' browsers, potentially leading to session hijacking, data theft, or further exploitation of the application. The vulnerability is classified as a classic XSS attack vector where the quote character serves as the injection point for malicious script execution. According to CWE standards, this represents a CWE-79: Improper Neutralization of Input During Web Page Generation, which is one of the most prevalent and dangerous web application security flaws. The attack pattern aligns with ATT&CK technique T1059.001 for command and script injection, specifically targeting web application interfaces.
The operational impact of CVE-2012-3464 extends far beyond simple data corruption or display issues, as it fundamentally compromises user security and application integrity. Applications utilizing affected Rails versions become vulnerable to persistent XSS attacks that can persist across user sessions and potentially compromise entire user bases. Attackers can leverage this vulnerability to steal session cookies, perform unauthorized actions on behalf of users, redirect users to malicious sites, or even install malware through browser-based exploits. The vulnerability affects not only the core functionality but also undermines the trust relationship between users and web applications, as users may unknowingly execute malicious code when interacting with compromised pages. Organizations running affected versions face significant risk of data breaches, regulatory compliance violations, and reputational damage. The vulnerability's widespread impact stems from Rails' popularity and the fact that many applications rely on the framework's built-in security mechanisms, making this a critical concern for organizations maintaining web applications.
Mitigation strategies for CVE-2012-3464 require immediate action to upgrade affected Rails installations to patched versions, specifically 3.0.17, 3.1.8, or 3.2.8, respectively. Organizations should implement comprehensive input validation and output escaping mechanisms as additional defensive layers, ensuring that all user-supplied data undergoes proper sanitization before being rendered in web pages. The implementation of Content Security Policy headers provides an additional security boundary that can mitigate the impact of successful XSS attacks by restricting script execution. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in web applications, while developers should follow secure coding practices including the use of automatic escaping mechanisms and proper validation of all input data. Organizations should also implement web application firewalls to detect and block suspicious traffic patterns that may indicate XSS attempts, and maintain detailed monitoring of application logs for signs of exploitation attempts. These measures align with industry best practices established by standards such as OWASP Top Ten and NIST cybersecurity guidelines for web application security.