CVE-2012-2661 in Ruby on Rails
Summary
by MITRE
The Active Record component in Ruby on Rails 3.0.x before 3.0.13, 3.1.x before 3.1.5, and 3.2.x before 3.2.4 does not properly implement the passing of request data to a where method in an ActiveRecord class, which allows remote attackers to conduct certain SQL injection attacks via nested query parameters that leverage unintended recursion, a related issue to CVE-2012-2695.
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Analysis
by VulDB Data Team • 03/25/2021
The vulnerability described in CVE-2012-2661 represents a critical SQL injection flaw within the Active Record component of Ruby on Rails frameworks. This weakness affects versions prior to specific patch releases including 3.0.13, 3.1.5, and 3.2.4, creating a significant security risk for applications relying on these framework versions. The vulnerability stems from improper handling of request data when passing parameters to the where method in ActiveRecord classes, allowing malicious actors to exploit nested query parameters for unauthorized database access.
The technical implementation of this vulnerability involves the recursive processing of nested hash parameters within the ActiveRecord where method. When applications process request data containing nested structures, the framework fails to properly sanitize or escape these parameters before incorporating them into SQL queries. This improper parameter handling creates an injection vector where attackers can manipulate the query structure through crafted nested parameter sequences. The vulnerability specifically leverages the unintended recursion that occurs when processing deeply nested hash structures, enabling attackers to bypass normal input validation mechanisms.
From an operational perspective, this vulnerability enables remote attackers to execute arbitrary SQL commands against affected applications, potentially leading to complete database compromise. Attackers can exploit this flaw to extract sensitive data, modify database contents, or even escalate privileges within the application environment. The impact extends beyond simple data theft as the vulnerability can be used to gain deeper access to underlying system resources and potentially compromise the entire application infrastructure. Organizations running affected Rails versions face significant risk of data breaches and system compromise.
The vulnerability aligns with CWE-89, which categorizes improper neutralization of special elements in SQL commands as a SQL injection weakness, and maps to ATT&CK technique T1071.004 for application layer protocol manipulation. Security practitioners should implement immediate mitigations including upgrading to patched versions of Ruby on Rails, implementing input validation at multiple layers, and conducting thorough code reviews to identify potential parameter handling issues. Additional protective measures include deploying web application firewalls, monitoring for suspicious parameter patterns, and establishing robust database access controls to limit potential damage from successful exploitation attempts.
Organizations should prioritize patch management to upgrade to Rails versions 3.0.13, 3.1.5, or 3.2.4 respectively, as these releases contain the necessary fixes for the parameter handling recursion issue. The mitigation strategy must also include comprehensive testing of all parameter processing code paths to ensure that nested hash structures are properly sanitized before database interaction. Regular security assessments and vulnerability scanning should be implemented to identify any remaining instances of similar parameter handling flaws within the application codebase.