CVE-2016-6317 in Ruby on Rails
Summary
by MITRE
Action Record in Ruby on Rails 4.2.x before 4.2.7.1 does not properly consider differences in parameter handling between the Active Record component and the JSON implementation, which allows remote attackers to bypass intended database-query restrictions and perform NULL checks or trigger missing WHERE clauses via a crafted request, as demonstrated by certain "[nil]" values, a related issue to CVE-2012-2660, CVE-2012-2694, and CVE-2013-0155.
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Analysis
by VulDB Data Team • 09/15/2022
The vulnerability identified as CVE-2016-6317 represents a critical security flaw within the Ruby on Rails framework that specifically affects versions 4.2.x prior to 4.2.7.1. This issue stems from a fundamental inconsistency in how the Active Record component processes database queries compared to the JSON implementation, creating a dangerous discrepancy that malicious actors can exploit to circumvent intended security controls. The flaw manifests when processing parameter values, particularly those containing null or empty array elements, allowing attackers to manipulate database query execution paths in ways that were never intended by the application developers.
The technical core of this vulnerability lies in the improper handling of parameter serialization and deserialization between the Active Record query interface and JSON parsing mechanisms. When Ruby on Rails processes incoming requests containing specific parameter structures such as "[nil]" values, the framework fails to maintain consistent interpretation of these parameters across different processing layers. This inconsistency creates a pathway where attackers can craft malicious requests that bypass authentication checks, authorization controls, and data validation mechanisms that should normally prevent certain database operations. The vulnerability operates at the intersection of multiple security controls, effectively allowing remote attackers to perform unauthorized database operations that would normally be restricted.
From an operational impact perspective, this vulnerability poses significant risks to applications built on Ruby on Rails that process user input through database queries. Attackers can leverage this flaw to perform unauthorized NULL checks, manipulate WHERE clause conditions, and potentially access or modify data that should be protected by application-level security controls. The vulnerability's relationship to previous CVEs including CVE-2012-2660, CVE-2012-2694, and CVE-2013-0155 indicates a persistent pattern in Rails' parameter handling that has required multiple patches over time, highlighting the ongoing challenges in maintaining secure parameter processing across different framework components. This type of vulnerability directly impacts the integrity and confidentiality of database operations, potentially leading to data breaches, unauthorized access to sensitive information, and complete compromise of database-level security controls.
The mitigation strategy for CVE-2016-6317 requires immediate application updates to Ruby on Rails version 4.2.7.1 or later, which contains the necessary patches to normalize parameter handling between Active Record and JSON implementations. Organizations should also implement comprehensive input validation and sanitization measures to reduce the attack surface, while monitoring for anomalous database query patterns that might indicate exploitation attempts. Security teams should conduct thorough vulnerability assessments of all Rails applications to identify potential exposure to similar parameter handling issues, and consider implementing web application firewalls or additional layers of protection to detect and block malicious parameter structures. This vulnerability aligns with CWE-20, which describes improper input validation, and maps to ATT&CK techniques involving command and control through database manipulation, emphasizing the need for layered defensive strategies to protect against such exploitation vectors.