CVE-2013-3221 in Ruby on Rails
Summary
by MITRE
The Active Record component in Ruby on Rails 2.3.x, 3.0.x, 3.1.x, and 3.2.x does not ensure that the declared data type of a database column is used during comparisons of input values to stored values in that column, which makes it easier for remote attackers to conduct data-type injection attacks against Ruby on Rails applications via a crafted value, as demonstrated by unintended interaction between the "typed XML" feature and a MySQL database.
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Analysis
by VulDB Data Team • 02/02/2026
The vulnerability described in CVE-2013-3221 represents a critical data-type injection flaw within the Active Record component of Ruby on Rails frameworks version 2.3.x through 3.2.x. This issue stems from the framework's failure to enforce proper data type validation during database comparisons, creating a pathway for malicious actors to manipulate application behavior through carefully crafted input values. The vulnerability specifically manifests when the framework processes input values against stored database values without maintaining strict adherence to the declared column data types, thereby undermining the integrity of database operations.
The technical flaw exploits the interaction between Ruby on Rails' "typed XML" feature and MySQL database systems, where the framework's type coercion mechanism fails to properly validate input data against the expected column types. This creates a scenario where attackers can inject values that bypass normal type checking mechanisms, allowing them to manipulate database queries through unexpected type conversion behaviors. The vulnerability leverages the inherent differences in how Ruby handles data types versus how MySQL processes them, creating opportunities for attackers to craft inputs that appear valid but trigger unintended database operations.
From an operational impact perspective, this vulnerability enables remote attackers to conduct sophisticated data-type injection attacks against affected applications, potentially leading to unauthorized data access, data manipulation, or even complete system compromise. The flaw particularly affects applications that rely heavily on XML processing and database interactions, as the typed XML feature becomes a vector for exploitation. Attackers can exploit this weakness to bypass security controls, manipulate query results, or gain insights into database structures through carefully constructed input sequences that exploit the type coercion inconsistencies.
The vulnerability aligns with CWE-20, "Improper Input Validation," and CWE-129, "Improper Validation of Array Index," as it involves inadequate validation of input data types during database operations. From an ATT&CK framework perspective, this vulnerability maps to T1071.004, "Application Layer Protocol: XML, JSON, and Other Protocol Analysis," and T1210, "Exploitation of Remote Services," as it enables attackers to exploit application-level protocol handling and remote service vulnerabilities through crafted input manipulation. Organizations using affected Ruby on Rails versions should prioritize immediate patching and implementation of proper input validation measures to prevent exploitation of this vulnerability.
Mitigation strategies should include upgrading to patched versions of Ruby on Rails 3.2.13 or later, implementing strict input validation at all application layers, and configuring proper type checking mechanisms in database interactions. Security teams should also conduct comprehensive code reviews focusing on database query construction and input handling, particularly in areas utilizing XML processing features. Additionally, network segmentation and monitoring solutions should be deployed to detect anomalous database access patterns that might indicate exploitation attempts. Organizations should consider implementing automated vulnerability scanning tools that can identify applications running vulnerable versions of Ruby on Rails and flag potential exploitation vectors related to data-type handling.