CVE-2012-6496 in Ruby on Rails
Summary
by MITRE
SQL injection vulnerability in the Active Record component in Ruby on Rails before 3.0.18, 3.1.x before 3.1.9, and 3.2.x before 3.2.10 allows remote attackers to execute arbitrary SQL commands via a crafted request that leverages incorrect behavior of dynamic finders in applications that can use unexpected data types in certain find_by_ method calls.
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Analysis
by VulDB Data Team • 05/02/2019
The CVE-2012-6496 vulnerability represents a critical sql injection flaw within the active record component of ruby on rails framework affecting multiple version streams including 3.0.x before 3.0.18, 3.1.x before 3.1.9, and 3.2.x before 3.2.10. this vulnerability specifically targets the dynamic finder methods that applications utilize to construct sql queries based on user input. the flaw arises from improper handling of data types within find_by_ method calls, creating an avenue for malicious actors to manipulate sql query construction through crafted requests that exploit unexpected data type behavior. the vulnerability falls under the common weakness enumeration category of cwe-89 sql injection as it enables attackers to inject malicious sql code that gets executed by the database server. from an operational perspective this vulnerability poses significant risk to applications using ruby on rails as it allows remote attackers to execute arbitrary sql commands without authentication, potentially leading to complete database compromise, data exfiltration, and unauthorized access to sensitive information. the attack vector leverages the dynamic nature of ruby on rails finders where method parameters are directly incorporated into sql queries without proper sanitization, particularly when applications expect certain data types but receive unexpected ones that alter sql query construction. the impact extends beyond simple data theft as attackers can perform destructive operations including data modification, deletion, and even privilege escalation within the database environment. organizations running affected ruby on rails versions face potential exposure to advanced persistent threats where attackers can establish backdoors, create new user accounts, or modify application logic through direct database manipulation.
The technical exploitation of CVE-2012-6496 demonstrates how dynamic method invocation in ruby on rails can create dangerous injection points when input validation is insufficient. attackers can craft requests that manipulate the find_by_ methods to inject malicious sql fragments, bypassing normal security controls and authorization mechanisms. the vulnerability operates through the framework's automatic sql query generation where method names like find_by_email or find_by_username are dynamically converted into sql queries, and the improper handling of parameter types allows attackers to inject sql syntax that gets executed as part of the constructed query. this flaw aligns with attack techniques documented in the mitre attack framework under the execution and privilege escalation domains, specifically targeting the database layer through application-level vulnerabilities. the vulnerability's exploitation requires minimal privileges since it operates at the application layer and can be executed remotely without requiring direct system access. the affected applications typically process user input through dynamic finders that do not properly escape or validate data types, creating a path for attackers to inject malicious sql code that gets interpreted by the database engine. this represents a classic example of insecure data handling in web applications where user input directly influences sql query construction without adequate sanitization or parameterization.
Mitigation strategies for CVE-2012-6496 primarily involve immediate version upgrades to patched ruby on rails releases, specifically upgrading to 3.0.18, 3.1.9, or 3.2.10 respectively. organizations should implement comprehensive input validation and parameterization practices to prevent similar vulnerabilities in their applications, ensuring that all user inputs are properly sanitized before being used in sql queries. the ruby on rails community has documented this vulnerability extensively and recommends implementing proper security controls including the use of prepared statements and parameterized queries to prevent sql injection attacks. additional defensive measures include implementing web application firewalls, monitoring for suspicious sql query patterns, and conducting regular security assessments of application code to identify potential injection points. organizations should also consider implementing database activity monitoring solutions that can detect and alert on suspicious sql injection attempts. the vulnerability serves as a reminder of the importance of proper input validation and parameterization in web application development, particularly when utilizing dynamic query building features that automatically construct sql from user-provided data. security teams should prioritize patch management processes to ensure timely deployment of security updates, as this vulnerability has been widely exploited in the wild and represents a significant risk to organizations using unpatched ruby on rails applications. the remediation process should include thorough code reviews to identify other potential injection points and implementation of security coding practices that prevent similar vulnerabilities from emerging in future application development cycles.