CVE-2010-3299 in Ruby on Rails
Summary
by MITRE
The encrypt/decrypt functions in Ruby on Rails 2.3 are vulnerable to padding oracle attacks.
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Analysis
by VulDB Data Team • 03/07/2025
The vulnerability identified as CVE-2010-3299 represents a critical security flaw in Ruby on Rails version 2.3 that affects the encryption and decryption mechanisms implemented within the framework. This weakness stems from the improper handling of cryptographic padding during the encryption process, creating a scenario where attackers can exploit the system through padding oracle attacks. The vulnerability specifically impacts applications that rely on Rails' built-in encryption features, making it particularly dangerous for web applications that process sensitive data such as user credentials, personal information, or financial details. The flaw exists in the underlying cryptographic implementation that was designed to provide data confidentiality but instead creates an attack surface that adversaries can leverage to compromise encrypted data.
The technical root cause of this vulnerability lies in how Rails 2.3 handles padding validation during the decryption process. When the system encounters improperly padded data, it provides different error responses depending on whether the padding is valid or invalid. This differential response creates a padding oracle that attackers can exploit through repeated decryption attempts, systematically determining the plaintext content of encrypted data without possessing the encryption keys. The vulnerability operates under the principles of cryptographic side-channel analysis, where the timing and nature of error responses reveal information about the internal cryptographic state. This type of attack is classified under the Common Weakness Enumeration category CWE-310, which specifically addresses cryptographic weaknesses related to improper implementation of cryptographic functions. The attack pattern aligns with techniques described in the MITRE ATT&CK framework under the T1552.004 sub-technique for "Unsecured Credentials" and T1071.004 for "Application Layer Protocol: DNS" when these attacks are used to exfiltrate information through cryptographic vulnerabilities.
The operational impact of CVE-2010-3299 extends beyond simple data exposure, as it can enable attackers to perform more sophisticated attacks including session hijacking, credential theft, and data manipulation. Applications using Rails 2.3 that implement encryption for user sessions, cookies, or database fields become vulnerable to these attacks, potentially allowing unauthorized access to user accounts and sensitive information. The vulnerability is particularly concerning because it affects the fundamental security mechanisms of the framework, meaning that any application relying on Rails' encryption features is at risk. Attackers can leverage this weakness to decrypt session tokens, user passwords, or other sensitive data that has been encrypted using the vulnerable implementation. The impact is amplified in environments where applications store personal identifiable information, financial data, or other regulated information that requires strong cryptographic protection.
Mitigation strategies for this vulnerability require immediate action including upgrading to a patched version of Ruby on Rails, specifically versions 2.3.9 or later, which contain the necessary cryptographic fixes. Organizations should also implement proper key rotation procedures and ensure that all applications using Rails 2.3 are migrated to supported versions as soon as possible. Additional defensive measures include monitoring for unusual error patterns in application logs that might indicate padding oracle attack attempts, implementing rate limiting on cryptographic operations, and using alternative encryption libraries that do not exhibit this vulnerability. The remediation process should involve thorough code reviews to identify all instances where Rails encryption functions are used, particularly in session management and data storage components. Security teams should also consider implementing network-level protections and intrusion detection systems that can identify and block padding oracle attack patterns. Organizations must prioritize this vulnerability as high-risk due to its potential for data breach and unauthorized access, and should conduct comprehensive security assessments to ensure all affected applications are properly patched and secured.