CVE-2012-3458 in Beaker
Summary
by MITRE
Beaker before 1.6.4, when using PyCrypto to encrypt sessions, uses AES in ECB cipher mode, which might allow remote attackers to obtain portions of sensitive session data via unspecified vectors.
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Analysis
by VulDB Data Team • 12/13/2021
The vulnerability identified as CVE-2012-3458 represents a critical cryptographic flaw in the Beaker web application framework that affected versions prior to 1.6.4. This issue specifically impacts applications that utilize PyCrypto for session encryption, creating a significant security risk due to the improper implementation of encryption algorithms. The flaw resides in the session management component of Beaker, which is commonly used in Python web applications for handling user sessions and maintaining state across HTTP requests.
The technical root cause of this vulnerability stems from the use of Advanced Encryption Standard (AES) in Electronic Codebook (ECB) mode for session data encryption. ECB mode processes data in fixed-size blocks without incorporating any chaining mechanism or initialization vector, which fundamentally compromises the security properties of encryption. This cryptographic implementation flaw directly violates established security best practices and is classified under CWE-327, which addresses the use of insecure cryptographic algorithms. The absence of proper randomization in ECB mode means that identical plaintext blocks will always produce identical ciphertext blocks, creating patterns that can be exploited by attackers to infer information about the encrypted session data.
The operational impact of this vulnerability is substantial as it provides remote attackers with the capability to reconstruct portions of sensitive session data through unspecified attack vectors that leverage the predictable nature of ECB encryption. Attackers can potentially perform pattern analysis and statistical attacks against the encrypted session data, particularly when session information contains repetitive or predictable elements such as user IDs, timestamps, or structured data formats. This weakness enables adversaries to gain unauthorized access to session tokens, user credentials, or other sensitive information that should remain protected through proper encryption. The vulnerability aligns with ATT&CK technique T1552.001, which covers unsecured credentials and credential access through cryptographic weaknesses.
Organizations utilizing Beaker frameworks with PyCrypto encryption should immediately implement mitigations to address this vulnerability. The primary remediation involves upgrading to Beaker version 1.6.4 or later, which incorporates proper encryption implementations using secure modes such as CBC or GCM instead of ECB. Additionally, administrators should review their session management configurations to ensure that encryption algorithms meet current security standards and consider implementing additional security controls such as session token rotation, secure cookie attributes, and proper session timeout mechanisms. The fix addresses the underlying cryptographic weakness by ensuring that each encryption operation includes proper initialization vectors and chaining mechanisms that prevent pattern recognition attacks. Security teams should also conduct comprehensive audits of their web application frameworks to identify other potential instances of insecure cryptographic implementations that may expose similar vulnerabilities.