CVE-2024-6299 in Conduit
Summary
by MITRE • 06/25/2024
Lack of consideration of key expiry when validating signatures in Conduit, allowing an attacker which has compromised an expired key to forge requests as the remote server, as well as PDUs with timestamps past the expiry date
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Analysis
by VulDB Data Team • 09/20/2024
The vulnerability identified as CVE-2024-6299 represents a critical flaw in Conduit's signature validation mechanism that directly impacts the integrity and authenticity of secure communications. This weakness stems from the system's failure to properly enforce key expiration policies during signature verification processes, creating a window of opportunity for attackers to exploit compromised credentials beyond their intended validity period. The flaw specifically affects scenarios where cryptographic keys have expired but the system continues to accept signatures generated with those keys, undermining the fundamental security assumptions of public key infrastructure implementations.
From a technical perspective, the vulnerability manifests when Conduit validates digital signatures without performing proper key expiration checks. This oversight allows attackers who have gained access to expired private keys to continue generating valid-looking signatures that the system accepts as authentic. The impact extends beyond simple authentication bypasses to include the potential for forging PDUs (Protocol Data Units) with timestamps that exceed the legitimate key expiration dates. This creates a sophisticated attack vector where adversaries can manipulate temporal aspects of communications, potentially enabling replay attacks or time-based privilege escalation. The vulnerability aligns with CWE-327, which addresses the use of weak cryptographic algorithms and improper implementation of cryptographic protocols, and specifically relates to the failure to validate certificate or key expiration dates in signature validation processes.
The operational impact of CVE-2024-6299 is particularly severe as it enables attackers to impersonate legitimate remote servers and manipulate communication flows with temporal validity. An attacker who has compromised an expired key can forge requests that appear to originate from trusted sources, potentially gaining unauthorized access to protected resources or manipulating data flows within the system. The ability to generate valid PDUs with future timestamps creates additional attack surface areas where time-based security controls can be circumvented. This vulnerability directly violates the principles outlined in the NIST SP 800-57 standard for cryptographic key management, which emphasizes the importance of proper key lifecycle management including expiration and revocation procedures. The flaw also corresponds to ATT&CK technique T1556.004, which covers credential harvesting through keylogging and other means, as it allows attackers to extend the usability of compromised credentials beyond their natural expiration periods.
Mitigation strategies for CVE-2024-6299 must address the fundamental validation process by implementing comprehensive key expiration checks during signature verification. Organizations should ensure that all cryptographic signature validation routines include mandatory expiration date verification before accepting any signature as valid. The system should enforce strict timestamp validation that rejects any PDU or request with timestamps that exceed the legitimate key validity period, regardless of the signature's apparent authenticity. Implementing proper key lifecycle management protocols, including automated key rotation and immediate revocation of compromised keys, will help prevent exploitation of this vulnerability. Additionally, security monitoring should be enhanced to detect anomalous signature patterns or temporal inconsistencies that may indicate exploitation attempts. The solution should align with industry best practices established in ISO/IEC 14443 and RFC 5280 standards for certificate validation, ensuring that cryptographic implementations maintain proper temporal integrity controls. Regular security assessments and penetration testing should be conducted to verify that signature validation mechanisms properly enforce key expiration policies and prevent unauthorized access through compromised credentials.