CVE-2023-39231 in PingOne MFA Integration Kit
Summary
by MITRE • 10/25/2023
PingFederate using the PingOne MFA adapter allows a new MFA device to be paired without requiring second factor authentication from an existing registered device. A threat actor may be able to exploit this vulnerability to register their own MFA device if they have knowledge of a victim user's first factor credentials.
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Analysis
by VulDB Data Team • 11/15/2023
This vulnerability exists within PingFederate's implementation of the PingOne Multi-Factor Authentication adapter where the system fails to enforce proper second factor authentication during the registration of new MFA devices. The flaw represents a critical weakness in the authentication flow that undermines the fundamental security principle of multi-factor authentication by allowing attackers to bypass the requirement for existing device verification when adding new authentication factors. The vulnerability specifically affects scenarios where an attacker possesses valid first factor credentials for a target user account, enabling them to register additional MFA devices without validating their access through previously registered devices.
The technical implementation flaw stems from improper validation of the device pairing process within the authentication adapter. When a user attempts to register a new MFA device, the system should require authentication through an existing registered device before allowing the new device to be paired. However, the PingFederate implementation fails to enforce this requirement, creating a pathway for unauthorized device registration. This vulnerability is classified under CWE-305 Authentication Bypass Through Multiple Means, which specifically addresses scenarios where authentication mechanisms can be bypassed through manipulation of the authentication flow or by exploiting weak validation controls. The flaw essentially creates a race condition or validation gap in the MFA registration workflow that allows attackers to manipulate the system into accepting new device registrations without proper second factor verification.
The operational impact of this vulnerability is significant and directly affects the security posture of organizations relying on PingFederate for identity management and multi-factor authentication. Attackers with knowledge of valid user credentials can escalate their access privileges by registering their own MFA devices, effectively bypassing the second factor protection that was intended to secure user accounts. This creates a persistent threat vector where attackers can maintain access to compromised accounts even after the initial breach, as they now have legitimate MFA devices registered to those accounts. The vulnerability is particularly concerning in enterprise environments where privileged accounts may be targeted, as it allows attackers to establish long-term access without detection. This weakness aligns with ATT&CK technique T1566.002 for credential harvesting and T1566.003 for phishing attacks, as it enables adversaries to maintain access through legitimate authentication mechanisms.
Organizations should implement immediate mitigations including strengthening the authentication flow validation, implementing additional verification steps for device registration, and monitoring for unusual device registration patterns. The recommended approach involves configuring the PingFederate system to enforce strict second factor authentication during all MFA device registration attempts, regardless of whether the user has authenticated through the first factor. Security teams should also implement behavioral analytics to detect anomalous device registration activities, particularly when new devices are added to accounts with no prior device history or when registration occurs from unusual geographic locations or network segments. Additionally, organizations should review their MFA policies and ensure that device registration requires explicit verification through existing registered devices, effectively closing the gap in the authentication process that this vulnerability exploits. The fix should align with security standards such as NIST SP 800-63B which provides guidelines for authentication and lifecycle management of authentication factors, ensuring that device registration processes maintain the integrity of the multi-factor authentication framework.