Executive Summary

This vulnerability exists in the Two-Factor Authentication (2FA) verification component of Nagios Fusion versions 2024R1.2 and 2024R2. It is caused by a lack of rate limiting and account lockout controls on the OTP (One-Time Password) verification endpoint, allowing attackers to perform unlimited brute-force attempts to guess OTPs. As a result, attackers can bypass 2FA protections and gain unauthorized access to sensitive accounts, including administrator accounts. [1]

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Impact Analysis

This vulnerability can allow attackers to bypass the 2FA security mechanism by brute-forcing OTPs without restriction. This can lead to unauthorized access to sensitive accounts, including administrator accounts, potentially resulting in mass account takeovers or targeted attacks on high-value accounts. The impact includes compromise of confidentiality, integrity, and limited availability of affected systems. [1]

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Detection Guidance

This vulnerability can be detected by monitoring the OTP verification endpoint (e.g., /verify-otp) for an unusually high number of OTP submission attempts without rate limiting or account lockouts. Detection can involve analyzing logs for repeated failed OTP attempts from the same account or IP address. Specific commands are not provided in the resources, but network or application log inspection focusing on the 2FA verification requests and their frequency would be key. [1]

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Mitigation Strategies

Immediate mitigation steps include enforcing strict rate limiting on OTP attempts per account, IP, or device; implementing account lockouts after a defined number of failed OTP submissions requiring re-authentication; and introducing back-off delays such as exponential delays on repeated failures. Additionally, updating Nagios Fusion to version 2024R2.1 or later, where the vulnerability is patched, is strongly recommended. [1]

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