Executive Summary

CVE-2024-55374 is a vulnerability in Redcap version 14.3.13 that allows an attacker to enumerate usernames. This happens because the application returns different error messages depending on whether a username exists or not during login attempts. Although there is a protection mechanism to mitigate brute-force attacks, it inadvertently allows attackers to confirm valid usernames by observing these discrepancies in responses. [1]

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Impact Analysis

This vulnerability can impact you by allowing attackers to discover valid usernames in your Redcap system. Once attackers know valid usernames, they can target those accounts with further attacks such as password guessing or phishing, increasing the risk of unauthorized access and potential data breaches. [1]

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Detection Guidance

This vulnerability can be detected by observing the responses to multiple HTTP authentication requests to the Redcap 14.3.13 login interface. Specifically, sending login attempts with different usernames and analyzing the error messages can reveal discrepancies that indicate valid usernames. Using tools like curl or automated scripts to send these requests and compare responses can help detect user enumeration. [1]

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Mitigation Strategies

Immediate mitigation steps include reviewing and modifying the login error messages to ensure they are uniform regardless of whether a username exists, thereby preventing attackers from distinguishing valid users. Additionally, implementing rate limiting or account lockout mechanisms can reduce the effectiveness of brute-force attacks exploiting this vulnerability. [1]

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