Open Redirect Vulnerability in CTFd

Executive Summary

This vulnerability is an open redirect issue in CTFd versions up to 3.8.4. It exists in the _is_safe_url function in CTFd/utils/validators/__init__.py. The vulnerability allows attackers to manipulate the Next parameter to redirect users to malicious websites. The exploit is publicly known and can be used remotely.

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Detection Guidance

This vulnerability involves an open redirect in CTFd versions up to 3.8.4 due to improper validation of the Next parameter in the _is_safe_url function. To detect it, inspect CTFd instances for versions 3.8.4 or earlier. Check for suspicious redirect URLs in web server logs or application traces. No specific commands are provided in the context, but monitoring for unexpected redirects or unusual URL patterns may help identify exploitation attempts.

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Impact Analysis

This vulnerability could allow attackers to trick users into visiting malicious websites by redirecting them from a trusted CTFd instance. Users might unknowingly disclose sensitive information or download malware. The impact is limited as it requires user interaction (clicking a link).

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Compliance Impact

This vulnerability is an open redirect issue in CTFd, which could potentially allow unauthorized redirection of users to malicious sites. While it does not directly expose sensitive data, it may be exploited for phishing or social engineering attacks. Compliance impact depends on context, but it could indirectly affect GDPR by enabling data exposure through deception, or HIPAA by facilitating unauthorized access to systems handling protected health information.

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Mitigation Strategies

Upgrade CTFd to a version that includes the patch 5d8515842fd1ab2c3a9f2dde9ffca907aa334ea9 or later. This addresses the open redirect vulnerability in the _is_safe_url function.

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