Cross-Site Scripting in Moodle Password Reset

Executive Summary

This vulnerability is a cross-site scripting (XSS) flaw in Moodle. It occurs because the username input on the password reset page is not properly sanitized. An attacker can trick an unauthenticated user into clicking a specially crafted password reset link, which executes arbitrary scripts in the victim's browser.

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Detection Guidance

To detect this XSS vulnerability in Moodle, monitor for unusual activity on the password reset page. Check web server logs for requests containing suspicious username inputs or crafted reset links. Use tools like OWASP ZAP or Burp Suite to scan for XSS vulnerabilities in the password reset functionality.

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Impact Analysis

This vulnerability could lead to the disclosure of sensitive information like session cookies, account compromise, or other malicious activities such as installing malware or redirecting users to malicious sites. It may also allow bypassing protection mechanisms and reading application data.

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Compliance Impact

This XSS vulnerability could lead to unauthorized access to sensitive data, such as session cookies or user credentials, which may violate GDPR's data protection requirements or HIPAA's safeguards for protected health information if exploited in healthcare or EU-based systems.

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Mitigation Strategies

Update Moodle to the latest version to patch this flaw. If an update is unavailable, disable the password reset page temporarily or restrict access to it. Implement input validation and output encoding for username fields on the reset page to prevent XSS attacks.

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