Reflected XSS in AVideo Login Page

Executive Summary

This is a reflected cross-site scripting (XSS) vulnerability in AVideo's userLogin.php file. It allows unauthenticated attackers to inject malicious JavaScript by exploiting the error parameter. Attackers craft URLs with script breakout sequences like </script> to execute arbitrary code in victims' browsers when they access the login page.

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Detection Guidance

To detect this reflected XSS vulnerability, monitor network traffic for requests to userLogin.php with an error parameter containing script tags or breakout sequences like </script>. Use tools like curl to test the endpoint with a payload such as: curl 'http://target.com/userLogin.php?error=%3C/script%3E%3Cscript%3Ealert(1)%3C/script%3E'. If the response executes the script, the vulnerability is present.

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Impact Analysis

An attacker could steal session cookies, perform actions on your behalf, redirect you to phishing sites, or capture login credentials. Since it requires user interaction (visiting a malicious link), the impact depends on whether you click such a link while logged into AVideo.

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Compliance Impact

This XSS vulnerability could lead to unauthorized data access or modification, violating GDPR's integrity and confidentiality principles. For HIPAA, it may compromise protected health information if exploited. Organizations using AVideo must address this to maintain compliance.

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Mitigation Strategies

Immediately update AVideo to the latest version where the issue is patched. As a temporary fix, replace addslashes() with htmlspecialchars() or json_encode() in userLogin.php to properly escape input. Disable or restrict access to userLogin.php if an update is not immediately possible.

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