Compliance Impact

This vulnerability allows an unauthenticated attacker to execute arbitrary JavaScript in the context of every connected user, including administrators. This can lead to universal account takeover, session theft, and execution of privileged actions.

Such security breaches can result in unauthorized access to sensitive personal data and administrative controls, which may violate data protection regulations like GDPR and HIPAA that require safeguarding user data and ensuring system integrity.

Therefore, the vulnerability poses a significant risk to compliance with these standards by potentially exposing confidential information and compromising system security.

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Executive Summary

This vulnerability exists in the WWBN AVideo platform, specifically in versions 29.0 and prior. The YPTSocket plugin's WebSocket server relays attacker-supplied JSON message bodies to all connected clients without sanitizing the 'msg' or 'callback' fields.

On the client side, the script 'plugin/YPTSocket/script.js' uses two eval() functions that directly execute these unsanitized fields. Because tokens for anonymous visitors are minted and never revalidated beyond decryption, an unauthenticated attacker can broadcast arbitrary JavaScript code.

This malicious JavaScript executes in the origin of every connected user, including administrators, enabling universal account takeover, session theft, and execution of privileged actions.

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Impact Analysis

The vulnerability allows an unauthenticated attacker to execute arbitrary JavaScript code in the context of every connected user, including administrators.

• Universal account takeover
• Session theft
• Execution of privileged actions on behalf of users

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Mitigation Strategies

To mitigate this vulnerability, you should update the WWBN AVideo platform to a version that includes the fix, specifically the commit c08694bf6264eb4decceb78c711baee2609b4efd or later.

Since the vulnerability involves unsafe use of eval() in the YPTSocket plugin's WebSocket server, avoid using versions 29.0 and prior.

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Detection Guidance

Detection of this vulnerability involves monitoring WebSocket traffic for suspicious JSON messages containing the fields `msg.autoEvalCodeOnHTML` or `callback` that are relayed without sanitization.

You can inspect WebSocket messages on your network or system by capturing traffic and filtering for these fields to identify potential exploitation attempts.

• Use a network packet capture tool like tcpdump or Wireshark to capture WebSocket traffic on the relevant ports.
• Example tcpdump command to capture WebSocket traffic (assuming default HTTP port 80 or HTTPS port 443):
• tcpdump -i <interface> -A -s 0 'tcp port 80 or tcp port 443' | grep -E 'autoEvalCodeOnHTML|callback'
• Use browser developer tools to monitor WebSocket frames in real time and look for JSON messages containing `msg.autoEvalCodeOnHTML` or suspicious `callback` values.
• On the server, review WebSocket logs or enable verbose logging in the YPTSocket plugin to detect incoming messages with these fields.

Since the vulnerability involves unauthenticated token issuance and message broadcasting, monitoring for unexpected WebSocket connections and broadcast messages from anonymous users can also help detect exploitation.

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