Impact Analysis

This vulnerability can impact you by allowing attackers to spoof their IP address, which can lead to several security issues.

• Bypassing IP-based access controls, allowing unauthorized access to restricted resources.
• Evading IP-based rate limiting, potentially enabling denial-of-service attacks or abuse of resources.
• Circumventing audit logging by hiding the true origin of requests, complicating incident response and forensic analysis.
• Potential privilege escalation if the system trusts certain IP addresses (e.g., localhost) for elevated permissions.

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Executive Summary

[{'type': 'paragraph', 'content': "CVE-2026-33690 is an IP address spoofing vulnerability in the WWBN AVideo platform (versions up to 26.0). The vulnerability exists because the function getRealIpAddr() trusts user-controlled HTTP headers such as 'HTTP_X_REAL_IP', 'HTTP_CLIENT_IP', and 'HTTP_X_FORWARDED_FOR' to determine the client's IP address."}, {'type': 'paragraph', 'content': 'An attacker can send forged headers with fake IP addresses, causing the system to believe the request originates from a different IP. This allows the attacker to bypass IP-based access controls, rate limiting, and audit logging.'}, {'type': 'paragraph', 'content': "For example, an attacker can send a request with a header like 'X-Client-IP: 127.0.0.1' to make the server think the request is coming from localhost, potentially escalating privileges if certain IPs are trusted."}] [1]

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': "This vulnerability can be detected by checking if the server is accepting and trusting user-controlled HTTP headers such as 'X-Client-IP', 'X-Real-IP', 'X-Forwarded-For', or 'Client-IP' to determine the client's IP address."}, {'type': 'paragraph', 'content': 'A practical way to test this is to send HTTP requests with forged headers and observe if the server logs or access controls reflect the spoofed IP address.'}, {'type': 'paragraph', 'content': 'For example, you can use the following curl command to send a request with a spoofed IP header:'}, {'type': 'list_item', 'content': 'curl -H "X-Client-IP: 127.0.0.1" https://target.com/any_endpoint.php'}, {'type': 'paragraph', 'content': 'If the server treats this request as coming from 127.0.0.1 (localhost) in logs or access control decisions, it indicates the vulnerability is present.'}] [1]

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Mitigation Strategies

[{'type': 'paragraph', 'content': 'Immediate mitigation involves not trusting user-controlled HTTP headers for IP address determination.'}, {'type': 'paragraph', 'content': 'Specifically, you should:'}, {'type': 'list_item', 'content': "Avoid using headers like 'X-Client-IP', 'X-Real-IP', 'X-Forwarded-For', or 'Client-IP' directly to determine client IPs without validation."}, {'type': 'list_item', 'content': "Implement strict validation of IP addresses using reliable methods such as PHP's filter_var() with FILTER_VALIDATE_IP and checks to exclude private or loopback IP ranges."}, {'type': 'list_item', 'content': 'Apply the patch from commit 1a1df6a9377e5cc67d1d0ac8ef571f7abbffbc6c which refactors IP retrieval functions to improve security and prevent spoofing.'}, {'type': 'paragraph', 'content': 'Until the patch is applied, consider restricting access controls and audit logging to rely on the REMOTE_ADDR server variable only, and be cautious about trusting forwarded headers.'}] [2]

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