IP Restriction Bypass in Simple PHP Router

Executive Summary

This vulnerability is an IP restriction bypass in the simple-php-router library through version 5.4.1.7. The IpRestrictAccess middleware fails to properly validate client IP addresses, allowing attackers to bypass IP whitelists and blacklists by spoofing HTTP headers like X-Forwarded-For, CF-Connecting-IP, or Client-IP.

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Detection Guidance

To detect this vulnerability, inspect HTTP request headers for spoofed X-Forwarded-For, CF-Connecting-IP, or Client-IP headers. Check if your application logs or network traffic shows unexpected IP addresses in these headers. Use tools like tcpdump or Wireshark to capture and analyze HTTP traffic for header manipulation attempts.

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Impact Analysis

Attackers could exploit this to gain unauthorized access to IP-restricted routes, potentially accessing sensitive data or administrative functions. This could lead to data breaches, unauthorized system access, or bypassing security controls that rely on IP restrictions.

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Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR's data protection requirements or HIPAA's access controls. Organizations using this library may fail compliance audits if IP-based restrictions are part of their security controls.

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Mitigation Strategies

Update simple-php-router to version 5.4.1.8 or later to patch the IP restriction bypass vulnerability in the IpRestrictAccess middleware.

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