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CVE-2024-56523: Bypassing firewall filters in Radware Cloud WAF

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Overview

In this blog post, we will be discussing a high-severity vulnerability identified as CVE-2024-56523. This vulnerability affects the Radware Cloud Web Application Firewall (WAF) and can enable remote attackers to bypass firewall filters. The flaw lies in the handling of HTTP GET requests that include random data within the request body. This exploit is particularly dangerous because of its potential to compromise systems and leak data, hence the importance of understanding it better and implementing the appropriate mitigation measures.

Vulnerability Summary

CVE ID: CVE-2024-56523
Severity: Critical (CVSS 9.1)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage

Affected Products

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Product | Affected Versions

Radware Cloud WAF | Versions before 2025-05-07

How the Exploit Works

The vulnerability lies in the handling of HTTP GET requests by the Radware Cloud WAF. When an HTTP GET request is made with random data included in the request body, the WAF fails to filter this request correctly, thus allowing it to pass through. This faulty handling can be exploited by remote attackers to bypass firewall filters, potentially leading to system compromise and data leakage.

Conceptual Example Code

While the exact exploit code is specific to the attacker’s intent and context, a conceptual example that might trigger the vulnerability could look like this:

GET /resource HTTP/1.1
Host: vulnerable.example.com
Content-Type: application/json
{ "random_data": "..." }

In this example, the “random_data” in the request body is the unexpected input that triggers the vulnerability in the firewall’s filtering mechanism. Note that this is a conceptual example, and the actual exploit could take different forms depending on the specific conditions and the attacker’s objectives.

Recommendation

Users of the Radware Cloud WAF should apply the vendor patch as soon as possible. In cases where immediate patching is not possible, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation. However, these measures can only limit the exploit’s impact and do not fully resolve the vulnerability. Therefore, applying the vendor patch remains the most effective method of mitigation for CVE-2024-56523.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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