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CVE-2023-37930: Uninitialized Resources and Excessive Iteration Vulnerabilities in Fortinet SSL VPN Webmode

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Overview

This report analyzes the critical vulnerabilities identified as CVE-2023-37930 found in Fortinet’s FortiOS and FortiProxy SSL VPN Webmode. These vulnerabilities can lead to severe consequences, such as system compromise and data leakage, affecting all VPN users who are using the specified version of the software. Given the high-risk factor, this issue requires immediate attention and rectification.

Vulnerability Summary

CVE ID: CVE-2023-37930
Severity: High (7.5 CVSS score)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: System compromise and potential data leakage

Affected Products

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Product | Affected Versions

Fortinet FortiOS SSL VPN webmode | 7.4.0, 7.2.0 through 7.2.5, 7.0.1 through 7.0.11, 6.4.7 through 6.4.14
Fortinet FortiProxy SSL VPN webmode | 7.2.0 through 7.2.6, 7.0.0 through 7.0.12

How the Exploit Works

The vulnerabilities arise from the use of uninitialized resources and excessive iteration, leading to memory corruption. A malicious VPN user can exploit these vulnerabilities by sending specifically crafted requests to the server. The server, after processing these requests, can inadvertently execute code or commands leading to system compromise or data leakage.

Conceptual Example Code

Here’s a conceptual example illustrating how a malicious request might be crafted:

POST /vpn/authentication/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"user": "valid_user",
"password": "valid_password",
"malicious_command": "crafted_command_to_exploit_vulnerability"
}

In the above example, the `”malicious_command”` is the payload that exploits the vulnerabilities. The actual payload would depend on the exact mechanisms of the uninitialized resources and excessive iteration vulnerabilities.

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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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