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.
