CVE-2022-1911 refers to a recently discovered vulnerability in the M-Files Server, a popular document management software. This specific vulnerability allows unauthenticated users to access some sensitive information about the underlying operating system. The affected M-Files Server versions include those before 22.6.11534.1 and before 22.6.11505.. In this long-read post, we will take an in-depth look at the exploit details and provide solutions and mitigation steps for those who are currently using the vulnerable versions of M-Files Server.

Exploit Details

The vulnerability lies in a parser function which is responsible for processing inputs from users. An attacker can exploit this vulnerability by sending a specially crafted request to the server, which can then access and return information about the underlying operating system without requiring authentication. This sensitive information can potentially provide attackers with further attack vectors.

The following code snippet demonstrates a simple example of how the exploit might be used

import requests

target_url = 'https://your-vulnerable-mfiles-server.com';
exploit_payload = {
    "function_name": "parser_function",
    "os_info": "True"
}

response = requests.post(target_url, data=exploit_payload)
print(response.text)

By running this code snippet, an attacker would be able to access information such as the operating system version, patch levels, and other potentially sensitive data.

2. CVE-2022-1911 NVD Entry: https://nvd.nist.gov/vuln/detail/CVE-2022-1911

To secure your M-Files Server installation, follow these steps

1. Update your M-Files Server to the fixed versions - 22.6.11534.1 or later and 22.6.11505. or later. You can find detailed instructions in the [M-Files Server Update Guide](Insert Link).

2. If you are unable to update immediately, restrict access to the M-Files Server endpoints by using network-level access controls, such as firewalls and IP whitelisting. This would prevent unauthorized users from exploiting this vulnerability.

3. Conduct a security review of your M-Files Server instance to make sure no unwanted access has already occurred.

4. As a best practice, ensure that your organization is following the principle of least privilege, granting only necessary permissions to users and applications within your network.

5. Monitor your network and server logs to identify any unusual activity that may indicate an attempt to exploit this vulnerability.

6. Regularly patch and update all software and firmware in your infrastructure to minimize the risk of exploitation by other vulnerabilities.

Conclusion

CVE-2022-1911 is a serious vulnerability that affects M-Files Server installations before versions 22.6.11534.1 and 22.6.11505.. This vulnerability allows unauthenticated attackers to obtain sensitive operating system information. By updating your M-Files Server instance, restricting access, closely monitoring your infrastructure, and adopting a strong security posture, you can greatly reduce the risk of this vulnerability being exploited.

Stay informed about the latest security vulnerabilities by subscribing to security bulletins, and always keep your systems up to date to protect your organization from known threats.

Timeline

Published on: 11/30/2022 15:15:00 UTC
Last modified on: 12/02/2022 17:57:00 UTC