CVE-2024-22262: Spring Framework URL Parsing with Host Validation

Background

The Spring Framework is a popular open-source application framework for Java. It provides comprehensive infrastructure support for developing Java applications. The 'org.springframework:spring-web' package is a module within the Spring Framework that focuses on web-related features and functionality. It includes classes and utilities for handling HTTP requests, responses, and other web-related tasks. This package is widely used in Java web applications to build robust and scalable web services.

However, the 'org.springframework:spring-web' package is vulnerable to a URL parsing issue when using the UriComponentsBuilder class to parse externally provided URLs. If an application performs validation checks on the host of the parsed URL, it may be susceptible to an open redirect attack or a Server-Side Request Forgery (SSRF) attack if the URL is used after passing the validation checks.

Vulnerability Detail

The vulnerability arises due to improper URL parsing and insufficient host validation in the Spring Framework's 'org.springframework:spring-web' package. When an application uses the UriComponentsBuilder class to parse a URL provided externally, such as through a query parameter, and subsequently performs validation checks on the host of the parsed URL, it can be exploited in two ways:

1. Open Redirect Attack: An attacker can manipulate the URL to redirect users to malicious websites, potentially leading to phishing attacks or the disclosure of sensitive information.

2. Server-Side Request Forgery (SSRF) Attack: If the URL passes the validation checks and is used in subsequent operations, an attacker can abuse this to make the application perform unintended requests to internal resources or external systems, potentially leading to data leakage or unauthorized access.

This vulnerability has a CVSSv3 score of 8.1, indicating a high severity level.

Workaround

If upgrading to a fixed version of the 'org.springframework:spring-web' package is not immediately feasible, a temporary workaround can be implemented. The workaround involves manually validating the URL's host using a custom implementation before passing it to UriComponentsBuilder. This ensures that only trusted hosts are accepted and reduces the risk of open redirect and SSRF attacks. Here's an example of a workaround implementation in Java:

import java.net.URI;

public class URLValidator {

    public static boolean isValidURL(String url) {
        try {
            URI uri = new URI(url);
            String host = uri.getHost();
            // Perform custom host validation logic
            // Return true if the host is trusted, false otherwise
        } catch (Exception e) {
            return false;
        }
        return true;
    }

}

Conclusion

The 'org.springframework:spring-web' package in the Spring Framework is vulnerable to a URL parsing issue that can lead to open redirect and SSRF attacks. It is crucial to update the package to the fixed versions mentioned earlier or implement the provided workaround to mitigate the risk. Regularly monitoring for vulnerabilities in your software, such as using Vulert (https://vulert.com), can help ensure the security of your applications. If you need further assistance or have any questions, please contact DevNack.com.

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