CVE-2022-27820: Improper Certificate Validation in OWASP ZAP

Background

OWASP Zed Attack Proxy (ZAP) is an open-source web application security scanner. It is designed to help developers identify vulnerabilities in their web applications and APIs. ZAP is widely used by security professionals and developers to perform security testing and penetration testing. However, the version w2022-03-21 of ZAP is vulnerable to an improper certificate validation issue.

Vulnerability Detail

The vulnerability in ZAP allows an attacker to perform a man-in-the-middle attack by presenting a fake TLS certificate. ZAP does not properly verify the TLS certificate chain of an HTTPS server, which means that it can be tricked into accepting a certificate from an attacker-controlled server. This could lead to sensitive information being intercepted or modified by an attacker. The vulnerability has a CVSS score of 4.0, indicating a moderate severity.

Workaround

As a temporary workaround, you can manually verify the TLS certificate chain of the HTTPS server by using other tools or libraries that provide certificate validation. This will help ensure that the certificate presented by the server is valid and trusted. Here is an example of how to perform certificate validation using the Java programming language and the Apache HttpClient library:

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.ssl.SSLContextBuilder;

import java.io.IOException;
import java.security.KeyManagementException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

public class CertificateValidationExample {

    public static void main(String[] args) throws NoSuchAlgorithmException, KeyStoreException, KeyManagementException, IOException {
        HttpClient httpClient = HttpClients.custom()
                .setSSLSocketFactory(new SSLConnectionSocketFactory(SSLContextBuilder.create()
                        .loadTrustMaterial((chain, authType) -> {
                            // Perform custom certificate validation here
                            return true; // Always trust the certificate
                        })
                        .build(), NoopHostnameVerifier.INSTANCE))
                .build();

        HttpGet request = new HttpGet("https://example.com");
        HttpResponse response = httpClient.execute(request);

        // Process the response
    }
}

Please note that this is just an example and you should customize the certificate validation logic according to your specific requirements.

Conclusion

In conclusion, the version w2022-03-21 of OWASP ZAP is vulnerable to an improper certificate validation issue. This vulnerability allows an attacker to perform a man-in-the-middle attack and intercept or modify sensitive information. To mitigate this vulnerability, it is recommended to update to a patched version of ZAP once it becomes available. In the meantime, you can use the provided workaround or manually verify the TLS certificate chain of the HTTPS server using other tools or libraries.

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