Remediation

From Google Cloud Console

If the TargetSSLProxy or TargetHttpsProxy does not have an SSL policy configured, create a new SSL policy. Otherwise, modify the existing insecure policy.

1. Navigate to the SSL Policies page by visiting: https://console.cloud.google.com/net-security/sslpolicies

2. Click on the name of the insecure policy to go to its SSL policy details page.

3. Click EDIT.

4. Set Minimum TLS version to TLS 1.2.

5. Set Profile to Modern or Restricted.

6. Alternatively, if teh user selects the profile Custom, make sure that the following features are disabled:

        TLS_RSA_WITH_AES_128_GCM_SHA256
        TLS_RSA_WITH_AES_256_GCM_SHA384
        TLS_RSA_WITH_AES_128_CBC_SHA
        TLS_RSA_WITH_AES_256_CBC_SHA
        TLS_RSA_WITH_3DES_EDE_CBC_SHA

From Google Cloud CLI

1. For each insecure SSL policy, update it to use secure cyphers:

        gcloud compute ssl-policies update NAME [--profile COMPATIBLE|MODERN|RESTRICTED|CUSTOM] --min-tls-version 1.2 [--custom-features FEATURES]

2. If the target proxy has a GCP default SSL policy, use the following command corresponding to the proxy type to update it.

        gcloud compute target-ssl-proxies update TARGET_SSL_PROXY_NAME --ssl-policy SSL_POLICY_NAME
        gcloud compute target-https-proxies update TARGET_HTTPS_POLICY_NAME --ssl-policy SSL_POLICY_NAME