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📝 Google HTTPS or SSL Proxy Load Balancer permits SSL policies with weak cipher suites 🟢

  • Contextual name: 📝 HTTPS or SSL Proxy Load Balancer permits SSL policies with weak cipher suites 🟢
  • ID: /ce/ca/google/load-balancing/load-balancer-ssl-policies-cipher-suites
  • Located in: 📁 Google Load Balancing

Flags​

Our Metadata​

  • Policy Type: COMPLIANCE_POLICY
  • Policy Category:
    • SECURITY

Similar Policies​

Description​

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Description​

Secure Sockets Layer (SSL) policies determine what port Transport Layer Security (TLS) features clients are permitted to use when connecting to load balancers. To prevent usage of insecure features, SSL policies should use (a) at least TLS 1.2 with the MODERN profile; or (b) the RESTRICTED profile, because it effectively requires clients to use TLS 1.2 regardless of the chosen minimum TLS version; or (3) a CUSTOM profile that does not support any of the following features:

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

Rationale​

Load balancers are used to efficiently distribute traffic across multiple servers. Both SSL proxy and HTTPS load balancers are external load balancers, meaning they distribute traffic from the Internet to a GCP network. GCP customers can configure load balancer SSL policies with a minimum TLS version (1.0, 1.1, or 1.2) that clients can use to establish a connection, along with a profile (Compatible, Modern, Restricted, or Custom) that specifies permissible cipher suites. To comply with users using outdated protocols, GCP load balancers can be configured to permit insecure cipher suites. In fact, the GCP default SSL policy uses a minimum TLS version of 1.0 and a Compatible profile, which allows the widest range of insecure cipher suites. As a result, it is easy for customers to configure a load balancer without even knowing that they are permitting outdated cipher suites.

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Remediation​

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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]

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policy.yaml​

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Linked Framework Sections​

SectionSub SectionsInternal RulesPoliciesFlags
💼 CIS GCP v3.0.0 → 💼 3.9 Ensure No HTTPS or SSL Proxy Load Balancers Permit SSL Policies With Weak Cipher Suites - Level 1 (Manual)1
💼 Cloudaware Framework → 💼 Data Encryption31