How to Set Up Cloud Access Security Broker (CASB) Features in SASE

Understanding the Role of CASB Within SASE

A cloud access security broker is a security solution that extends policies to SaaS applications, protecting data and monitoring user activity. Typically, CASB functionality is divided into four main categories:

1. Visibility: Monitoring how users interact with SaaS applications across the organization. With CASBs, organizations can view the cloud applications utilized by each user and the data they share with them. This enables IT teams to monitor for suspicious behavior, identify shadow IT (unsanctioned SaaS usage), and log detailed reports on interactions.
2. Data Security: Extends protection as data is shared, used, and stored in the cloud. Typical data security capabilities include enforcing encryption, tokenization, and Cloud Data Loss Prevention (DLP) policies to protect sensitive information.
3. Threat Protection: Tracking cloud usage data to identify potential threats, including malware and compromised accounts. Advanced CASB threat protection includes spotting anomalous behavior and automating incident response for faster remediation.
4. Compliance: Helping organizations both meet and prove regulatory compliance. By enforcing data handling policies and providing detailed reporting, CASBs facilitate a smoother audit process.

CASB configuration in SASE primarily aims to identify and mitigate risks associated with SaaS usage. This includes providing a holistic view of SaaS activity, enabling consistent policy enforcement, and delivering SASE cloud security controls across distributed environments. With effective CASB policy management, only authorized users can access sensitive data in the cloud, and only authorized SaaS applications are in use.

CASB in SASE also delivers a streamlined approach to cloud security. For example, a CASB can automate various protections, including the detection of shadow IT and the application of DLP policies, such as blocking users from uploading sensitive data to unsafe cloud storage. Given the scale and increasing complexity of many organizations’ hybrid or multi-cloud deployments, CASB features also help unify SASE security policies across different providers.

CASB seamlessly operates alongside complementary SASE components, including:

• Zero Trust Network Access (ZTNA): To extend identity-based access rules to SaaS applications.
• Secure Web Gateway (SWG): Filtering web traffic, including traffic between users and SaaS applications, according to consistent security policies.
• Firewall-as-a-Service (FWaaS): Combines CASB application-level protection with FWaaS network-level security.

Together, SASE’s four primary security technologies (CASB, ZTNA, SWG, and FWaaS) deliver a unified approach to securing data, applications, and users across all environments. This bridges the gap between traditional network security and modern cloud usage, providing a security model that aligns with the demands of today’s cloud-first enterprises.

CASB Setup Guide for SASE: Critical Factors to Consider

There are a number of factors to consider when implementing Cloud Access Security Broker (CASB) features in SASE. The CASB setup guide below outlines the most important factors for seamless integration and optimal SASE cloud security.

CASB Deployment Modes

Before setting up CASB features in SASE, it’s important to understand the various deployment modes available. Each mode offers different capabilities and performance to fit the diverse needs of modern organizations. Selecting the right mode, or combination of modes, is key to achieving effective CASB integration and maintaining consistent SASE cloud security.

• API Mode: Connects directly with SaaS apps via APIs, offering deep data visibility and compliance monitoring with minimal user disruption, but lacks real-time threat control.
• Forward Proxy Mode: Inspects traffic inline for instant protection and policy enforcement, though it may add latency.
• Reverse Proxy Mode: Secures sessions for unmanaged devices without agents, but provides less visibility.
• Hybrid Mode: Combines API and proxy approaches to maximize coverage across managed and unmanaged environments, delivering both inline and out-of-band protection.

Map Your Current SaaS Applications and Data Flows

Another critical factor to consider before CASB deployment in SASE is to evaluate your existing cloud environment. Begin by creating a comprehensive inventory of all SaaS applications, both managed and unmanaged, to identify and uncover any instances of shadow IT. Then, map data flows between users and these applications to understand the risks associated with each. Classify each app by:

• Risk level

• Compliance obligations
• Data sensitivity

This process forms the foundation for creating differentiated security policies for high-risk versus sanctioned apps.

A comprehensive assessment of your SaaS applications and data flows enables the identification of potential security vulnerabilities and regulatory requirements, informing future policy creation and enforcement. It also ensures that CASB deployment aligns with business needs.

Integrating CASB with Cloud Infrastructure and Other SASE Components

Connect your CASB with ZTNA, SWG, and FWaaS modules to enable unified inspection and consistent security policy enforcement. Proper integration also aligns CASB with cloud service providers, SaaS applications, and identity systems like Identity Providers (IdPs).

CASB integration can be a lengthy and complex process. To streamline configuration and reduce errors, lean on your CASB or SASE vendor and utilize their automated scripts or APIs. Not only does this reduce the time it takes to configure a new CASB solution, but it also ensures comprehensive coverage across SaaS services.

Integration challenges are one of the most common issues that arise during implementation. CASB best practices during integration include using a phased rollout and starting with non-critical SaaS applications to validate compatibility.

Configuring Robust, Comprehensive Security Policies

With the solution integrated into your IT infrastructure, the next factor is configuring CASB security policies. Proper CASB policy management is critical for protecting sensitive data and ensuring regulatory compliance within a SASE framework. It determines what SaaS applications are available to users and how they can share data with them.

Begin by establishing data classification policies that define sensitive data types and associated protection levels. Align these levels with relevant compliance regulations, such as GDPR, HIPAA, or PCI DSS. Then implement and enforce rules for proper data handling in the cloud. For example:

• Checking for misconfigurations across sanctioned apps
• Preventing uploads of sensitive files to unsanctioned apps
• Blocking unsafe third-party integrations
• Encrypting data at rest and in transit

In addition to these rules, implement automated workflows for threat detection and remediation.

Ongoing CASB Oversight and Optimization

Ongoing monitoring is essential to maintain effective CASB integration within a SASE framework. Utilize analytics to track and analyze user activity, data flows, and security alerts, generating detailed reports that help identify gaps and emerging risks. Adjust your policies continuously based on threat intelligence and evolving regulatory requirements, ensuring your CASB configuration remains aligned with organizational needs.

Common issues to consider when refining CASB security policies include excessive false positives and overly restrictive access policies. You will likely need to fine-tune threat detection systems to find optimal thresholds for achieving a balance between true positives and false positives. Additionally, you need to ensure CASB maximizes security without frustrating users by blocking reasonable access requests. Overly restrictive policies can lead to employees circumventing security controls by using shadow IT, creating significant security issues.