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CASB (Cloud Access Security Broker)

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Overview

A Cloud Access Security Broker (CASB) is a security solution that provides visibility and control over cloud service usage within an organization. It addresses risks associated with shadow IT, data leakage, and compliance in cloud environments by enforcing security policies across cloud applications.

Primary Security Objectives

Mitigate risks from unauthorized cloud application access and data exposure
Enable secure cloud adoption through policy enforcement and compliance monitoring
Focus on protection, detection, response, and governance of cloud usage

Where It Is Used

Cloud security domains including SaaS, PaaS, and IaaS environments
Protection of sensitive data, user access, and cloud-based workflows
Organizations adopting cloud services across industries, especially those with regulatory requirements

How It Works (High Level)

A CASB acts as an intermediary between users and cloud service providers, monitoring and controlling cloud activity based on defined security policies. It aggregates data from cloud services to provide visibility, enforce access controls, detect threats, and ensure compliance with organizational standards.

Key Capabilities

Discovery of cloud applications in use (shadow IT detection)
Data loss prevention (DLP) for cloud-stored information
Access control and identity management integration
Threat protection including anomaly detection and malware prevention
Compliance reporting and policy enforcement across multiple cloud services

Benefits and Limitations

Enhances cloud security posture and regulatory compliance
Improves visibility into cloud usage and data flows
May introduce latency or complexity in cloud access
Effectiveness depends on integration breadth and policy accuracy

Integration and Dependencies

Integrates with identity providers, security information and event management (SIEM) systems, and endpoint security tools
Depends on access to cloud service APIs and user activity data
Requires ongoing policy management and tuning to adapt to evolving cloud environments