A Cloud Access Security Broker (CASB) is a security policy enforcement point placed between cloud service consumers and cloud service providers to combine and interject enterprise security policies as cloud-based resources are accessed. Implementing a CASB provides several benefits:
* A. Improve firewall rules to avoid access to those platforms: This can help but is not as effective or comprehensive as a CASB.
* B. Implement a cloud-access security broker: A CASB can provide visibility into cloud application usage, enforce data security policies, and protect against data leaks by monitoring and controlling access to cloud services. It also provides advanced features like data encryption, data loss prevention (DLP), and compliance monitoring.
* C. Create SIEM rules to raise alerts for access to those platforms: This helps in monitoring but does not prevent data leaks.
* D. Deploy an internet proxy that filters certain domains: This can block access to specific sites but lacks the granular control and visibility provided by a CASB.
Implementing a CASB is the most comprehensive solution to decrease the risk of data leaks by providing visibility, control, and enforcement of security policies for cloud services.
References:
* CompTIA Security+ Study Guide
* Gartner, "Magic Quadrant for Cloud Access Security Brokers"
* NIST SP 800-144, "Guidelines on Security and Privacy in Public Cloud Computing"