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What is a CASB (Cloud Access Security Broker)? Definition from Wallarm

Businesses may utilize Cloud solutions securely while securing mission-critical and sensitive organizational details – thanks to CASBs that can take care of executive protection. A CASB can carefully resolve security loopholes for SaaS, IaaS, and PaaS alike.

This article will discuss everything explicitly about the CASB definition, CASB architecture, and many more. So, let's get started!

What is a CASB (Cloud Access Security Broker)? Definition from Wallarm

Cloud Access Security Broker: All you must know about it

A CASB is a code snippet hosted in the cloud or installed on-site. It acts as a middleman for businesses and the cloud (PaaS) platform they’re using. It not only gives enterprises insight but also has the potential to expand the scope of their CASB security rules beyond their current on-premise network infrastructure to the web and build innovative regulations which are unique to the cloud. 

CASB empowers business ventures through its fine-grained method of data safety and policy deployment, allowing them to use methodical, productivity-improving, and cost-efficient cloud solutions securely. It is very useful considering the fact that most organizations wish to move to the Cloud.

What Makes CASBs Crucial?

To begin with – They act as a security checkpoint for cloud-network operators and cloud-enabled apps. A CASB supervises and administers all data protection rules and procedures, such as confidentiality, alarms, and verification—CASBs increase companies' awareness of who views and uses data throughout terminals.

Through a mix of preventive, surveillance, and mitigation strategies, a CASB safeguards the company. Along with monitoring user behavior, the CASB has other capabilities, such as alerting managers to potentially dangerous conduct, preventing the deployment of spyware or other risks, and identifying possible regulatory issues. 

The company's firewall or proxy records may also be examined by the CASB in order to gain a deeper understanding of cloud apps and spot unusual activity.

Given the increasing use of cloud-based solutions and the growing prevalence of bring-your-own-device rules, a CASB approach is very beneficial. When these two phenomena are combined, the data ecosystem has grown significantly, making it more challenging for the IT department to monitor network usage and guarantee the company’s data safety.

Considering CASBs have access to private gadgets, it's critical that the system adheres to current privacy laws and only looks at company data.

Cloud Access Security Broker

Four pillars of CASB

4 core components are considered while building a CASB solution:

  • Conformity

For cloud-based computing services to function at an administrative level, an excessive number of regulatory requirements must be satisfied. This is especially true for the government sector, as well as for the financial and healthcare sectors. 

Taking the help of CASB, you may create stringent data protection guidelines by determining the most significant issues in your industry in order to achieve and maintain conformity throughout your whole company.

Companies now have a heightened need to understand what's occurring in their online settings due to remote work and BYOD. There are many uncontrolled devices, and you need to have adequate insight into your installations to avoid ending yourself granting unauthorized entry. 

A CASB finds out which cloud-based apps your company uses, generates facts on cloud spending, and executes risk analyses to assist you in deciding whether to prohibit an application.

  • Protection from threats

IT's current environment is rife with cloud vulnerabilities and ransomware, and private cloud resources are sometimes the most exposed. Your cloud security controls are boosted by the strength of behavioral analysis and risk information provided by a CASB. 

With the help of these sophisticated capabilities, you can strengthen your company's entire cloud security infrastructure, swiftly recognize and address unusual activity, and secure your cloud apps and communications.

  • Data Protection

The amount of data in the world increases in size every two years. Because of the continuous data growth, malicious hackers are now more cunning than ever. You can identify and stop possible data dangers by integrating a CASB with cloud DLP. 

Additionally, you have insight into critical information moving across clouds or to or from them, providing you with the most incredible shot to spot events, implement the necessary policies, and, most importantly, safeguard data.

How does a CASB work?

In order to satisfy business security goals, a CASB's main role is to give control and transparency over data and mitigate risks. This is accomplished in three steps:


Auto-discovery is used by the CASB solution to generate a list of all third-cloud solutions and the users who are utilizing them.


After the complete scope of cloud infrastructure has been exposed, the CASB assesses the overall risk related to each by identifying the application, the type of data it contains, and how it is being distributed.


After figuring out the potential risk of each program, the CASB may use this knowledge to establish guidelines for the company's data and access privileges that will fulfill its security goals. The CASB can also utilize this information to take automated action whenever a breach happens.

In addition, CASBs provide additional CASB cloud security layers by preventing malware and encrypting data.

Cloud Access Security Broker architecture
Cloud Access Security Broker architecture


The fundamental components of cloud workload prevention technologies and cloud security posture management (CSPM) are frequently contrasted. The CI/CD pipeline connections and safety cloud APIs are the main areas of concentration for CSPM. 

Another crucial function of CWPP is real-time threat monitoring and cloud vessel encryption. However, while in use, CSPM and CWPP are both crafted to secure private data kept on the internet.

A CASB aims to increase terminal transparency, including who is viewing content and how it is being used, while CSPM and CWPP strive to safeguard the organizational data.

The trinity for data accessibility and security to the cloud includes CASB, CSPM, and CWPP. To strengthen their cloud firewalls, business organizations should use all three security measures.

Benefits of CASBs 

  • Administrate Privileged Accounts

Your company may properly handle and organize its cloud activities with the aid of the right CASB technology. Prioritizing and managing authentication systems and implementing numerous variations and combinations of limitations and privileges are used to access and handle data in the most straightforward manner possible.

The admin often has greater authority and responsibilities. As a result, if a company detects a danger inside the admin areas, it will be considered a significant risk since it might result in more damage than a customer at the bottom of the hierarchy.

  • Invisible IT Solutions

Understanding what is unknown! A CASB technology offers insight into Shadow IT processes, assisting in identifying unsafe cloud apps, preventing harmful applications, and identifying individuals who are most at stake. 

One must be cautious while selecting cloud apps (authorized apps) and develop adherence policies and guidelines in accordance with the process to meet the statutes and guidelines like HIPAA. It will provide safety and compliance for any data present in your cloud. 

Digital solutions deemed hazardous by businesses might be labeled as "unauthorized" and have access to them prohibited.

  • Reduced Operating Costs

Contractual advantages may also be gained by consolidating a single service in the shape of website permissions or a reduced cost per account, which can only be attained with the IT bureau's purchasing power. 

Further administration can be introduced to streamline installation and provide management which will work under the supervision of the IT department. The use of just-in-time provisioning can facilitate speedier staff startup. The supplemental management features reduce application abuse that might put the company in danger while also assisting in controlling subscriber numbers.

The main functions of CASB

  1. Data Governance

CASBs are renowned for their effectiveness in figuring out shadow IT practices and use their knowledge to ensure added organizational security. With their help, it’s easy to gain complete visibility and oversight over your company's use of the cloud. With CASBs, you may utilize the identity, resource, action, program, and information for controlling the access/information instead of using a blanket approach and barring all activities.

Furthermore, you may set policies depending on the kind of service or menaces and select from a range of compliance options, including block, alarm, skip, encode, isolate, and coach. Lastly, you may utilize these situations to inform your IT staff of any violations of internal reporting policies.

  1. Secure Data

Using encryption, text categorization, or other methods, a CASB attempts to secure and prohibit data breaches, damage, or leaks throughout all cloud apps and platforms. When data is being used, moved, or stored from any cloud service or software to any terminal, data loss prevention (DLP) tools and procedures are established. 

Additionally, they constantly check for rules that have been broken in the cloud regulatory environment. A company will include CASB in its overall security infrastructure and policy.

  1. Protect Against Threats

Safeguard yourself against cloud-based risks like ransomware and spyware. You should start with a complete view of all web services, including those connected through SSL encryption. Utilize vulnerability intelligence sources like which of your individuals' identities have been hacked and abnormality monitoring. 

Add machine learning to recognize ransomware and dynamic and static anti-malware detection methods after that. Finally, you need to utilize out-of-the-box connectors and processes to equip most of your system reliability with your results. Attacks will constantly be evolving; thus, your CASB vendor needs to do the same.

Why do businesses need CASB?

Enterprises are now in charge of enforcing ever-more complicated security protocols between consumers and cloud-based apps. Conventional binary protection mechanisms no longer work for a cloud-based organization juggling numerous places and devices since they block or permit access. 

A business may implement security policies with flexibility and adaptability by using a CASB, which offers solutions specific to the needs of the modern workforce while harmonizing data protection with access protection.

How to choose a CASB?

  1. Identification of app security 

Often, businesses would be shocked to learn how many apps their whole network employs. Programs may be quite helpful, but it's crucial to understand which ones are currently gaining access to business info. A CASB solution must allow the user to disengage from unsafe or unsuitable applications and give identification and monitoring of linked third-party applications.

  1. Control over data security

Monitoring is the initial step in assisting with data security. Businesses should limit access to locations where the material is not important to an individual's job activities. Once intruders are on the system, they will seek to travel horizontally to access encrypted information. However, the leading considerations while choosing a CASB are the following:

  • Visibility 
  • Protection from malicious attacks
  • Control of data safety
  • Explore, classify, and disable perilous applications in app security

How do I deploy a CASB?

A key selling feature of cloud-based security brokerage technology is its convenience. One significant advantage of CASB is its simplicity of installation, in addition to its simplicity of usage. However, there are a few considerations to consider:

  • Deployment’s Path: A CASB can be set up on-site or in the cloud. Nowadays, the SaaS variant is commonly used, and therefore, most CASB implementations are SaaS-oriented.
  • Reverse Proxy: It makes a perfect aid for gadgets often not covered by information security.
  • API Control: Its benefits include faster installation, thorough coverage, and quick insight into your Cloud security posture to help you mitigate risks related to your IT infrastructure.
  • Forward Proxy: It works great when used together with cybersecurity solutions or VPN clients.
  • Release Model: Consideration should be given to the API Controls and Reverse/Forward Proxy configurations when it comes to your CASB deployment models.

In order to apply integrated constraints on a real-time basis and adhere to data eligibility rules, the most often used solution is proxy.

The Final Word

CASB is a critical aid for ensuring cybersecurity in the corporate realm today. Companies must take into account the CASB products, as they offer a broad spectrum of solutions for various architecture. They are really helpful in controlling access-related situations for the Cloud scenario as a whole. A multi-mode CASB's versatility means enterprises can scale efficiently in the future.


How do I choose the right CASB for my organization?
What types of threats can a CASB protect against?
What are the benefits of using a CASB?
How does a CASB work?
What is a CASB?


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February 26, 2024
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