January 19, 2025

Cloud Security

With the rise in security incidents involving data breaches and unauthorized access, cloud security has become indispensable for any company relying on cloud-hosted enterprise applications. However, with time, the landscape of cloud software deployment has undergone massive shifts due to the requirements around managing scale, geographical spread, and faster release cycles. These shifts have resulted in radical changes in cloud architectures, such as the evolution from static server deployment to dynamic and ephemeral deployment units.  Such changes render the traditional approaches to cloud security utterly ineffective and demand a complete rethink from the ground up.

Table of Contents
1
What is Cloud Security?
Latest Cloud Security Use Cases
2
Next-Gen Container Security: Why Cloud Context Matters
3
A Quick Explanation of Multi-Factor Authentication (MFA)
4
Blocking Malicious Typosquatting Attacks on Open Source Packages
5
The Three Fronts of Cloud Security Architecture
The External Front: External threats and attacks from outside the organization
Adjacent Front: Adjacent threats from supply chain
The Internal Front: Internal threats from within the organization
6
Cloud Security Concepts and Methodologies
Security Posture Management
Zero Trust Security Model
Security Collaboration Tools
7
Tackling the Three Fronts of Cloud Security 
The External Security Front
The Adjacent Security Front
The Internal Security Front
8
Strategic Cloud Security Initiatives

What is Cloud Security?

The cloud security domain covers the practices, concepts, and methodologies for protecting cloud hosted infrastructure and applications from threats, such as malicious attacks or unwarranted user access. Cloud security has considerable overlap with IT security and cybersecurity. IT security forms the baseline security mechanism for providing an outer security perimeter to the cloud resources such as compute, storage, and networking functions that enable application hosting. Cybersecurity provides guardrails to safeguard user-dependent attack surfaces, such as email and messages, through which the identities of privileged users accessing cloud resources can be compromised.

Latest Cloud Security Use Cases

Next-Gen Container Security: Why Cloud Context Matters

A Quick Explanation of Multi-Factor Authentication (MFA)

Blocking Malicious Typosquatting Attacks on Open Source Packages

Load More

Together, all these three domains must work in a coordinated way to tackle multiple fronts of cyber-warfare and effectively thwart malicious actors and fraudsters from exploiting any system and data hosted on a cloud. At the same time, it is vital to have complete visibility of the cloud applications and infrastructure to mitigate impending attacks.

The Three Fronts of Cloud Security Architecture

From the cloud security standpoint, the key stakeholders in an organization are continuously fighting a three-front battle.

Cloud Security - Combined Attack Surfaces

Cloud Security - Combined Fronts

The External Front: External threats and attacks from outside the organization

The external front deals with the outsider attacks on cloud infrastructure. DDoS is the most common attack, ready to unleash torrents of malicious traffic that can instantly drown cloud computing systems such as compute instances, cloud storage, and databases. Such threats constantly evolve, always probing from outside for vulnerabilities to exploit and hamper business operations. Apart from that, brute force attacks on passwords and identity secrets form the most common modus operandi for attackers.  Some of these attacks are launched through malware and phishing ploys, which come under the ambit of cybersecurity. Still, the motivation is to gain unauthorized access to cloud resources from outside.

Adjacent Front: Adjacent threats from supply chain

The adjacent front guards the lateral attack surfaces to cloud security from vulnerabilities originating from vendors, partners, and third-party software or service providers that an organization relies on to deploy its cloud infrastructure. Adjacent threats are also commonly known as supply chain threats. Hackers exploit them, slipping through the defenses unnoticed like thieves entering a building through a neglected broken back door. Malicious code can be injected through this mechanism to perpetrate application attacks, spreading like a virus to infect cloud computing environments with unknown zero day vulnerabilities.

The Internal Front: Internal threats from within the organization

This front tackles the insider threats to cloud security that stem from individuals within the organization, such as rogue employees, careless vendors, or disgruntled contractors. These insiders can easily bypass security measures and steal sensitive data. Being inside the organization also makes it easier for them to plant malicious code or disrupt operations, leading to significant security risks. The internal front also has to monitor access misconfigurations and security policy lapses due to human error, which might have been done unintentionally but can cause blind spots to open up.

Cloud Security Concepts and Methodologies

Given the challenges in managing the three fronts, it is essential to adopt systemic approaches to develop scalable strategies and processes for cloud infrastructure security. To better understand these approaches, drawing parallels with the security methodologies adopted in the brick-and-mortar world is always beneficial. 

Traditionally, cloud security architecture has modeled the principles of IT security. IT security, in turn, is influenced by physical security practices that follow a methodology around layered security perimeter design. The early cloud security strategies mirror the same methods employed in physical security to protect valuable cloud assets.

For example, a high-security building has multiple layers of defense, such as fences, gates, patrolling guards, CCTV cameras, and alarms. Initially, IT and cloud security adopted a similar methodology for physical networks, with digital defenses like firewalls, antivirus, access control, and monitoring systems. This layered design aims to create multiple barriers to potential threats, ensuring that even if one layer is breached, the subsequent layers can mitigate the risk, thereby progressively reducing the overall probability of attack.

Such a layered design is suitable for a static cloud deployment architecture. However, it becomes inefficient as cloud environments adopt a cloud-native deployment approach. That’s because the layers encompass a fixed network perimeter, which becomes fuzzy with rapid and dynamic resource provisioning and scaling in cloud-native deployment.

Additionally, with the distributed cloud infrastructure employing serverless and microservices architectures across cloud vendors and geographies, maintaining comprehensive visibility and monitoring across all security layers encapsulated within a fixed perimeter definition becomes challenging. Finally, the layered security design is not capable of handling adjacent threats. It was never designed to block the loopholes caused by software and IT supply chain vulnerabilities.

The layered security design is still relevant as an outermost shield for cloud network security. However, considering its limitations, cloud security requires a multi-pronged approach combining a few other concepts.

Security Posture Management

Security posture refers to the overall security status score of an organization’s cloud infrastructure, which includes hardware, networks, and other ancillary systems. It takes a breadth-first approach instead of the traditional layered approach based on depth. 

The best way to envisage security posture is to think of a segment of the cloud deployment and apply comprehensive security management checks, including policies, procedures, and controls, to determine the readiness and ability to detect, prevent, and respond to security threats. This approach can be applied broadly to the entire organization or through logical grouping, which divides the cloud infrastructure into smaller, isolated units.

For example, logical grouping of cloud infrastructure can be done at a broader level to segregate multicloud environments across public cloud and on-premises infrastructure. Similarly, a more granular logical arrangement is achieved based on the cloud workload of individual applications. These units can also be logically regrouped through security automation based on the dynamics of the cloud deployment, allowing better adaptability to new threats in a changing cloud environment.

Thus, security posturing offers a holistic score of the security parameters through continuous assessment, regular monitoring, and checks for consistent policies and compliance. It helps visualize the entire cloud infrastructure partitioned by zones that reflect the security posture score of each unit. Compared to the perimeter-based layering approach, the security posture scoring approach prevents a lack of visibility in security controls. It is more scalable and manageable for large, distributed, constantly evolving cloud infrastructure.

Zero Trust Security Model

The Zero Trust Security Model represents a modern approach to cloud network security. This model assumes that no entity (user, application, or service) is inherently trusted by default, even inside the corporate network. It focuses on strict identity verification and continuous authentication, applying security policies based on user and device identities rather than perimeter-based controls.

The zero trust model is implemented through measures such as micro-segmentation, continuous monitoring, and contextual access control. Micro-segmentation divides the cloud infrastructure into smaller segments and independently applies security controls to each segment, limiting attackers' lateral movement. Continuous monitoring of user activities and system behavior detects anomalies and potential threats. Additionally, contextual access control relies on parameters beyond the standard authentication and authorization procedures to enhance access checks based on additional factors such as user behavior, time, and access location.

Security Collaboration Tools

Cloud security relies on a mutual responsibility model involving collaboration across multiple stakeholders within and outside the organization. This collaboration is vital for modern cloud deployments to ensure a comprehensive, coordinated defense against threats. It involves the application development teams, DevOps, IT, and security teams. This collaboration also extends to external stakeholders, like cloud platform vendors (for example, AWS or Google Cloud). These external cloud providers also provide services such as threat intelligence feeds and vulnerability databases to aid security investigations and vulnerability remediation measures. 

But beyond stakeholder interactions, security collaboration is facilitated through a set of platforms and tools. These are commonly referred to as Security Information and Event Management (SIEM) systems. These systems aggregate logs and security data from various sources across the cloud environment, providing a unified view of security events. Further, the SIEM is also responsible for managing the incident response workflow, ensuring that security incidents are managed collaboratively and efficiently. SIEM platforms also integrate threat intelligence feeds, enabling teams to stay informed about the latest threats and vulnerabilities and apply this knowledge to build adversarial tactics and techniques to mitigate the risks based on real-world observations.

Additionally, a few other cloud security solutions like SOAR, TIP, and XDR integrate with SIEM to build a unified platform that fosters collaborative security management across all fronts.

Tackling the Three Fronts of Cloud Security 

Let's delve into the security aspects of the external, internal, and adjacent fronts. Each front has its own significance and requires specific tools and platforms to handle specific risks.

The External Security Front

This front manages external threats outside the organization's network, including cyber-attacks such as DDoS, phishing campaigns, malware, and ransomware. These threats aim to exploit vulnerabilities in the cloud environment’s external attack surfaces to gain unauthorized access, disrupt services, or steal sensitive data.

Cloud Security - External Front

Cloud Security - External Front

The external front is manned by traditional perimeter security layers such as firewalls, intrusion detection systems, and spam filters. However, as explained earlier, perimeter security layering is insufficient to tackle more significant threats like DDoS attacks. DDoS protection is implemented through another layer that performs minute analysis of the incoming traffic to enforce dynamic traffic filtering strategies. These strategies range from rate limiting and traffic scrubbing to more advanced network traffic analytics.

Beyond these measures, the external front is also responsible for gathering intelligence about impending threats and attacks from outside. This approach is similar to intelligence gathering in the conventional security apparatus to safeguard national security, prevent crimes, and maintain public safety. The same principles have been adapted to the cyber realm. In the case of cloud security, these principles are applied for monitoring and analyzing intelligence inputs to detect and mitigate threats to networks, systems, and information. The critical aspects of this approach include:

  1. 1
    Cyber Threat Intelligence (CTI): This involves collecting and analyzing data on cyber threats, such as malware, phishing, and hacking tactics, techniques, and procedures (TTPs).
  2. 2
    Network Traffic Analysis: This involves monitoring network traffic to detect unusual patterns indicating an evolving threat landscape.
  3. 3
    Dark Web Monitoring: This involves gathering intelligence from hidden parts of the Internet where cybercriminals operate, such as forums, marketplaces, and encrypted communication channels.

The external security front continually grapples with real-time threats and the uncertainty surrounding the origin and impact of attacks. Unlike the other fronts, this problem is unique since bad actors operating outside the boundaries of an organization’s cloud infrastructure are difficult to trace at the onset. Therefore, this front heavily relies on security collaboration tools and techniques discussed earlier to deal with impending threats.

The Adjacent Security Front

This front manages cloud security vulnerabilities that seep into the organization’s cloud infrastructure through the hardware or software supply chain. A supply chain attack plants a vulnerability into an otherwise secure cloud infrastructure, which can later be exploited through a disguised entry to unleash chaos through various means, such as siphoning confidential information, altering data, or sabotaging business continuity.

Cloud Security - Adjacent Front

Cloud Security - Adjacent Front

The first line of defense against such attacks is a closely guarded process and secure access for installing and provisioning software and hardware. This starts with a strong DevSecOps practice, which enforces a shared security responsibility model for software delivery and deployment via a few processes, such as:

  1. 1
    Static Application Security Testing (SAST) to analyze source code or compiled versions of code to identify security vulnerabilities early in the development process.
  2. 2
    Dynamic Application Security Testing (DAST) to perform penetration tests on running applications to identify security vulnerabilities by simulating attacks from the outside.
  3. 3
    Software Composition Analysis (SCA) to analyze and manage the security and licensing associated with open-source and third-party components used in cloud workloads.

These processes must be applied to software supplied by every vendor to build an application-specific security posture score before the software is approved for use within the organization’s cloud infrastructure. These are further augmented with guardrails associated with the installation and commissioning of software, OS, and hardware devices through:

  1. 1
    Application protection platforms, such as Cloud Workload Protection Platform (CWPP) and Cloud Native Application Protection Platform (CNAPP) to provide a secure cloud environment for sensitive workloads built atop virtual machines, containers, and serverless functions.
  2. 2
    Cloud Security Posture Management (CSPM) to help organizations manage and improve their cloud security posture by identifying and remediating misconfigurations and compliance issues.
  3. 3
    Cloud hardening for securing cloud environments to protect them from vulnerabilities, attacks, and unauthorized access.

Despite all these measures, security issues do crop up within the cloud infrastructure due to complexities in multicloud environments and non-standard operational challenges arising from cloud migration or during zero-day vulnerabilities. To contain such situations, adequate measures must be implemented through various types of cloud security monitoring and observability mechanisms, such as:

  1. 1
    Anomaly detection via EDR or XDR systems to detect exceptions that might indicate malicious activity, such as user and entity behavior that deviates from normal behavior.
  2. 2
    Network Detection and Response (NDR) for detecting and responding to suspicious activities and threats within the network.
  3. 3
    Comprehensive security observability via collection and analysis of telemetry data from various parts of the cloud environment, including logs from OS, audit trails, IAM, and authorization systems to enable centralized visibility for threats and indicators of compromise within the cloud environment.

The remediation for threats and attacks arising from adjacent security risks is also looped into security collaboration solutions such as SIEM, SOAR, and TIP platforms to help orchestrate quick investigation and incident resolution across a complex hybrid cloud environment.

The Internal Security Front

The internal security front is the key to maintaining the overall sanctity of the organization's cloud infrastructure security and IT resources. At its core lies the Identity and Access Management (IAM) system, which governs all the configurations related to permissions management.

Cloud Security - Internal Front

Cloud Security - Internal Front

The IAM is further strengthened by additional security measures such as:

  1. 1
    Conditional access policies to dynamically configure additional vectors to authenticate or authorize the users.
  2. 2
    Multi-factor Authentication (MFA) to add an extra layer of security during identity verification and authorization for access to resources.
  3. 3
    Identity Threat Detection and Response (ITDR) mechanism to analyze identity related threats and mitigate potential breaches and malicious activities linked to compromised identities.
  4. 4
    An overarching Cloud Infrastructure Entitlement Management (CIEM) layer to plug identity and access specific security gaps and ensure that all identities and their entitlements are within the acceptable limits of least privileges access policies and aligned with the organizational hierarchy.

The XDR and EDR mechanisms for monitoring anomalous activities in user devices also play an essential role on this front. This is a common requirement for adjacent and internal fronts since a breach in the former usually shifts the security risks to the latter.

Strategic Cloud Security Initiatives

Apart from specific cloud security principles addressing each security front, a few strategic initiatives that span the entire cloud deployment are also needed to mitigate cloud security risks.

  1. 1
    Multi-layered posture management: Multi-layered posture management combines Cloud Security Posture Management (CSPM), Application Security Posture Management ( ASPM), and Data Security Posture Management ( DSPM) to build a strong security posture. It offers a bird' s-eye view, like a single window that zooms in and out of the cloud infrastructure to provide a unified view of the overall security posture.
  2. 2
    Cloud HSM: Cloud-based hardware security module holds the master key and acts as a host for secure storage and retrieval of encryption keys. It also performs cryptographic operations for encrypting and decrypting data and creating digital signatures and certificates in a secure and tamper-proof environment.
  3. 3
    SASE: Secured Access Service Edge combines the concepts of Software Defined Networking (SDN) and Cloud Access Security Broker (CASB) to enable broader cloud and network security needs for large enterprises that require fine-grained security controls for remote and hybrid users. SASE enables enterprises to apply secure access regardless of where applications, devices, users, and workloads are located, which is vital to remote-based workforces.
  4. 4
    Cloud Security Alliance: CSA is an authority in cloud security and one of the leading organizations dedicated to defining and raising awareness of this subject. CSA offers advisory research, memberships, cloud security certifications, and training programs to assist organizations in adopting best practices for securing their cloud computing environments.
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