Challenges and solutions for securing cloud environments

The increasing transfer of data and applications to the cloud is creating new security challenges. Organizations need to ensure that their cloud environments are best protected against attacks. When using cloud environments, the scope of security extends far beyond the traditional on-premise network, as users can use the services or resources wherever they have access to the Internet. As a result, organizations are no longer able to protect their services and resources using traditional methods such as firewalls.

Perimeter in the cloud and the primary security perimeter

In a traditional on-premises IT infrastructure, physical firewalls and network segments form the primary security boundaries as the front line of defense, shielding the internal network from the external, public network. This concept, called “perimeter”, can only be applied to a limited extent in the cloud world. The primary security boundary of modern cloud environments defines the transition between trusted internal resources and external, potentially insecure networks. In the cloud, the boundaries between internal and external networks are blurred. Because data and applications are spread across different geographic locations and infrastructures, there is no longer a single, clear area of demarcation. The focus shifts with regard to the primary safety boundary. This boundary is dynamic, defined by identity and access management, and secured by data and transport encryption and continuous monitoring. It is designed to protect critical resources, regardless of where they are physically located. The primary security boundary thus shifts to the cloud environment itself, the perimeter extends across the entire cloud environment. Therefore, security must be built in multiple layers – from infrastructure to platform and application level to identity and access control.

This protection mechanism is therefore based on virtual perimeter concepts in the cloud. For example, a perimeter encloses logically grouped resources – such as storage services, databases or computing instances – and regulates the flow of data between them. The different levels to be secured also bring with them a large number of possible weak points and sources of error.

Common vulnerabilities in cloud environments

The most common vulnerabilities and sources of error in cloud environments and their specific manifestations are as follows:

Misconfiguration

Improper settings – such as publicly accessible data storage or excessive network sharing – are one of the biggest threats. A single misconfigured service can compromise the entire environment.

Weak identity and access management (IAM)

Overprivileged accounts, missing or non-comprehensive multi-factor authentication (MFA) and weak passwords as well as outdated access rights make it easier for attackers to access cloud environments and move there laterally. With hybrid architectures, both worlds (cloud and on-premises) are quickly completely compromised.

Insecure APIs

Cloud APIs that communicate unencrypted or do not implement rate limits, for example, are often misused for denial-of-service (DoS) attacks or in data leaks.
Incorrectly implemented authentication processes can be misused for the extraction or manipulation of data. 

Outdated software and inadequate patch management

An often underestimated risk in cloud environments is unpatched systems with known security vulnerabilities. Even in cloud environments, systems are operated with the usual operating systems and software packages. Therefore, accurate update and patch management is essential here as well.

Monitoring and incident response

Missing or inadequate monitoring makes it easier for attackers to exploit vulnerabilities and then spread within the cloud environment. This is often due to a lack of resources for monitoring and evaluating logs. To make matters worse, there are often no proven concepts or instructions for action that ensure the continued operation of the company in the event of security incidents.   The vulnerabilities in cloud environments are not only numerous, they are also not easy to secure.

Challenges of securing cloud environments

The biggest challenges in securing cloud environments lie in the dynamic nature and distributed architecture of the cloud. In addition, there is often a lack of specific knowledge, and not infrequently also the necessary staffing levels.

The following aspects should be mentioned primarily:

Infrastructure Complexity

• Cloud environments are often complex and change quickly, making it difficult to monitor and control.
• Old test instances or resources orphaned due to unclear responsibilities offer an attack potential that should not be underestimated.
• Defining logical perimeters in multi-cloud scenarios requires in-depth know-how.
• Flawed rules – such as inconsistent IP filters between different cloud services – weaken the primary security boundary.

Shared responsibility

The shared responsibility model between cloud providers and users often leads to unclarity in responsibilities – especially on security-related topics – and thus very often to security gaps when users neglect to secure provider-managed layers.

Identity and access management

Managing user permissions and access controls within a cloud environment, and especially across different cloud services, is a major challenge. Clear responsibilities are essential here.

Dynamic scaling

• Cloud resources often scale automatically, making manual security audits impractical.
• Tools such as Infrastructure-as-Code (IaC) must therefore be included in audits to prevent configuration drift, i.e. deviations from the safe ground state.

How penetration testing improves the security of cloud environments

Penetration testing and security audits have established themselves as key tools to identify and remediate vulnerabilities in these environments. Through the targeted simulation of attack scenarios and the systematic review of configurations, critical gaps such as insecure access rights, incorrect perimeter definitions or unprotected interfaces can be uncovered. Ideally, the testers analyze not only the technical conditions, but also processes and the authorization management of the users.

In this way, gaps in the configuration, missing security settings or vulnerabilities in authentication can be identified.

Adherence to basic security standards and guidelines as well as the implementation of best practice measures are other aspects to be examined. Security audits go beyond purely technical vulnerability analyses and, depending on the focus, also shed light on organizational aspects such as processes and responsibilities.

In this way, companies can get a holistic picture of the current security status of their cloud environment and identify potential for improvement.

Specifically, penetration tests and audits can contribute to safeguarding by:

• Vulnerability identification: Penetration testing and audits uncover vulnerabilities in cloud configurations, applications, APIs, and infrastructure.
• Validation of security controls: Implemented security measures (e.g. firewalls and network segmentation within the cloud environment, access controls, encryption) are tested for their effectiveness and efficiency.
• Risk assessment: By simulating real-world attacks, the potential extent of a successful attack can be assessed relatively well and prioritization for remediation of the vulnerabilities can be supported.
• Improve incident response: Penetration testing and audits can put existing monitoring to the test, improving the ability of employees to respond appropriately to any security incidents. It can also be used to test the effectiveness of response plans.
• Increase security awareness: The results of penetration testing and audits can help raise overall security awareness within an organization and highlight the need for continuous improvement. Based on the results of penetration tests and audits, suitable measures can then be derived to improve the security of the cloud environment and thus of the company as a whole.