RAMEWORKS FOR CLOUD COMPUTING: A CRITICAL REVIEW

International Journal of Computer Science & Information Technology (IJCSIT) Vol 8, No 4, August 2016
DOI:10.5121/ijcsit.2016.8401 1
RISK MANAGEMENT FRAMEWORKS FOR CLOUD
COMPUTING: A CRITICAL REVIEW
Rana Alosaimi1
and Mohammad Alnuem2
Department of Information Systems, King Saud University, Riyadh, Saudi Arabia
ABSTRACT
Cloud computing technology has experienced exponential growth over the past few years. It provides many
advantages for both individuals and organizations. However, at the same time, many issues have arisen due
to the vast growth of cloud computing. Organizations often have concerns about the migration and
utilization of cloud computing due to the loss of control over their outsourced resources and cloud
computing is vulnerable to risks. Thus, a cloud provider needs to manage the cloud computing environment
risks in order to identify, assess, and prioritize the risks in order to decrease those risks, improve security,
increase confidence in cloud services, and relieve organizations’ concerns on the issue of using a cloud
environment. Considering that a conventional risk management framework does not fit well with cloud
computing due to the complexity of its environment, research in this area has become widespread. The aim
of this paper is to review the previously proposed risk management frameworks for cloud computing and to
make a comparison between them in order to determine the strengths and weaknesses of each of them. The
review will consider the extent of the involvement and participation of consumers in cloud computing and
other issues.
KEYWORDS
Cloud Computing; Risk Management & Information Security
1. INTRODUCTION
Cloud computing is a new paradigm shift in the technological industry which will continue to
grow and develop in the next few years. The rate of organizations migrating to a cloud computing
environment is increasing daily due to its advantages [1, 2]. The major cloud computing
advantages which benefit organizations are: high scalability and flexibility in organizations’
resources in order to meet peak time demand, excellent reliability and availability in that
resources can be accessed from anywhere and at any time, and there is no upfront cost for
installing and managing the software and hardware infrastructure [3, 4, 5, 6].
On the other hand, cloud computing also has brought many risks to organizations due to the fact
that they outsource IT resources which make services completely managed and delivered by a
third party. Therefore, such organizations might lose control over how they secure their
environment and they might be concerned with privacy and security as the new technology is a
major source of new vulnerabilities in these areas [7, 8, 9, 10]. Therefore, it is important to
establish several controls which will work together to decrease the risks, provide layered security,
increase confidence in cloud services, and relieve the fear of using a cloud computing
environment. Risk management is one of the cloud computing environment controls which aims
to assess and manage risks related to cloud computing and to prevent those risks from impacting
business goals.

2
This paper will provide a systematic review of the previously proposed risk management
frameworks for cloud computing environments. The paper will be organized as follows. In
section II, an overview of the two main subjects – cloud computing and risk management – will
be provided. Section III will include reviews of relevant work on previously proposed cloud
computing risk management frameworks. Section IV will present the advantages and
disadvantages of each of them. Section V will include a discussion of the results of the review
and a comparison of the frameworks. Section VI will conclude the paper and will include
recommendations for future work in this area.
2. BACKGROUND
2.1. CLOUD COMPUTING
Cloud computing is a new type of computing model extended from distributed computing,
parallel computing, and grid computing. It provides various additional features to users such as
secure, quick, and convenient data storage and a net computing service centred on the Internet.
The factors that have propelled the frequency of occurrence and development of cloud computing
include the development of grid computing, the appearance of high-quality technology in storage
and data transportation, and the appearance of Web 2.0 – especially the development of
virtualization [11]. Cloud computing consists of five essential characteristics: on-demand self-
service, broad network access, resource pooling, rapid elasticity, and measured service [12, 13].
Cloud computing generally provides services on three main diverse levels [14, 15]. These models
are:
• Software as a Service (SaaS) – cloud computing delivers an application which is already
customied with all of the required hardware, software, operating system, and network to be
accessible by various consumers (regardless of their location) by using the Internet without the
need to install software on the servers [16].
• Platform as a Service (PaaS) – cloud computing offers a developmental environment and all
the developers’ requirements (such as software tools, libraries, programming languages, and
services for cloud consumers to develop or install their own software and applications). The
applications are then delivered to the users via the Internet [17].
• Infrastructure as a Service (IaaS) – cloud computing offers fundamental computing resources
(such as processing, servers, storage, and networks) and virtualization technology for
consumers to install and run their own operating systems and applications [18].
Furthermore, cloud computing services can be deployed in four ways dependent on consumers’
requirements [19]. These four deployment models are:
• Public Cloud – the cloud infrastructure and computing resources are made available to public
consumers over a public network. Multiple organizations can work on and access the provided
infrastructure at the same time. The public cloud model is controlled and managed by a third
party: a cloud provider [5, 20].
• Private Cloud – cloud services are dedicated only to a specific consumer (organization) and
offer the highest security of client data and greater control over the cloud infrastructure. A
private cloud may be managed and owned by the organization itself or a cloud provider [21].

3
• Community Cloud – in a community cloud, the cloud infrastructure is provisioned for a group
of consumers (organizations) which have the same shared demands. They can share resources
by using the connections between the associated organizations. The community cloud is
similar to a private cloud in that it can be managed and owned either by the relevant
community organizations or a cloud provider [5, 20].
• Hybrid Cloud – A hybrid cloud is a mixture of two or more types of cloud deployment models
(public, private, or community) which are connected together to allow for the transfer of data
and application between them but without affecting each other [21].
2.2. RISK MANAGEMENT
Organizations usually face and are exposed to several types of risk (e.g. policy, programme,
operational, project, financial, human resources, technological, health, safety, and political risks)
[22]. The International Organization for Standardization (ISO) defined risk as “the effect of
uncertainty on objectives”. Otherwise, the risk is expressed as a combination of the consequences
of an event and the associated probability of occurrence [23].
Risk management is a systematic mechanism for managing the risks or threats facing an
organization in order to enable it to recognize the events that may result in unfortunate or
damaging consequences and to establish the best course of action for identifying, assessing,
understanding, acting on, and communicating risk issues [22, 24]. Risk management adds value
and offers many objectives to an organization. Some of these objectives are: increasing system
security, protecting and enhancing the organization’s assets, making well-informed decisions, and
optimizing operational efficiency [25, 26].
3. RISK MANAGEMENT FRAMEWORKS IN CLOUD COMPUTING
The researchers’ efforts are based on three different perspectives on cloud computing risk
assessment. The first proposed risk assessment frameworks can be used only by a cloud
computing consumer. It was suggested that, in some cases, risk should be transferred to the cloud
provider or a trusted third party [27, 28]. However, these researchers ignore the fact that the cloud
provider owns and manages the infrastructure of the cloud environment and cannot disclose their
security models and procedures to anyone who might be a malicious user. On the other hand,
other researchers have proposed risks should only be assessed by the cloud provider, without
taking into account the importance of involving the cloud consumers in the process because the
cloud provider is the real owner of the data and the only party who knows the real value of the
assets in the cloud environment [29, 30]. Thereafter, some researchers believed in the importance
of involving the consumers in the risk assessment process [31, 32, 33]. When and to what extent
the consumers are involved in this process was considered differently by the different proposed
risk assessment frameworks.
3.1. RISK MANAGEMENT BY CLOUD CONSUMERS
Saripalli and Walters [27] presented a quantitative framework by which the impact and risk of
cloud security (based on the Federal Information Processing Standards (FIPS)) can be assessed
[25]. Thus, in addition to the security objectives already defined by the US Federal Information
Security Management Act (FISMA) for information and information systems – confidentiality,
integrity, and availability – Saripalli and Walters added three more security objectives in the
context of cloud platforms – multiparty trust, mutual auditability, and usability. These six security
objectives of cloud platforms are referred to as the CIAMAU framework. The typical threats and

4
events are mapped into one or more of these six categories. Saripalli and Walters assessed risk as
a combination of the probability of a security threat event and its measured consequence or
impact. The probability of a threat event is assessed by using statistical data and the impact of a
threat event is evaluated based on expert opinions by using the modified Wideband Delphi
method to collect the necessary information [34].
Tanimoto, et al. [28] considered the risk factors in cloud computing from a consumer’s viewpoint
based on the risk breakdown structure (RBS) method. Their study aimed to address three main
security subjects in terms of the cloud environment: the security guarantees in a disclosure
environment, the existence of two or more stakeholders, and mission critical data problems. They
classified the risk factors into three main divisions: risks for a company which is introducing
cloud computing, risks for a cloud service provider, and risks for others. Therefore, in terms of
risk analysis, a hybrid method has been proposed based on a quantitative decision tree analysis
and the qualitative risk matrix method. Thus, the risk matrix method categorizes risk into four
classifications in accordance with the degree of incidence and generation frequency: risk
avoidance, risk mitigation, risk acceptance, and risk transference. Consequently, the analyzed and
evaluated risks and a detailed countermeasure and proposal have been produced based on these
results.
3.2. RISK MANAGEMENT BY A CLOUD PROVIDER
Fito, et al. [29] proposed a semi-quantitative BLO-driven cloud risk assessment (SEBCRA)
approach which is based on the Federation of European Risk Management Association’s
standards [35]. Fito, et al.’s risk management procedure aims to determine the risk impacts (either
positive or negative) on the level of the business objectives (BLOs) of a given cloud organization
instead of its impact on the whole cloud environment. Therefore, their risk management
framework involves these steps: SEBCRA (the overall process of risk analysis and evaluation),
risk reporting and communication, risk treatment, and risk monitoring. SEBCRA was proposed as
it is a core sub-process by which cloud risks can be prioritized according to their impact and
consequences on different BLOs. In the risk analysis process, Fito, et al. used a standard level
matrix to extract the risk level estimation (RLE) as the output for each of the affected BLOs,
which is the product of the risk probability and its impact on the BLO. Thus, any risks in which
RLE is within unacceptable ranges and has a negative impact on the BLOs are avoided and this
has the benefit of leading to an improvement in achieving the BLOs.
Zhang, et al. [30] presented an information risk management framework for cloud computing
which covers all cloud service models and cloud deployment models. The framework is based on
the evolving ISO/IEC 27001 standards [36], the NIST risk management guide for information
technology systems [25], and the Booz Allen Hamilton information security governance [37].
Furthermore, it is similar to the traditional standard quality management (Plan, Do, Check, Act)
cycle of continuous improvement and involves seven processes: selection of the relevant critical
areas, strategy and planning, risk analysis, risk assessment, risk mitigation, the assessment and
monitoring programme, and risk management review. Thus, Zhang, et al. focused on critical areas
in cloud computing which must be protected and designed in order to protect the security
objectives of information assets: confidentiality, integrity, and availability. In addition, risk
analysis and assessment processes, threats, vulnerability identification, and assessment of the
output from the identification can ascertain the risk levels (High, Medium, and Low) of relevant
critical areas which were selected previously from 12 critical areas which address both tactical
and strategic security.

5
3.3. RISK MANAGEMENT BY CLOUD PROVIDERS AND CONSUMERS
Almorsy, et al. [31] proposed a security management framework aimed at improving
collaboration between cloud providers, service providers, and service consumers in terms of
managing the security of the cloud platform and the hosted services. Cloud consumers are advised
to participate in every step of the risk assessment processes in order to extend their security
management process (SMP) to include cloud-hosted assets. The framework has been introduced
based on aligning the NIST-FISMA standard with the cloud computing model [38]. Almorsy, et
al.’s framework consists of three main layers: a management layer, an enforcement layer, and a
feedback layer. The framework includes six main phases: service security categorization, security
controls selection, security controls implementation, security controls assessment, service
authorization, and security monitoring. Their security management framework can be applied to
each developed and deployed service in cloud computing and it is considered the overall security
categorization for each service.
Xie, et al. [32] presented a risk management framework which includes users, providers, and third
party agencies. The main aim of their framework is for cloud providers to ascertain a user’s
requirements clearly and to enhance the trust between them. The framework is composed of five
basic processes: user requirement self-assessment, cloud service providers’ desktop assessment,
risk assessment, third party agencies review, and continuous monitoring. In the user requirement
self-assessment phase, the user should determine the required cloud computing service and
deployment model and the security level of authentication, access control, auditing, data integrity,
etc. in order to determine potential cloud providers based on these selections. Thus, the aims of
the cloud providers’ desktop assessment phase are to evaluate the plans of those candidates and to
review their past security levels. The risk assessment phase consists of seven stages: preparation
of the risk assessment, asset identification, threat identification, vulnerability identification,
existing security measures, risk analysis, and risk assessment documentation. The third party
agencies review phase involves authoritative security evaluation institutions (including the review
group and expert group) which review the procedures of the security assessment plan of the user.
Albakri, et al. [33] proposed a security risk assessment framework based on the SaaS model with
a public deployment model based on the ISO/IEC 27005 standard. The framework considered
both the cloud provider and the cloud consumer in the risk assessment process by providing a
dynamic relationship between them. They aim to balance the realistic results which will derive
from the participation of consumers and the potential complexity which may occur due to their
involvement. Thus, cloud computing consumer participation in risk management processes is
limited to only three tasks: determining the regulatory and legal requirements, determining the
security risk factors, and getting feedback from the cloud provider and applying the required
security tasks. Therefore, their framework consists of six phases: context establishment, risk
assessment, risk treatment, risk acceptance, risk communication and consultation, and risk
monitoring and review. In the context establishment process, each consumer should start its own
context establishment for its data which will move to the cloud environment to define legal
compliance. Furthermore, the same applies to the risk assessment process. Each consumer should
identify the risk for its own data which will move to the cloud. Thereafter, the cloud provider will
be able to perform a risk analysis and the rest of the processes for its entire infrastructure and
consumers’ data.
4. RISK MANAGEMENT FRAMEWORKS PROS AND CONS
There is no perfect risk management framework and, due to the complexity of the cloud
computing environment, there are many reasons which could make a framework more effective or

6
which could reduce its effectiveness. Table 1 below represents the strengths and weaknesses of
each of the above mentioned security risk management frameworks which have been proposed
for use in a cloud computing environment.
Table 1. Risk Management Frameworks Advantages and Disadvantages.
Research
paper
Advantages Disadvantages
Saripalli and
Walters
• The approach is fully
iterative convergence and
enables a comparative
assessment of the relative
robustness of different cloud
vendor offerings in a
defensible manner.
• It proposes three additional
specific security objectives
for a cloud environment to be
appropriate for a cloud
security risk assessment.
• It requires the careful and precise
collection of input data for a
probability calculation of threat
events, which needs to be used to
assess cloud computing risks.
• It only focuses on risk assessment,
which is only one step in the risk
management process. The remaining
steps are still required.
• A quantitative risk assessment
method has been used; thus, the
results may be confusing and even
imprecise. In addition, the method is
expensive and requires solid
experience with advanced tools.
• The risk assessment has focused
only on the cloud consumer and has
overlooked that the cloud provider is
the manager and owner of the cloud
infrastructure.
Tanimoto, et
al.
• This approach analyses and
ascertains the risk factors of
cloud computing and gives
detailed countermeasures.
• It uses a combination of
quantitative and qualitative
methods for risk analysis and
achieved the advantages of
both. It has avoided bias and
inaccuracy in the assessment
results.
• It lacks a risk identification process
for the threats, vulnerabilities, and
assets of a cloud computing
environment.
• The risk factors were ascertained
only from the consumers’
viewpoints and the approach
overlooked that the cloud provider is
the manager and owner of the cloud
infrastructure.
Fito, et al.
• This approach evaluates the
impact of cloud risks on the
BLOs of a cloud
organization, instead of
considering the impacts on
the whole cloud environment.
It therefore has strong focus
and precision.
• It uses a combination of
quantitative and qualitative
methods for risk analysis and
achieves the advantages of
• There is no explanation for the risk
identification method, which is an
important and critical process in the
risk assessment of cloud
environment.
• The impact of risks has been
evaluated based only on the BLOs
of a cloud provider and has
overlooked consumers’ objectives
and the fact that the cloud consumer
is the real owner of the data assets.

7
both. It has avoided bias and
inaccuracy in the assessment
results.
Zhang, et al.
• The risk management was
based on selecting critical
areas in a cloud computing
environment, which makes
the risk assessment process
strongly focused.
• The risk management was semi-
static because the list of critical
areas was fixed. This may make the
risk assessment of the cloud
environment inflexible and some of
the risks may be ignored.
• A qualitative risk assessment
method was followed. This makes
the costs and benefits analysis
during the selection of
recommended controls difficult.
• The risk management has focused
only on the cloud provider and has
overlooked that the cloud consumer
is the real owner of the data assets.
Almorsy, et
al.
• This approach tackles the
loss of trust and security
control problems by enabling
cloud consumers to extend
their SMP to include cloud-
hosted assets.
• It mitigates the loss of control
for cloud providers in terms
of the hosted services
developed by other parties.
• The security management
framework was undertaken
separately for each of the
provided services. This is
where the problem of multi-
tenancy lies.
• Cloud consumers were involved in
every step of the risk assessment
processes. This complicates the risk
assessment processes, particularly
when the number of consumers
increases.
Xie, et al.
• This approach analyses the
security status of cloud
service providers by
reviewing historical
incidents.
• It introduces third party
assessment agency to ensure
the effectiveness and safety
• Consumer involvement was not
really considered to be active in the
risk assessment process, which is
only able to decide the security level
in general and to select a cloud
computing service and deployment
model.
• Consumers are only involved in

8
of cloud computing
applications.
determining the appropriate cloud
providers based on their
requirements.
• There is a lack of risk treatment or
acceptance in terms of the
appropriate action to be taken for
each risk.
Albakri, et
al.
• This approach activates the
involvement of consumers in
the risk management process.
• It tries to balance between the
benefits of the participation
of consumers and the
complexity caused thereby.
• The involvement of consumers
involves notifying them at each
phase that their participation is
needed and completion of their
responses must be awaited. This
could disrupt or delay the process.
• The cloud computing consumer
does not participate in risk treatment
and acceptance. It is the consumer
who experiences the risks to its own
assets and, therefore, they should
make the decision.
method has been followed. This
makes the costs and benefits
analysis during the selection of
5. RESULTS AND DISCUSSION
Based on the review of several frameworks proposed previously by different authors, it can be
confirmed that the traditional risk management may fail and may not fit well with a cloud
computing environment. Thus, the strengths and weaknesses of those frameworks lead to a
conclusion that some of key issues should be taken into account when applying a risk
management framework to a cloud computing environment. These issues are outlined as follows:
• The involvement of consumers in the risk management process is important because they are
the only ones who know the value of their assets.
• Consumer participation should not be limited to the extent of inactivity and consumers should
not be involved in each step to the extent of complicating the process.
• Context establishment and risk identification (sub-processes of risk assessment) are critical
processes in risk management.
• The participation of cloud consumers in the risk treatment process is significant due to the fact
that they are part of the problem; therefore, they must be a part of the solution.
• It is preferable for the risk assessment process to be performed for each of the provided
services separately in order to handle conflicts in the consumers’ security requirements, due to
the multi-tenancy feature of cloud computing.

9
• The conflict between consumers which appears in the risk identification process should be
handled well in order to implement their security requirements and to achieve consumer
satisfaction.
• It is advisable to use a combination of quantitative and qualitative methods in the risk analysis
process in order to benefit therefrom and to avert their disadvantages.
6. CONCLUSION AND FUTURE WORK
The conventional risk management framework does not fit well with a cloud computing
environment due to its specific characteristics. Therefore, several studies have been
conducted on risk management in cloud computing. There are no specific criteria by
which a risk management framework can be considered very bad or very good. A perfect
risk management framework cannot be achieved. On the other hand, a particular
framework can be decided on the basis of whether it is appropriate and effective or not
based on a cloud environment.
This paper has reviewed the previously proposed risk management frameworks in cloud
computing with specific regards to the participation of consumers therein and has
determined the strengths and weaknesses of each. It was concluded that some specific
issues are important when proposing a risk management framework for a cloud
computing environment.
In future work, the researchers hereof propose a new risk management framework which
takes the advantages of the previously proposed risk management frameworks and averts
their disadvantages.
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final.pdf
AUTHORS
Rana Musaad Alosaimi is a Master student of Information Systems at the College of Computer and
Information Sciences of King Saud University (KSU), Saudi Arabia. She received her bachelor's degree in
Information Technology from the same university. Her fields of research interests include Information
Systems, Cloud Computing, and Information Security.
Mohammed Abdullah Alnuem is an Assistant Professor in the field of Computer Science, in the college
of Computer and Information Sciences, King Saud University, Saud Arabia. Further, he is also serving as
Vice Dean for Development and Quality in E-Transactions and Communications. He received his PhD in
Mobile Computing and Networks from the school of Informatics, University of Bradford, UK and M.S. in
Distributed Systems and Networks from the same university. His fields of research interests include
Computer Networks, Distributed Systems, Wired and Wireless Networks and Software Engineering.

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