Least Privilege Access: Fewer Permissions, More Security

The principle of least privilege, also known as the principle of least authority or minimal privilege is a concept from information security. It is based on the idea of limiting IT privileges to the minimum level needed for a specific job. This applies to user accounts, device accounts, applications and so on.

Similar to zero trust, the principle of least privilege treats IT permissions as a potential danger. Access to files and systems can become a liability when faced with insider threats like employee data theft, malware spreading through the network or if an attacker manages to take over an account. Therefore, restricting permissions to the lowest possible level lowers the risk of data breaches.

To enforce the principle of least privilege, organizations need to reduce the initial privileges granted to each employee and carry out regular user access reviews to prevent unnecessary privileges from accumulating over time.

The terms least privilege and need to know are often used interchangeably. In fact, the two concepts have a lot in common: similar to the principle of least privilege, information that is kept need-to-know is shared with as few people as possible, so that only individuals who genuinely need to information have access to it.

However, there are two important differences between least privilege and need to know:

As you can see, least privilege goes further than need to know access because it requires organizations to stick to the lowest permission level possible (such as read-only) and covers non-human accounts in an IT environment.

Segregation of duties (SOD) is based on the idea that no single user should be able to act without supervision. To prevent fraud and conflicts of interest, organizations need to split certain tasks between multiple people. For example, the same person cannot submit expense reports and then approve them for reimbursement.

Segregation of duties adds another layer of complexity by requiring organizations to consider how privileges interact. Permissions that are fine on their own and meet the least privilege standard can still be a problem when put together. To avoid this issue, companies need to implement safeguards to prevent users from holding incompatible permissions.

At this point you may be wondering: How do users end up with unnecessary privileges? Do companies simply provide their employees with too much access? Well, this can happen when organizations do not have an appropriate access control policy, meaning that all staff can access all data – like the hospital that was fined under the GDPR because medical information was open to all IT accounts, from doctors to administrators and facility managers.

The more common scenario, however, are privileges that once served a purpose but remain active for too long. For example, an employee might switch to a new department, but keep the permissions from their old position. The problem isn’t that they weren’t meant to have these privileges, it’s that they were not removed once they became outdated. In organizations that do not audit access, users accumulate permissions over time from projects, collaborations, temporary assignments. This process is also known as privilege creep.

Implementing least privilege access offers many operative, security and compliance benefits. The principle of least privilege allows you to

Maintaining the principle of least privilege is an ongoing process that requires organizations to continuously re-evaluate the permissions, resources and applications of both new and existing accounts. Transitioning to a least privilege model involves a several steps, which we have outlined below.

While it is technically possible to complete the necessary changes and audits by hand, the only realistic way to achieve least privilege in an organization with more than a few dozen employees is through an identity and access management solution like tenfold. Read on to learn how IAM software can assist you with the principle of least privilege.

The first step towards a least privilege model is to ensure that each employee only receives privileges that are absolutely necessary for their business role. The easiest way to make this process secure and consistent is to automate user lifecycle management through role-based access control, i.e. defining default privileges for employees in different departments, positions, etc.

RBAC also has the advantage of automatically revoking privileges when a user’s role changes, such as when changing departments. However, it is still up to you to decide which permissions are really necessary for different user groups. Remember to keep baseline access as low as possible. You can still grant additional privileges on a case-by-case basis later.

If you’re new to the principle of least privilege, chances are accounts in your network currently have a lot of access rights they don’t need. You have two ways of dealing with this problem: either removing all privileges and starting fresh or combing through accounts to audit and delete unnecessary permissions. Which way is the right one depends on how many users you need to deal with and how complicated it would be to re-provisiong them from scratch.

One thing is certain, however: To maintain least privilege access long-term, you need a tool for permission reporting that allows you to identify and correct unintended and potentially problematic access.

Sometimes, users need additional permissions to take on new tasks. The least privilege model shouldn’t stop you from providing employees with the privileges and assets they need to do their jobs. What’s important however, is to keep track of any permissions you grant to make sure they are removed once no longer needed.

Again, the easiest way to support proper documentation is through an automated platform. For example, tenfold‘s self-service interface allows users to request additional permissions, which are then approved or denied by data owners within the corresponding department (freeing up your IT admins for more important tasks). Behind the scenes, tenfold documents every step of this process and automatically adds the new permission to the next audit.

Some apps allow you to define an expiry date when you grant access to another user. For example, when inviting another person to collaborate through Teams, OneDrive or SharePoint, you can set a date when their file link expires. The advantage of this approach should be obvious: When access rights expire on their own, you don’t have to remember to remove them.

Unless a team member genuinely needs permanent access, you should use the temporary access feature whenever you can. Again, IAM tools can add this capability even to services that do not natively support it.

The only way to be sure that no one in your organization has access to data or systems they do not need is to check. User access reviews, a periodic audit of all access rights within your organization, are an essential component of maintaining least privilege.

Conducting these audits can be a hassle, but is made significantly easier by a platform like tenfold, which automatically notifies data owners, compiles pending audits into handy checklists and documents the results for later review or compliance verifications.

As you can see, implementing and maintaining the principle of least privilege is a complex task that all but requires a dedicated access management solution. Unless you plan to personally review hundreds of local and cloud accounts for compliance, month after month, you need an IAM software that lets you automate user provisioning, audit privileges regularly and track permissions across all systems.

tenfold does all this and more. But that’s not what makes our IAM solution so special. No, the truly revolutionary thing about tenfold is just how easy it is to set up and use our platform. Our standardized plugins allow you to connect Windows and Microsoft Cloud services as well as third-party applications in a few simple steps: no coding or scripting required. This way, tenfold is ready to use in just a few weeks, a fraction of the time it would take to set up a comparable IAM system.

Learn more about tenfold‘s powerful and intuitive IAM platform by watching our demo video or request a free trial to explore our software to your heart’s content.

Least Privilege Requirement	Solution in tenfold
Revoke access once no longer needed	tenfold automatically compares users’ privileges to the roles defined by the organization. When an employee’s role changes, tenfold adjusts their permissions as necessary.
Set expiration dates for additional privileges	To provide users with limited-time access, tenfold allows you to add expiration dates to any privileges requested through the self-service platform.
Document all changes to permissions	tenfold ensures that all changes to permissions, from automated workflows to manual requests and changes, are fully documented for review and audit purposes.
Audit permissions regularly	tenfold makes permission reviews easy by notifying data owners and compiling audits into clear checklists. You can choose the review interval yourself, including the option to audit critical systems more frequently.