Security hotspots

What is a security hotspot?

A security hotspot highlights a security-sensitive piece of code that the developer needs to review. Upon review, you'll either find there is no threat, or you need to apply a fix to secure the code.

You can think of hotspots as an example of defense in depth, where several redundant layers of protection are added to an application to make it more resilient in the event of an attack.

Vulnerability or hotspot?

The main difference between a hotspot and a vulnerability is the need for a review before deciding whether to apply a fix:

• With a hotspot, a security-sensitive piece of code is highlighted, but overall application security may not be impacted; It's up to the developer to review the code to determine whether or not a fix is needed to secure the code.
• With a vulnerability, a problem that impacts the application's security has been discovered that needs to be fixed immediately.

An example is the RSPEC-2092, where the use of cookie secure flag is recommended to prevent cookies from being sent over non-HTTPS connections, but a review is needed because:

• HTTPS is the main protection against MITM attacks; the secure flag only acts as additional protection in case of failures in network security.
• The cookie may be designed to be sent everywhere (non-HTTPS websites included) because it's a tracking cookie or similar.

With hotspots, we try to give some freedom to users and educate them on how to choose the most relevant/appropriate protections, depending on the context - budget, threats, etc.

Why are security hotspots important?

While the need to fix individual hotspots depends on the context, you should view security hotspots as an essential part of improving an application's robustness. The more fixed hotspots there are, the more secure your code is in the event of an attack. Reviewing security hotspots allows you to:

• Understand the risk: Understanding when and why you need to apply a fix in order to reduce an information security risk (threats and impacts).
• Identify protections: While reviewing hotspots, you'll see how to avoid writing code that is at risk, determine which fixes are in place, and determine which fixes still need to be implemented to fix the highlighted code.
• Identify impacts: With hotspots, you'll learn how to apply fixes to secure your code based on the impact on overall application security. Recommended secure coding practices are included on the hotspots page to assist you during your review.

Lifecycle

Security hotspots have a dedicated lifecycle. To make status changes, the user needs the Administer Security Hotspots permission. This permission is enabled by default. Users with the Browse permission can comment on or change the user assigned to a security hotspot.

Statuses

Through the lifecycle, a security hotspot takes one of the following statuses:

• To Review: the default status of new security hotspots set by SonarCloud. A security hotspot has been reported and needs to be checked.
• Reviewed: a developer has manually assessed the security hotspot and decided whether or not to apply a fix.

Workflow

Follow this workflow to review security hotspots and apply any fixes needed to secure your code.

Review priority

When SonarCloud detects a security hotspot, it's added to the list of security hotspots according to its review priority from high to low. Hotspots with a high review priority are the most likely to contain code that needs to be secured and require your attention first.

Review priority is determined by the security category of each security rule. Rules in categories that are ranked high on the OWASP Top 10 and CWE Top 25 standards are considered to have a high review priority. Rules in categories that aren't ranked high or aren't mentioned on the OWASP Top 10 or CWE Top 25 standards are rated as medium or low.

Reviewing hotspots

When reviewing a hotspot, you should:

1. Review the What's the risk tab to understand why the security hotspot was raised.
2. From the Are you at risk tab, read the Ask Yourself Whether section to determine if you need to apply a fix to secure the code highlighted in the hotspot.
3. From the How can you fix it tab, follow the Recommended Secure Coding Practices to fix your code if you've determined it's unsafe.

After following these steps, assign one of the following status updates to the security hotspot:

• To Review: if the issue needs to be reviewed.
• Fixed: if you have applied a fix to secure the code highlighted by the hotspot.
• Safe: if the code is already secure and doesn't need to be fixed. (for example, other more relevant protections are already in place).

Review history

The Review history tab shows the history of the security hotspot, including the status that it's been assigned, and any comments the reviewer had regarding the hotspot.