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Use an LLM as a Security Judge to Prioritize Codebase Analysis

Create an LLM-powered 'judge' to score and prioritize files in a large codebase for security analysis. This workflow helps focus expensive bug-hunting efforts on the most high-risk areas.

Use an LLM as a Security Judge to Prioritize Codebase Analysis

Tools Used

Claude

Anthropic AI assistant

02Step-by-Step Guide
1

Craft a Security Expert Prompt

Create a detailed prompt that instructs the LLM to act as a security expert. Provide context on the different types of files in your codebase and your security bug classification criteria.

Prompt:
You're a security expert. Here's the different kinds of files we're looking at: C++ files, IPDL files, Web IDL files. Here is some detail about each... Now, give me two scores. One score is how likely do you think there's a memory safety issue? And another is how easy could you access this from a webpage?
2

Request Likelihood and Accessibility Scores

In the prompt, instruct the LLM to provide two scores for each file: 1) The likelihood that the file contains a specific type of vulnerability (e.g., memory safety issue). 2) How easily the code can be accessed by a malicious actor (e.g., from a webpage).

3

Generate a Ranked List

Automate the process of feeding each file (or relevant sections of files) to the LLM with the prompt. Collect the scores and compile a ranked list of files, sorted from most to least likely to contain a critical vulnerability.

4

Feed the Prioritized List to a Bug Hunter

Use the ranked list as the input for a more resource-intensive process, such as an automated bug-hunting agent. This ensures that your compute resources are focused on the highest-impact targets first.

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