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You Should Know:
Bug bounty hunting often involves searching for leaked keys and secrets in code repositories, logs, or other publicly accessible data. Using regex (regular expressions) can significantly streamline this process. Below are some practical steps, commands, and code snippets to help you get started:
1. Basic Regex for Leaked Secrets
- Regex Pattern: `(api_key|secret_key|password|token)=[“‘]?([a-zA-Z0-9_-]+)[“‘]?`
– This pattern matches common secret keys, API keys, passwords, and tokens.
2. Using Regex with `grep` in Linux
- Command:
grep -E "(api_key|secret_key|password|token)=['\"]?([a-zA-Z0-9_-]+)['\"]?" /path/to/file
- This command searches for secrets in a specific file.
3. Searching Across Multiple Files
- Command:
grep -rE "(api_key|secret_key|password|token)=['\"]?([a-zA-Z0-9_-]+)['\"]?" /path/to/directory
- This recursively searches through all files in a directory.
4. Python Script for Regex Search
- Code:
import re</li> </ul> pattern = r"(api_key|secret_key|password|token)=['\"]?([a-zA-Z0-9_-]+)['\"]?" with open("file.txt", "r") as file: content = file.read() matches = re.findall(pattern, content) for match in matches: print(f"Found: {match[0]} = {match[1]}")– This script reads a file and prints any matches for the regex pattern.
5. Windows PowerShell Command
- Command:
Select-String -Path "C:\path\to\file.txt" -Pattern "(api_key|secret_key|password|token)=['\""]?([a-zA-Z0-9_-]+)['\""]?"
- This PowerShell command searches for secrets in a file on Windows.
6. Automating with Tools
- Tool: TruffleHog
- TruffleHog is a popular tool for scanning repositories for secrets using regex and entropy checks.
- Command:
trufflehog --regex --entropy=False file:///path/to/repo
What Undercode Say:
Mastering regex for bug bounty hunting is a crucial skill for identifying leaked keys and secrets. By leveraging tools like
grep, Python scripts, and specialized tools like TruffleHog, you can efficiently scan codebases and logs for sensitive information. Always ensure you have permission before scanning any system or repository, and follow ethical guidelines in your bug bounty endeavors.Additional Resources:
- Regex101 – A great tool for testing and debugging regex patterns.
- OWASP Regex Cheat Sheet – A comprehensive guide to regex for security professionals.
By incorporating these techniques into your workflow, you can enhance your bug bounty hunting skills and uncover vulnerabilities more effectively.
References:
Reported By: Deepak Saini – Hackers Feeds
Extra Hub: Undercode MoN
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