Why can t I obtain a user token from a compromised API

+1 vote
During a penetration testing exercise, I was able to access a vulnerable API endpoint, but I can’t seem to retrieve any user tokens. I expected that, after compromising the API, I would be able to extract sensitive data, including tokens.

Could there be additional security mechanisms in place preventing token retrieval, or am I missing something in my approach? What might be the reasons for this difficulty, and are there specific techniques for handling this situation when conducting a security assessment?
Oct 25 in Cyber Security & Ethical Hacking by Anupam
• 6,570 points
127 views

1 answer to this question.

+1 vote

During a penetration test, there may be a number of reasons why you can't get a user token back from a compromised API.

1. Access Controls: Strict access controls in the API might prevent you from retrieving tokens or other sensitive data. Make that the user roles or permissions you're employing are appropriate.

2. Encrypting Tokens: Additionally, tokens can be hashed or encrypted. For example, in JWT or JSON Web Tokens, it can only be decrypted by using the right key; it cannot be removed. Check using jwt.io.

echo "your.jwt.token" | cut -d "." -f 1 | base64 --decode

3. Rate limiting: If you make too many requests in a short period of time, the API may block you; search for 429 Too many demands. To prevent being throttled, send your requests slowly.

4. CSRF Protection: In order to process requests, the API could need CSRF tokens. Ensure that your API calls contain these.

5. API Gateway Security: It has the ability to enforce authentication protocols such as OAuth flows or API keys. Make sure you know how to get around these kinds of systems. Data Masking: Sensitive fields may be intentionally hidden by the API. For information on data structure and visibility, consult the API documentation.

6. Firewalls: Some requests may be blocked by network or application firewalls. Make sure your queries follow the anticipated patterns.

Troubleshooting Methods:

1. Review API Documentation: Examine the API documentation to comprehend the necessary parameters and authentication techniques.

2. Use Tools: Use Burp Suite or Postman to alter or examine the request or response.

3. Examine Responses: Keep an eye out for signs of HTTP response code problems, such as the authentication error.

4. Bypass Techniques: To obtain tokens indirectly, try using different user roles or endpoints.

answered Nov 5 by CaLLmeDaDDY
• 9,420 points
Great insights! When it comes to API gateway security, do you have any specific strategies or tools you'd recommend for bypassing OAuth flows?

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