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Captcha Bypass
To automate the testing of some functions of the server that allows user input it could be needed to bypass a captcha implementation. Test these things:
- Do not send the parameter related to the captcha.
- Change from POST to GET or other HTTP Verbs
- Change to JSON or from JSON
- Send the captcha parameter empty.
- Check if the value of the captcha is in the source code of the page.
- Check if the value is inside a cookie.
- Try to use an old captcha value
- Check if you can use the same captcha value several times with the same or different sessionID.
- If the captcha consists on a mathematical operation try to automate the calculation.
- If the captcha consists on read characters from an image, check manually or with code how many images are being used and if only a few images are being used, detect them by MD5.
- Use an OCR (https://github.com/tesseract-ocr/tesseract).
Support HackTricks and get benefits!
Do you work in a cybersecurity company? Do you want to see your company advertised in HackTricks? or do you want to have access the latest version of the PEASS or download HackTricks in PDF? Check the SUBSCRIPTION PLANS!
Discover The PEASS Family, our collection of exclusive NFTs
Get the official PEASS & HackTricks swag
Join the 💬 Discord group or the telegram group or follow me on Twitter 🐦@carlospolopm.
Share your hacking tricks submitting PRs to the hacktricks github repo.