Bypass 4xx HTTP response status codes. Based on PycURL.

Script uses multithreading, and is based on brute forcing so might have some false positives. Script uses colored output.

Results will be sorted by HTTP response status code ascending, content length descending, and ID ascending.

To filter out false positives, check each content length manually with the provided cURL command. If it does not results in bypass, just ignore all other results with the same content length.

Test	Scope
Various HTTP methods	method
Various HTTP methods with 'Content-Length: 0' header	method
Cross-site tracing (XST) with HTTP TRACE and TRACK methods	method
File upload with HTTP PUT method	method
Various HTTP method overrides	method-override
Various HTTP headers	header
Various URL overrides	header
URL override with two 'Host' headers	header
Various URL path bypasses	path
Basic authentication/authorization including null session	auth
Broken URL parser check	parser

Extend this script to your liking.

Tested on Kali Linux v2021.4 (64-bit).

Made for educational purposes. I hope it will help!

Future plans:

add option to test only allowed HTTP methods,
do not ignore URL parameters and fragments.

How to Run

Open your preferred console from /src/ and run the commands shown below.

Install required tools:

apt-get install -y curl

Install required packages:

pip3 install -r requirements.txt

Run the script:

python3 forbidden.py

Be aware of rate limiting. Give it some time before you run the script again for the same domain in order to get better results.

Some websites require a user agent header. Download a user agent list from here.

Automation

Bypass 403 Forbidden HTTP response status code:

apt-get install -y curl

Bypass 401 Unauthorized HTTP response status code:

pip3 install -r requirements.txt

Broken URL parser check:

python3 forbidden.py

HTTP Methods

ACL  ARBITRARY  BASELINE-CONTROL  BIND  CHECKIN  CHECKOUT  CONNECT  COPY  DELETE  GET  HEAD  INDEX  LABEL  LINK  LOCK  MERGE  MKACTIVITY  MKCALENDAR  MKCOL  MKREDIRECTREF  MKWORKSPACE  MOVE  OPTIONS  ORDERPATCH  PATCH  POST  PRI  PROPFIND  PROPPATCH  PUT  REBIND  REPORT  SEARCH  SHOWMETHOD  SPACEJUMP  TEXTSEARCH  TRACE  TRACK  UNBIND  UNCHECKOUT  UNLINK  UNLOCK  UPDATE  UPDATEREDIRECTREF  VERSION-CONTROL

HTTP Headers

Client-IP  Cluster-Client-IP  Connection  Contact  Forwarded  Forwarded-For  Forwarded-For-Ip  From  Host  Origin  Referer  Stuff  True-Client-IP  X-Client-IP  X-Custom-IP-Authorization  X-Forward  X-Forwarded  X-Forwarded-By  X-Forwarded-For  X-Forwarded-For-Original  X-Forwarded-Host  X-Forwarded-Server  X-Forward-For  X-Forwared-Host  X-Host  X-HTTP-Host-Override  X-Original-URL  X-Originating-IP  X-Override-URL  X-ProxyUser-IP  X-Real-IP  X-Remote-Addr  X-Remote-IP  X-Rewrite-URL  X-Wap-Profile  X-Server-IP  X-Target

URL Paths

Inject to front, back, and both front and back of URL path; with and without prepending and appending slashes.

count=0; for subdomain in $(cat subdomains_403.txt); do count=$((count+1)); echo "#${count} | ${subdomain}"; python3 forbidden.py -u "${subdomain}" -t method,method-override,header,path -f GET -o "forbidden_403_results_${count}.json"; done

Results Format

count=0; for subdomain in $(cat subdomains_401.txt); do count=$((count+1)); echo "#${count} | ${subdomain}"; python3 forbidden.py -u "${subdomain}" -t auth -f GET -o "forbidden_401_results_${count}.json"; done