Customisable and automated HTTP header injection. Example run from the HTB machine Control:

InsecureSkipVerify is not currently configured, if you want to disable security checks then feel free to uncomment crypto/tls in the imports and the TLSClientConfig: &tls.Config{InsecureSkipVerify: true}, lines in http transport configuration and then build locally.

go install github.com/mlcsec/headi@latest

Or from git:

git clone https://github.com/mlcsec/headi.git
make before.build
make build.headi
sudo mv headi /usr/local/bin

Injects the following HTTP headers:

• Client-IP
• Connection
• Contact
• Forwarded
• From
• Host
• Origin
• Referer
• True-Client-IP
• X-Client-IP
• X-Custom-IP-Authorization
• X-Forward-For
• X-Forwarded-For
• X-Forwarded-Host
• X-Forwarded-Server
• X-Host
• X-HTTP-Host-Override
• X-Original-URL
• X-Originating-IP
• X-Real-IP
• X-Remote-Addr
• X-Remote-IP
• X-Rewrite-URL
• X-Wap-Profile

An initial baseline request is made to gauge the normal response for the target resource. Green indicates a change in the response and red no change. [+] and [-] respectively.

Two options for HTTP header injection:

1. Default payloads (127.0.0.1, localhost, etc.) are injected into the headers mentioned above
2. Custom payloads can be supplied (e.g. you've enumerated some internal IPs or domains) using the pfile parameter

$ headi
Usage:
  headi -u https://target.com/resource
  headi -u https://target.com/resource -p internal_addrs.txt

Options:
  -p, --pfile <file>       Payload File
  -t, --timeout <millis>   HTTP Timeout
  -u, --url <url>          Target URL

Currently only takes one URL as input but you can easily bash script for numerous URLs like so:

$ for i in $(cat urls); do headi -url $i;done