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Complete skill folder anatomy across all cybersecurity skills: - scripts/agent.py: 80-150 line Python agents using real libraries (impacket, boto3, azure-mgmt-*, kubernetes, pefile, yara, scapy, shodan, stix2, etc.) - references/api-reference.md: real API documentation with method signatures - LICENSE: MIT license for all skill folders
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API Reference: Testing for XSS Vulnerabilities with Burp Suite
Burp Suite Professional Components
Scanner
- Active scan: Automatically tests parameters for XSS
- Passive scan: Identifies reflected inputs and missing security headers
- Scan configuration: XSS-focused audit checks
Repeater
- Send individual requests for manual payload testing
- Compare request/response pairs across payload variations
- Test character encoding behavior
Intruder
- Positions: Mark injectable parameters
- Payloads: Load XSS wordlists
- Grep-Match: Flag responses containing
alert(,onerror=,<script> - Attack types: Sniper (single param), Battering Ram (same payload all positions)
DOM Invader
- Built-in browser extension for DOM XSS testing
- Canary injection and sink monitoring
- Source-to-sink data flow tracing
requests Library (Companion Script)
Reflection Detection
canary = "xsscanary12345"
resp = requests.get(f"{url}?q={canary}")
if canary in resp.text:
# Determine context and fuzz with payloads
Character Encoding Test
resp = requests.get(f'{url}?q={quote("<>\"\'&/")}'
unencoded = [ch for ch in '<>"\'&/' if ch in resp.text]
Burp Extensions for XSS
| Extension | Purpose |
|---|---|
| Hackvertor | Advanced payload encoding/transformation |
| XSS Validator | Confirm XSS execution in headless browser |
| Reflector | Highlight reflected parameters in proxy |
| Active Scan++ | Enhanced active scanning rules |
CSP Bypass Techniques
| Weakness | Bypass |
|---|---|
unsafe-inline |
Direct <script> injection |
unsafe-eval |
Use eval(), setTimeout() |
| Whitelisted CDN | JSONP callback or Angular gadgets |
Missing base-uri |
<base> tag hijack for relative scripts |
References
- Burp Suite docs: https://portswigger.net/burp/documentation
- PortSwigger XSS labs: https://portswigger.net/web-security/cross-site-scripting
- DOM Invader: https://portswigger.net/burp/documentation/desktop/tools/dom-invader
- Dalfox (CLI scanner): https://github.com/hahwul/dalfox