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http-parameter-pollution

yaklang/hack-skills

HTTP Parameter Pollution (HPP): duplicate query/body keys parsed differently by servers, proxies, WAFs, and app frameworks. Use when filters and application layers disagree on which value wins, enabling bypass, SSRF second URL, logic abuse, or CSRF token confusion.

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安装命令

npx skills add https://github.com/yaklang/hack-skills --skill http-parameter-pollution

SKILL.md

SKILL: HTTP Parameter Pollution (HPP)

AI LOAD INSTRUCTION: Model the full request path: browser → CDN/WAF → reverse proxy → app framework → business code. Duplicate keys (a=1&a=2) are not an error at HTTP level; each hop may pick first, last, join, or array-ify. Test HPP when WAF and app disagree, or when internal HTTP clients rebuild query strings. Routing note: when the same parameter appears multiple times, or WAF/backend stacks differ, use the Section 1 matrix to test first/last/merge assumptions, then design Section 3 scenario chains.

0. QUICK START

Hypothesis: the security check reads one occurrence of a parameter while the action reads another.

First-pass payloads

id=1&id=2
id=1&id=1%20OR%201=1
url=https://legit.example&id=https://evil.example
amount=1&amount=9999
csrf=TOKEN_A&csrf=TOKEN_B
user=alice&user=admin

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