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hunt-host-header

Hunt Host Header Injection — password reset poisoning → ATO, web cache poisoning via unkeyed Host/X-Forwarded-Host, routing-based SSRF (Host picks upstream → cloud metadata/internal services), path-override SSRF/ACL-bypass (X-Original-URL/X-Rewrite-URL), OAuth redirect_uri/issuer poisoning, and absolute-URL link poisoning in emails. High to Critical when it reaches ATO or mass cache poisoning. Built on public Host-header research (PortSwigger 'Practical web cache poisoning' + James Kettle, and the classic password-reset-poisoning class). Use on any forgot-password flow, CDN/reverse-proxy-fronted app, OAuth/OIDC endpoint, or absolute-URL-in-email feature.

75

Quality

94%

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SecuritybySnyk

Critical

Do not install without reviewing

SKILL.md
Quality
Evals
Security

Quality

Content

88%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

A highly actionable, well-structured hunting runbook with executable commands and strong validation discipline. The main weakness is mild verbosity in the provenance/mechanism prose and a single-file structure that could offload some detail to references.

Suggestions

Tighten the Grounding/Provenance section to a short citation list; move extended source commentary into a references file to improve conciseness.

Consider extracting the per-phase technique details and header fuzzing lists into a reference bundle so SKILL.md stays a lean overview.

Trim a few redundant mechanism explanations (e.g., restating the 3A vs 3B layer distinction in multiple places) to reduce token cost.

DimensionReasoningScore

Conciseness

Mostly lean and dense with executable commands, and the prose is tactical (false-positive killers, layer distinctions) rather than generic concept padding; however the Grounding/Provenance section and a few mechanism explanations could be trimmed further.

4 / 5

Actionability

Fully copy-paste-ready curl commands across all phases with concrete targets, headers, and confirmation steps covering the common Host-header attack cases.

5 / 5

Workflow Clarity

Phases 1–5 are clearly sequenced with explicit validation checkpoints ('Confirm:', 'False-positive killers (mandatory)'), a dedicated Validation checklist, and demote/feedback logic for false positives.

5 / 5

Progressive Disclosure

Well-organized into clearly headed sections with no nested or buried references, but it is a monolithic single file with no bundle files; some inline content (e.g., provenance/citations) could be split into a reference.

4 / 5

Total

18

/

20

Passed

Description

100%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

A strong, specific description that names concrete attack classes and gives explicit, natural trigger guidance. It uses third person, avoids fluff, and is clearly distinguishable from other skills.

DimensionReasoningScore

Specificity

Lists multiple concrete attack actions — 'password reset poisoning → ATO', 'web cache poisoning via unkeyed Host/X-Forwarded-Host', 'routing-based SSRF', 'path-override SSRF/ACL-bypass', 'OAuth redirect_uri/issuer poisoning', 'absolute-URL link poisoning' — giving comprehensive coverage rather than vague language.

5 / 5

Completeness

Explicitly answers both what (the named Host-header attack classes) and when ('Use on any forgot-password flow, CDN/reverse-proxy-fronted app, OAuth/OIDC endpoint, or absolute-URL-in-email feature') with concrete trigger phrases.

5 / 5

Trigger Term Quality

Comprehensive natural term coverage including synonyms a tester would actually say — 'Host Header Injection', 'password reset', 'forgot-password flow', 'CDN/reverse-proxy', 'OAuth/OIDC', 'SSRF' — not just technical jargon.

5 / 5

Distinctiveness Conflict Risk

A clear niche (Host Header Injection) with distinct, specific triggers unlikely to fire for unrelated skills; minimal overlap risk.

5 / 5

Total

20

/

20

Passed

Validation

93%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation15 / 16 Passed

Validation for skill structure

CriteriaDescriptionResult

frontmatter_unknown_keys

Unknown frontmatter key(s) found; consider removing or moving to metadata

Warning

Total

15

/

16

Passed

Repository
elementalsouls/Claude-BugHunter
Reviewed

Table of Contents

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