Borrowing it
Nothing to install: this file belongs to mtnyilmaz/agents. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/mtnyilmaz/agents/main/.agents/skills/sast-ssrf/SKILL.mdgit clone --depth 1 https://github.com/mtnyilmaz/agentsWrote 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/mtnyilmaz/agents/sast-ssrf)<a href="https://agentmods.dev/skills/mtnyilmaz/agents/sast-ssrf"><img src="https://agentmods.dev/badge/skills/mtnyilmaz/agents/sast-ssrf.svg" alt="Measured on agentmods" 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 | $0.00095 | $0.05882 |
| Opus 5 | $0.00048 | $0.02941 |
| Sonnet 5 | $0.00019 | $0.01176 |
| Haiku 4.5 | $0.00010 | $0.00588 |
Grade B, and why
sast-ssrf scanned grade B with 3 findings 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 8d 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.
Cloud metadata endpointmediumServer-side request forgery
One request to 169.254.169.254 can return temporary IAM credentials.
> - **Blocklist of private IP ranges / metadata endpoints**: `169.254.169.254`, `10.0.0.0/8`, `192.168.0.0/16`, etc. — **not** sufficient. Bypassable via DNS rebinding, alternate IP representations, and redirect chains. Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- HTTP client calls where the URL or host is built from user input: `requests.get(user_url)` Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
> - `subprocess.run(["curl", url, ...])`, `subprocess.Popen(["wget", url, ...])` This is a copy
89% identical to sast-ssrf — 103 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 487 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Server-Side Request Forgery (SSRF) Detection
You are performing a focused security assessment to find SSRF vulnerabilities in a codebase. This skill uses a two-phase approach with subagents: recon (find all places that make outbound TCP, DNS, or HTTP requests) then taint (confirm whether user-supplied input influences those call sites).
Prerequisites: sast/architecture.md must exist. Run the analysis skill first if it doesn't.
What is SSRF
SSRF occurs when an attacker can cause the server to make outbound network requests to an arbitrary destination — including internal services, cloud metadata endpoints, or other external targets — by supplying or influencing the URL, hostname, IP, or port used in a server-side request.
The core pattern: unvalidated, user-controlled input reaches the destination argument of an outbound network call.
What SSRF IS
- HTTP client calls where the URL or host is built from user input:
requests.get(user_url) - Fetching a resource whose location is provided by the client:
fetch(req.body.webhook_url) - DNS lookups on a hostname supplied by the user:
dns.lookup(req.query.host) - Raw TCP connections to a host/port derived from user input:
socket.connect((user_host, user_port)) - File-fetching functions used with HTTP/FTP URLs from user input:
file_get_contents($user_url) - URL redirectors that forward to a user-supplied destination without validation
- Webhooks, import-from-URL, screenshot services, PDF renderers, image proxies — any feature that fetches a remote resource on behalf of the user
What SSRF is NOT
Do not flag these:
- Open redirects: Redirecting the browser (HTTP 302) to a user-supplied URL — that's a client-side redirect, not a server-side request
- XSS via URL: Rendering a user-supplied URL in an
<a>tag without escaping — that's XSS - IDOR: Accessing another user's data by changing an object ID — separate vulnerability class
- Hardcoded outbound calls: HTTP requests to fixed, fully hardcoded URLs with no user influence — not SSRF
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.
- 8d ago First seen · 487 lines · 95 tokens per session scan B 7ee48416730d
sast-ssrf is a skill published in the GitHub repository mtnyilmaz/agents (6 stars, last pushed 3mo ago), licensed MIT. It adds 95 tokens to every session and 5,882 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it B with 3 findings (cloud metadata endpoint, makes network calls, runs shell commands). It is 89% identical to sast-ssrf, differing in 103 lines, and is treated as a copy.
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