offensive-ssti skillF
offensive-ssti is agent-read markdown (skill) from snailsploit/claude-red: Dense description covering Server-Side Template Injection across Jinja2, Twig, Freemarker, Velocity, Pebble, Smarty, Mako, Handlebars, ERB, Thymeleaf, EJS, Pug. Engine fingerprinting, filter bypass, blind exploitation, WAF evasion, SSTI-to-RCE chains. Tools: tplmap. CWE-1336. MITRE T1190. Use when testing template rendering endpoints or exploiting template injection for code execution..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# Server-Side Template Injection (SSTI) -- Offensive Methodology SSTI exists wherever user-controlled input is concatenated into a server-side template string and the engine evaluates it as code. The engine executes attacker-supplied directives, granting access to the language runtime and, in nearly every engine, remote code execution through the host language's object model. You encounter SSTI in any application passing raw user input to functions like `render_template_string()`, `Template()`, or `compile()`. CWE-1336. MITRE ATT&CK T1190. ## Quick Workflow 1. Map injection surfaces: URL params, POST bodies, JSON values, path segments, headers, cookies. 2. Inject polyglot probes and engine-specific arithmetic expressions; note evaluation, errors, or blank output. 3. Fingerprint the engine via decision-tree probes, error signatures, and variable enumeration (section 1). 4. Confirm server-side execution -- rule out client-side template injection (AngularJS, Vue.js). 5. Escalate to information disclosure: dump config, env vars, secrets, internal paths. 6. Achieve code execution with the engine-specific chain; apply bypass techniques if blocked (section 6). …
Read the whole file at its exact version.
How to install
mdr add snailsploit/claude-red/offensive-ssti@git:20260826.4c7fcfdmdr add snailsploit/claude-red/offensive-ssti@sha256:9d32478c4b80f3f9Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_f5ofbisiw4ynyiqg)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260826.4c7fcfd latest | 2026-08-26 | 4c7fcfd | 22,984 B | F | view · diff |
| git:20260825.f7a0553 | 2026-08-25 | f7a0553 | 26,162 B | F | view · diff |
| git:20260825.900e4c2 | 2026-08-25 | 900e4c2 | 27,987 B | C | view · diff |
| git:20260506.70e0c89 | 2026-05-06 | 70e0c89 | 20,949 B | C | view |
Audit of the latest version
- FAIL, critical: No link to an exfiltration or paste host (matched: http://UNIQUE.oastify.com)
- fail: No link to a raw IP address (matched: http://169.254.169.254)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (22984 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No script tag
Source
snailsploit/claude-red · 6,831 stars · license MIT · pushed 2026-09-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_f5ofbisiw4ynyiqg GET https://markdownregistry.com/api/v1/resolve?ref=snailsploit/claude-red/offensive-ssti GET https://markdownregistry.com/api/v1/blob/9d32478c4b80f3f9c78da1165e0c7523e2443b8f92ed0ae169860322537bf668
Your agent does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
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