offensive-ssti SKILL.md skillF
offensive-ssti from snailsploit/claude-red is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add snailsploit/claude-red/offensive-ssti@git:20260826.4c7fcfdPins git:20260826.4c7fcfd in mdr.lock. Pin the fingerprint instead.
- Audit grade
- F, 15 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- snailsploit/claude-red
- Path
Skills/web/offensive-ssti/SKILL.md- Versions recorded
- 4
- Latest version
- git:20260826.4c7fcfd, committed Aug 26, 2026
- First version recorded
- May 6, 2026
- Size
- 22,984 bytes
- Repository stars
- 10,442
- License
- MIT
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.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file 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@sha256:9d32478c4b80f3f9The line at the top of this page pins the label git:20260826.4c7fcfd, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_f5ofbisiw4ynyiqg)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between May 6, 2026 and Aug 26, 2026, about one every 37 days. Its first recorded version is graded C and its latest F.
| 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
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
snailsploit/claude-red · 10,442 stars · license MIT · pushed 2026-10-12 · 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 AI assistant 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.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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