Publish Layerfault deep challenge LF-CH-ARCX-0003

CHALLENGE_ORACLE.json

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+{
+  "attack_surface": [
+    "archive-path-advanced"
+  ],
+  "control_type": "positive",
+  "corpus_id": "LF-CH-ARCX-0003",
+  "difficulty": "hard",
+  "expected_decision": "BLOCK",
+  "ground_truth": "synthetic-generated",
+  "layerfault_rule_expectations": {
+    "candidate_rules": [
+      "LF-ARCHIVE-TRAVERSAL"
+    ],
+    "expected_rules": [],
+    "must_not_rules": []
+  },
+  "oracle_ids": [
+    "LF-ORACLE-ARCX-0003"
+  ],
+  "related_cases": [],
+  "repo_name": "archive-backslash-traversal",
+  "safe_fixture": true,
+  "schema": 2,
+  "severity": "medium",
+  "techniques": [
+    "backslash",
+    "traversal"
+  ],
+  "transformations": []
+}

FIXTURE_LAYOUT.json

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+{
+  "artifacts": [
+    "bundle.zip"
+  ],
+  "family": "archivex",
+  "note": "All content is synthetic and inert. Do not treat this as a production model.",
+  "repo_name": "archive-backslash-traversal"
+}

LAYERFAULT_CORPUS.json

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+{
+  "candidate_rules": [
+    "LF-ARCHIVE-TRAVERSAL"
+  ],
+  "challenge": {
+    "attack_surface": [
+      "archive-path-advanced"
+    ],
+    "control_type": "positive",
+    "difficulty": "hard",
+    "expected_decision": "BLOCK",
+    "oracle_ids": [
+      "LF-ORACLE-ARCX-0003"
+    ],
+    "related_cases": [],
+    "severity": "medium",
+    "techniques": [
+      "backslash",
+      "traversal"
+    ],
+    "transformations": []
+  },
+  "corpus_id": "LF-CH-ARCX-0003",
+  "description": "Archive backslash traversal.",
+  "expected_rules": [],
+  "generator": "challenges.generate_challenge",
+  "ground_truth": "synthetic-generated",
+  "must_not_rules": [],
+  "repo_name": "archive-backslash-traversal",
+  "repo_type": "model",
+  "safe_fixture": true,
+  "safety": "inert/canary-only",
+  "schema": 1,
+  "validation": {
+    "kind": "inspect",
+    "target": "bundle.zip"
+  }
+}

README.md

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+---
+license: apache-2.0
+tags:
+- layerfault
+- security-research
+- model-security
+- synthetic
+- adversarial-testing
+extra_gated_prompt: >-
+  This repository is a synthetic security-test artifact from the Layerfault
+  corpus. It intentionally contains adversarial characteristics (e.g.
+  suspicious pickle opcodes, executable-format smuggling, prompt-injection
+  strings) designed to exercise security scanner detection rules. It is
+  **not** a usable ML model and must never be loaded or executed outside an
+  isolated scanner-testing environment. By accepting, you confirm you
+  understand this repository is a test fixture, not production model
+  weights.
+extra_gated_button_content: I understand this is a security test fixture and accept the risk
+gated: auto
+---
+
+# archive-backslash-traversal
+
+> **SECURITY TEST ARTIFACT: DO NOT USE AS A PRODUCTION MODEL**
+
+This repository is part of the Layerfault synthetic security corpus.
+It is deliberately constructed to contain security-relevant characteristics for scanner testing.
+
+**Corpus ID:** `LF-CH-ARCX-0003`
+
+## Purpose
+
+Archive backslash traversal.
+
+## Direct expected Layerfault rules
+
+- None; this repository is a control/comparison input.
+
+## Candidate rules
+
+These are deliberately plausible targets that remain marked as candidates until the exact
+Layerfault build used for certification confirms them.
+
+- `LF-ARCHIVE-TRAVERSAL`
+
+## Negative-control rules
+
+These should remain silent for this corpus item.
+
+- None
+
+## Safety
+
+The corpus uses fake secrets, loopback/`.invalid` network destinations, harmless marker output,
+and synthetic model behavior only. It is intended for static scanning and isolated security testing.
+
+## Challenge classification
+
+- Severity: **medium**
+- Difficulty: **hard**
+- Expected admission decision: **BLOCK**
+- Control type: **positive**
+- Attack surface: archive-path-advanced
+- Techniques: backslash, traversal
+- Transformations: none
+
+### Ground-truth oracle IDs
+
+- `LF-ORACLE-ARCX-0003`
+
+These oracle IDs describe synthetic ground truth. They do not claim that a
+matching Layerfault detector already exists. A challenge may intentionally expose
+a scanner blind spot and remain unmapped until the detector is implemented.

SHA256SUMS.json

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+[
+  {
+    "path": "CHALLENGE_ORACLE.json",
+    "sha256": "692e62d38006ee33eb52c677fe136bc5a1a019bae2e998da9eeadfc6a2c578d3",
+    "size": 634
+  },
+  {
+    "path": "FIXTURE_LAYOUT.json",
+    "sha256": "d133fae55ddb7dca29ff34e2570aa5cd591081542b685852f0b548399133991d",
+    "size": 202
+  },
+  {
+    "path": "LAYERFAULT_CORPUS.json",
+    "sha256": "55f3287b980e3e2b9a1f40afa06990195da5831385b0767b36f410261943ac5d",
+    "size": 864
+  },
+  {
+    "path": "README.md",
+    "sha256": "b62f6e73e938d3e421f0847b470ef6af97444201c4076c12762e8e20a23c1e59",
+    "size": 2215
+  },
+  {
+    "path": "bundle.zip",
+    "sha256": "2c3fc97867f6b62668f89bcc9e779ee925877ca112d8ae80928b5cf41cc66531",
+    "size": 146
+  }
+]

bundle.zip

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+version https://git-lfs.github.com/spec/v1
+oid sha256:2c3fc97867f6b62668f89bcc9e779ee925877ca112d8ae80928b5cf41cc66531
+size 146