competition-linux-credential-pivot

Imported from zhaoxuya520/reverse-skill (CTF-Sandbox-Orchestrator/competition-linux-credential-pivot/SKILL.md). Install upstream with npx skills add zhaoxuya520/reverse-skill --skill competition-linux-credential-pivot. Copyright stays with the author.

Competition Linux Credential Pivot

Use this skill only as a downstream specialization after $ctf-sandbox-orchestrator is already active and has established sandbox assumptions, node ownership, and evidence priorities. If that has not happened yet, return to $ctf-sandbox-orchestrator first.

Use this skill when the decisive edge is Linux credential material and where that material is accepted.

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Quick Start

1. Separate credential storage from accepted privilege.
2. Record user, process, namespace, socket, key file, and service trust boundary before conclusions.
3. Keep artifact recovery, replay path, and resulting capability in one chain.
4. Distinguish local escalation from lateral host pivot.
5. Reproduce one minimal artifact-to-accepted-access path.

Workflow

1. Map Credential And Trust Artifacts

• Record SSH keys, agent sockets, kubeconfigs, cloud tokens, service-account secrets, env vars, config files, and process memory clues.
• Note sudoers rules, capabilities, setuid binaries, systemd unit context, and namespace boundaries.
• Keep each artifact tied to owner, scope, and expected accepting service.

2. Prove Replay And Pivot

• Show where key, token, socket, or secret is accepted: SSH, API, Unix socket, container runtime, or control-plane endpoint.
• Record host target, protocol, principal, and resulting session or privilege.
• Distinguish authentication success from useful capability gain.

3. Reduce To Decisive Linux Pivot Chain

• Compress to: recovered artifact -> accepted replay path -> pivot host or privilege transition -> resulting capability.
• State whether root cause is weak key handling, token leakage, socket trust, sudo or capability abuse, or namespace crossover.
• If the chain pivots into kernel exploit boundaries, hand off to kernel container escape skill.

Read This Reference

• Load references/linux-credential-pivot.md for artifact checklists, replay matrix, and evidence packaging.

What To Preserve

• Artifact path, owner, scope, accepting service, and resulting principal
• Exact pivot order with protocol and target host or namespace
• One minimal replayable chain proving capability gain