HackSkills is an organized knowledge base of installable skills that gives AI agents practical security knowledge across areas such as web security, privilege escalation, reverse engineering, and digital forensics. It is intended for bug bounty work, penetration testing, CTF competitions, and authorized security research. The catalogue entries are the project's own master, category, and topic skills.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add yaklang/hack-skills --skill unauthorized-access-common-servicesgit clone --depth 1 https://github.com/yaklang/hack-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/yaklang/hack-skills/unauthorized-access-common-services)<a href="https://agentmods.dev/skills/yaklang/hack-skills/unauthorized-access-common-services"><img src="https://agentmods.dev/badge/skills/yaklang/hack-skills/unauthorized-access-common-services.svg" alt="Measured on agentmods" height="20"></a>- Socket warn
- Snyk fail
- NVIDIA SkillSpector warn
SkillSpector: 6 findings, up to critical
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- critical YARA Match · line 82 YARA rule matched a known malware signature (reverse shell, backdoor, ransomware, C2 framework, or info stealer).Fix: Remove the malware payload or compromised file entirely. Investigate how it entered the skill and audit all other artifacts for additional indicators of compromise.
- critical YARA Match · line 92 YARA rule matched a known webshell pattern (PHP, Python, JSP, or ASPX webshell).Fix: Remove the webshell code immediately. Webshells provide unauthorized remote command execution. Audit the skill for additional backdoors or persistence mechanisms.
- high YARA Match · line 31 YARA rule matched a hack tool or exploit indicator (offensive tools, reconnaissance, privilege escalation, or exploit frameworks).Fix: Remove offensive tool references and exploit code. Legitimate agent skills should not contain penetration testing tools, exploit frameworks, or reconnaissance utilities.
- high Privilege Escalation · line 348 Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
- high Privilege Escalation · line 380 Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
- medium Data Exfiltration · line 243 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00049 | $0.02820 |
| Opus 5 | $0.00024 | $0.01410 |
| Sonnet 5 | $0.00010 | $0.00564 |
| Haiku 4.5 | $0.00005 | $0.00282 |
Grade A, and why
unauthorized-access-common-services scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl http://TARGET:8088/cluster Copies of this mod
3 near-identical copies found in the catalogue:
- unauthorized-access-common-services — 100% identical, 0 lines differ
- unauthorized-access-common-services — 100% identical, 1 lines differ
- unauthorized-access-common-services — 98% identical, 4 lines differ
How it starts
The opening of the file, as written. The whole thing — 389 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SKILL: Unauthorized Access to Common Services — Expert Attack Playbook
AI LOAD INSTRUCTION: Expert techniques for exploiting unauthenticated or weakly authenticated management services. Covers Redis write-to-RCE, Rsync data theft, PHP-FPM code execution, Ghostcat AJP file read, Hadoop YARN job submission, and H2 Console JNDI. These are infrastructure-level findings distinct from web application vulnerabilities.
0. RELATED ROUTING
- ssrf-server-side-request-forgery when these services are reachable via SSRF (e.g., SSRF → Redis)
- jndi-injection when H2 Console or similar accepts JNDI connection strings
- deserialization-insecure when RMI Registry or T3 protocol is exposed
- network-protocol-attacks for layer 2/3 attacks during service enumeration
- reverse-shell-techniques for shell payloads after gaining command execution
Comprehensive Port Reference
Also load PORT_SERVICE_MATRIX.md when you need:
- Full exploitation matrix organized by port number (20+ services)
- Enumeration, brute force, and post-exploitation per service
- Quick triage during nmap/masscan output analysis
1. DISCOVERY — PORT SCANNING
nmap -sV -p 6379,873,9000,8009,8088,8082,1099,9200,5984,2375,27017,11211 TARGET
# Key ports:
# 6379 — Redis
# 873 — Rsync
# 9000 — PHP-FPM (FastCGI)
# 8009 — AJP (Tomcat Ghostcat)
# 8088 — Hadoop YARN ResourceManager
# 8082 — H2 Console (or embedded in Spring Boot)
# 1099 — Java RMI Registry
# 9200 — Elasticsearch
# 5984 — CouchDB
# 2375 — Docker API
# 27017 — MongoDB
# 11211 — Memcached
2. REDIS (PORT 6379)
Detection
redis-cli -h TARGET ping
# Response: PONG = unauthenticated access confirmed
redis-cli -h TARGET INFO server
# Returns Redis version, OS, config
Write SSH Authorized Keys
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 4d ago First seen · 389 lines · 49 tokens per session scan A cdfdc548c257
unauthorized-access-common-services is a skill published in the GitHub repository yaklang/hack-skills (2,120 stars, last pushed 2mo ago), licensed MIT. It adds 49 tokens to every session and 2,820 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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