mirror of https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git synced 2026-06-11 21:54:56 +03:00

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mukul975 c21af3347e Complete folder anatomy for all 649 cybersecurity skills + update LICENSE to Mahipal

- Add scripts/agent.py and references/api-reference.md to all remaining skills
- Update all 648 LICENSE files: copyright now reads 'Mahipal'
- Add implementing-security-monitoring-with-datadog (new skill with full anatomy)
- All 649 skills now have: SKILL.md, LICENSE, scripts/agent.py, references/api-reference.md

2026-03-11 00:22:12 +01:00

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API Reference: Broken Link Hijacking

Concept

Broken Link Hijacking (BLH) occurs when a website links to external resources that no longer exist. An attacker can register the expired resource (domain, GitHub repo, npm package) to serve malicious content via the trusted site.

Hijackable Platforms

Platform	Hijack Vector
GitHub	Register abandoned username/repo
npm	Publish unclaimed package name
PyPI	Register unclaimed package
Twitter/X	Claim abandoned handle
BitBucket	Register abandoned team/repo
Custom domain	Register expired domain

Python requests — Link Checking

HEAD Request

import requests
resp = requests.head(url, timeout=10, allow_redirects=True, verify=False)
# 404 = broken link, potential hijack

Connection Error = Domain Takeover

try:
    requests.head(url, timeout=5)
except requests.ConnectionError:
    print("Domain may be unregistered - takeover possible")

HTML Link Extraction

Regex Patterns

import re
# href links
re.finditer(r'href=["\']([^"\']+)', html)
# src links
re.finditer(r'src=["\']([^"\']+)', html)

Domain Availability Check

WHOIS Lookup

whois expired-domain.com
# "No match for" = available for registration

DNS Check

dig expired-domain.com +short
# Empty = no DNS records (likely available)

GitHub API — Check Username Availability

Check user exists

GET https://api.github.com/users/username

200 = exists
404 = available for registration

Check repo exists

GET https://api.github.com/repos/owner/repo

npm Registry — Check Package

GET https://registry.npmjs.org/package-name

200 = exists
404 = available for registration

Subdomain Takeover Indicators

CNAME to Unclaimed Service

dig CNAME old-service.example.com
# old-service.example.com. CNAME  unregistered.herokuapp.com.

Common Vulnerable Services

Service	Indicator
GitHub Pages	404 "There isn't a GitHub Pages site here"
Heroku	"No such app"
AWS S3	"NoSuchBucket"
Azure	"404 Web Site not found"
Shopify	"Sorry, this shop is currently unavailable"

2.2 KiB Raw Blame History