exploiting-broken-link-hijacking

name	exploiting-broken-link-hijacking
description	Discover and exploit broken link hijacking vulnerabilities by identifying references to expired domains, decommissioned cloud resources, and dead external services that can be claimed by an attacker. Use when working with exploiting broken link hijacking.
domain	cybersecurity
tags	["broken-link-hijacking","blh","subdomain-takeover","dead-link","expired-domain","supply-chain","external-resource"]
subdomain	web-application-security
version	1.0
author	oyi77
license	Apache-2.0
nist_csf	["PR.PS-01","ID.RA-01","PR.DS-10","DE.CM-01"]

Exploiting Broken Link Hijacking

Overview

Cybersecurity skill for exploiting broken link hijacking. Follows industry best practices and security standards.

When to Use

Trigger phrases:

• "exploiting broken link hijacking"

• "Discover and exploit broken link hijacking vulnerabilities by identifying refere"

• When auditing web applications for references to expired or unclaimed external resources

• During supply chain security assessments of third-party script and resource dependencies

• When testing for subdomain takeover opportunities via dangling CNAME records

• During bug bounty hunting for broken link hijacking vulnerabilities

• When assessing the security of external resource dependencies in production applications

When NOT to Use

• When you lack proper authorization for testing
• For production systems without change management
• When the task requires legal or compliance expertise beyond technical scope

Prerequisites

• Web crawler or spider for discovering all external links (Burp Suite Spider, Scrapy)
• DNS lookup tools for checking CNAME records and domain availability
• Domain registrar access for claiming expired domains (as proof of concept)
• Understanding of CDN and cloud service provisioning (S3, Azure Blob, GitHub Pages)
• blc (broken-link-checker) or similar tool for automated link validation
• Knowledge of services vulnerable to subdomain takeover (can-i-take-over-xyz)

Legal Notice: This skill is for authorized security testing and educational purposes only. Unauthorized use against systems you do not own or have written permission to test is illegal and may violate computer fraud laws.

Workflow

# Example: IOC detection
import re

IOC_PATTERNS = {
    "ip": r"\b(?:\d{1,3}\.){3}\d{1,3}\b",
    "domain": r"\b[a-z0-9-]+\.[a-z]{2,}\b",
    "hash_md5": r"\b[a-f0-9]{32}\b",
    "hash_sha256": r"\b[a-f0-9]{64}\b",
}

def () -> :
     {k: re.findall(v, text)  k, v  IOC_PATTERNS.items()}