# Bgp Hijacking Concepts

> Understand the mechanics of Border Gateway Protocol (BGP) Hijacking, where an attacker creatively manipulates Internet routing tables to intercept, monitor, or drop massive volumes of network traffic destined for legitimate Autonomous Systems (AS).

- Skill: `shulkwisec/bgp-hijacking-concepts` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds add shulkwisec/bgp-hijacking-concepts`
- Raw SKILL.md: https://api.skillmd.com/api/skills/shulkwisec/bgp-hijacking-concepts/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- License: Apache-2.0
- Author: ShulkwiSEC (https://skillmd.com/u/shulkwisec)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/shulkwisec/bgp-hijacking-concepts

---


# Border Gateway Protocol (BGP) Hijacking

## When to Use
- When conducting highly advanced Red Team engagements involving physical infrastructure attacks, ISP-level threat simulation, or Nation-State adversary emulation.
- To demonstrate how an attacker can maliciously reroute entire blocks of IP addresses (subnets) globally by advertising false routing updates to internet backbone routers.
- *Note: True BGP hijacking requires access to a peered BGP router. This skill primarily focuses on the conceptual understanding, simulation, and defensive modeling of the attack.*


## Prerequisites
- Network access to the target subnet (VPN, pivot, or direct connection)
- Nmap and relevant network scanning tools installed
- Understanding of TCP/IP, common protocols, and network segmentation
- Root/admin access on the attack machine for raw socket operations

## Workflow

### Phase 1: Understanding BGP (The Concept)

```text
# Concept: The Internet is essentially a network of interconnecting networks (Autonomous Systems or AS).
# Border Gateway Protocol (BGP) is the "postal service" of the internet. It dynamically figures out 
# the most efficient path for data to travel from AS1 to AS99.

# Vulnerability: BGP was designed in the 1980s ```

### Phase 2: The Attack (Route Advertisement Spoofing)

```text
# Concept: An attacker controls a BGP router (e.g., AS666). They want to steal traffic destined 
# for a target bank (AS777) which owns the IP block 104.20.0.0/16.

# Step 1: The False Broadcast
# The attacker configures their router to announce to the world: "I am the best, quickest path to 104.20.0.0/24!"
# (Notice they announce a /24, which is a *more specific* route than the legitimate /16).

# Step 2: The Propagation
# BGP routers Step 3: The Intercept Global traffic ```

### Phase 3: Exploitation Techniques (What happens to the traffic?)

```text
# Strategy 1: The Blackhole (Denial of Service)
# The attacker Strategy 2: Man-in-the-Middle (Traffic Inspection)
# Strategy 3: DNS Hijacking ```

#### Decision Point 🔀
```mermaid
flowchart TD
    A[Attacker gains access ] --> B[Attacker ]
    B --> C{Does }
    C -->|Yes| D[Traffic ]
    C -->|No| E[Spoofed ]
    D --> F[Execute ]
```

## 🔵 Blue Team Detection & Defense
- **RPKI (Resource Public Key Infrastructure)**: Implement **BGP Route Monitoring**: Utilize **Prefix Filtering**: ISPS Key Concepts
| Concept | Description |
|---------|-------------|
## Output Format
```
Bgp Hijacking Concepts — Assessment Report
============================================================
Target: [Target identifier]
Assessor: [Operator name]
Date: [Assessment date]
Scope: [Authorized scope]
MITRE ATT&CK: [Relevant technique IDs]

Findings Summary:
  [Finding 1]: [Severity] — [Brief description]
  [Finding 2]: [Severity] — [Brief description]

Detailed Results:
  Phase 1: [Phase name]
    - Result: [Outcome]
    - Evidence: [Screenshot/log reference]
    - Impact: [Business impact assessment]

  Phase 2: [Phase name]
    - Result: [Outcome]
    - Evidence: [Screenshot/log reference]
    - Impact: [Business impact assessment]

Risk Rating: [Critical/High/Medium/Low/Informational]
Recommendations:
  1. [Immediate remediation step]
  2. [Long-term hardening measure]
  3. [Monitoring/detection improvement]
```


## 📚 Shared Resources
> For cross-cutting methodology applicable to all vulnerability classes, see:
> - [`_shared/references/elite-chaining-strategy.md`](../_shared/references/elite-chaining-strategy.md) — Exploit chaining methodology and high-payout chain patterns
> - [`_shared/references/elite-report-writing.md`](../_shared/references/elite-report-writing.md) — HackerOne-optimized report writing, CWE quick reference
> - [`_shared/references/real-world-bounties.md`](../_shared/references/real-world-bounties.md) — Verified disclosed bounties by vulnerability class

## References
- Cloudflare: [What is BGP Hijacking?](https://www.cloudflare.com/learning/security/glossary/bgp-hijacking/)
- MANRS (Mutually Agreed Norms for Routing Security): [https://www.manrs.org/](https://www.manrs.org/)
- Internet Society: [BGP Security](https://www.internetsociety.org/issues/routing-security/)