Performing Vlan Hopping Attack

Performing Vlan Hopping Attack

Overview

Cybersecurity skill for performing vlan hopping attack. Follows industry best practices and security standards.

When to Use

Trigger phrases:

• "performing vlan hopping attack"

• "Simulates VLAN hopping attacks using switch spoofing and double tagging techniqu"

• Testing the effectiveness of VLAN-based network segmentation during authorized penetration tests

• Validating that switch trunk port configurations prevent unauthorized VLAN access

• Assessing whether 802.1Q tagging and native VLAN configurations resist double-tagging attacks

• Demonstrating to network teams why proper switch hardening is critical for isolation between zones

• Verifying that DTP (Dynamic Trunking Protocol) is disabled on all access ports

Do not use on production switches without explicit authorization and change management approval, against critical infrastructure VLANs (SCADA, medical devices) without safety controls, or as a denial-of-service vector.

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

• Written authorization specifying in-scope VLANs and switches for testing
• Physical or virtual access to a switch access port on the target network
• Yersinia, Scapy, and frogger VLAN hopping tools installed on Kali Linux
• Understanding of 802.1Q trunking, DTP, and VLAN tagging at the frame level
• Access to switch CLI for verification of configurations (read-only is sufficient)
• Wireshark for capturing and verifying tagged frames

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 extract_iocs(text: str) -> dict:
    return {k: re.findall(v, text) for k, v in IOC_PATTERNS.items()}

1. Plan Operations — Define objectives, scope, and success criteria for vlan hopping attack operations.
2. Prepare Environment — Set up tools, access, and data sources required for vlan hopping attack.
3. Execute Core Workflow — Perform the vlan hopping attack operations following established procedures.
4. Validate Results — Verify that results meet quality standards and objectives.
5. Report Findings — Document results, observations, and recommendations.
6. Follow Up — Track remediation actions and verify fixes where applicable.

Tools

• Analysis Platform — Data processing and visualization
• Collaboration Tools — Team coordination and knowledge sharing

Process

1. Reconnaissance — Gather target information, identify attack surface, enumerate services
2. Analysis/Exploitation — Execute the technique, analyze results, document findings
3. Reporting — Document IOCs, write findings, provide remediation recommendations

Verification

• All vlan hopping attack procedures executed completely and documented
• Findings validated against multiple data sources
• False positives identified and filtered
• Results documented with evidence and timestamps
• Recommendations provided with risk-based prioritization

Anti-Rationalization Table