hacktricks/generic-methodologies-and-resources/pentesting-network/eigrp-attacks.md

# EIGRP Attacks

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**This is a summary of the attacks exposed in** [**https://medium.com/@in9uz/cisco-nightmare-pentesting-cisco-networks-like-a-devil-f4032eb437b9**](https://medium.com/@in9uz/cisco-nightmare-pentesting-cisco-networks-like-a-devil-f4032eb437b9). Check it for further information.

## **Fake EIGRP Neighbors Attack**
    
- **Objective**: To overload router CPUs by flooding them with EIGRP hello packets, potentially leading to a Denial of Service (DoS) attack.
- **Tool**: **helloflooding.py** script.
- **Execution**:
    %%%bash
    ~$ sudo python3 helloflooding.py --interface eth0 --as 1 --subnet 10.10.100.0/24
    %%%
- **Parameters**:
    - `--interface`: Specifies the network interface, e.g., `eth0`.
    - `--as`: Defines the EIGRP autonomous system number, e.g., `1`.
    - `--subnet`: Sets the subnet location, e.g., `10.10.100.0/24`.

## **EIGRP Blackhole Attack**

- **Objective**: To disrupt network traffic flow by injecting a false route, leading to a blackhole where the traffic is directed to a non-existent destination.
- **Tool**: **routeinject.py** script.
- **Execution**:
    %%%bash
    ~$ sudo python3 routeinject.py --interface eth0 --as 1 --src 10.10.100.50 --dst 172.16.100.140 --prefix 32
    %%%
- **Parameters**:
    - `--interface`: Specifies the attacker’s system interface.
    - `--as`: Defines the EIGRP AS number.
    - `--src`: Sets the attacker’s IP address.
    - `--dst`: Sets the target subnet IP.
    - `--prefix`: Defines the mask of the target subnet IP.

## **Abusing K-Values Attack**

- **Objective**: To create continuous disruptions and reconnections within the EIGRP domain by injecting altered K-values, effectively resulting in a DoS attack.
- **Tool**: **relationshipnightmare.py** script.
- **Execution**:
    %%%bash
    ~$ sudo python3 relationshipnightmare.py --interface eth0 --as 1 --src 10.10.100.100
    %%%
- **Parameters**:
    - `--interface`: Specifies the network interface.
    - `--as`: Defines the EIGRP AS number.
    - `--src`: Sets the IP Address of a legitimate router.

## **Routing Table Overflow Attack**

- **Objective**: To strain the router's CPU and RAM by flooding the routing table with numerous false routes.
- **Tool**: **routingtableoverflow.py** script.
- **Execution**:
    %%%bash
    sudo python3 routingtableoverflow.py --interface eth0 --as 1 --src 10.10.100.50
    %%%
- **Parameters**:
    - `--interface`: Specifies the network interface.
    - `--as`: Defines the EIGRP AS number.
    - `--src`: Sets the attacker’s IP address.


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