Zabbix Threat Control - Zabbix Vulnerability Assessment Plugin

This plugin transforms your Zabbix monitoring system into vulnerability, risk and security managment system for your infrastructure.

What the plugin does
It provides Zabbix with information about vulnerabilities existing in your entire infrastructure and suggests easily applicable remediation plans.

Information is displayed in Zabbix in the following format:

• Maximum CVSS score for each server.
• Command for fixing all detected vulnerabilities for each server.
• List of security bulletins with descriptions for vulnerable packages valid for your infrastructure.
• List of all vulnerable packages in your infrastructure.

Security bulletins and packages information includes:

• Impact index for the infrastructure.
• CVSS score of a package or a bulletin.
• Number of affected servers.
• A detailed list of affected hosts.
• Hyperlink to the description of a bulletin.

Sometimes it is impossible to update all packages on all servers to a version that fixes existing vulnerabilities. The proposed representation permits you to selectively update servers or packages.
This approach allows one to fix vulnerabilities using different strategies:

• all vulnerabilities on a specific server;
• a single vulnerability in the entire infrastructure.

This can be done directly from Zabbix (using its standard functionality) either on the administrator command or automatically.

How the plugin works

• Using Zabbix API, the plugin receives lists of installed packages, names and versions of the OS from all the servers in the infrastructure (if the "Vulners OS-Report" template is linked with them).
• Transmits the data to Vulners
• Receives information on the vulnerabilities for each server.
• Processes the received information, aggregates it and sends it back to Zabbix via zabbix-sender.
• Finally the result is displayed in Zabbix.

Requirements
On zabbix-server host:

• python 3 (only for ztc scripts)
• python modules: pyzabbix, jpath, requests
• zabbix version 3.4 is required to create a custom dashboard and a custom polling schedule.
• zabbix-sender utility for sending data to zabbix-server.
• zabbix-get utility for sending a command to fix vulnerabilities on the server.

On all the servers that require a vulnerability scan:

• zabbix-agent for collect data and run scripts.

Installation

RHEL, CentOS and other RPM-based

rpm -Uhv https://repo.vulners.com/redhat/vulners-repo.rpm

On zabbix-server host:

yum install zabbix-threat-control-main zabbix-threat-control-host

On all the servers that require a vulnerability scan:

yum install zabbix-threat-control-host

Debian and other debian-based

wget https://repo.vulners.com/debian/vulners-repo.deb
dpkg -i vulners-repo.deb

On zabbix-server host:

apt-get update && apt-get install zabbix-threat-control-main zabbix-threat-control-host

On all the servers that require a vulnerability scan:

apt-get update && apt-get install zabbix-threat-control-host

From source
On zabbix-server host:

git clone https://github.com/vulnersCom/zabbix-threat-control.git
mkdir -p /opt/monitoring/zabbix-threat-control
cp zabbix-threat-control/*.py /opt/monitoring/zabbix-threat-control/
cp zabbix-threat-control/*.conf /opt/monitoring/zabbix-threat-control/
chown -R zabbix:zabbix /opt/monitoring/zabbix-threat-control
chmod 640 /opt/monitoring/zabbix-threat-control/*.conf
touch /var/log/zabbix-threat-control.log
chown zabbix:zabbix /var/log/zabbix-threat-control.log
chmod 664 /var/log/zabbix-threat-control.log

On all the servers that require a vulnerability scan:

git clone https://github.com/vulnersCom/zabbix-threat-control.git
mkdir -p /opt/monitoring/
cp -R zabbix-threat-control/os-report /opt/monitoring/
chown -R zabbix:zabbix /opt/monitoring/os-report

Configuration
Configuration file is located here: /opt/monitoring/zabbix-threat-control/ztc.conf

Vulners credentials
To use Vulners API you need an api-key. To get it follow the steps bellow:

• Log in to vulners.com.
• Navigate to userinfo space https://vulners.com/userinfo.
• Choose "API KEYS" section.
• Select "scan" in scope menu and click "Generate new key".
• You will get an api-key, which looks like this: RGB9YPJG7CFAXP35PMDVYFFJPGZ9ZIRO1VGO9K9269B0K86K6XQQQR32O6007NUK

Now you need to add the Vulners api-key into your configuration file (parameter VulnersApiKey).

VulnersApiKey = RGB9YPJG7CFAXP35PMDVYFFJPGZ9ZIRO1VGO9K9269B0K86K6XQQQR32O6007NUK

Zabbix credentials
In order to connect to Zabbix you need to specify the following in the configuration file:

• The URL, username and password. Note that the User should have rights to create groups, hosts and templates in Zabbix.
• Domain name and port of the Zabbix-server for pushing data using the zabbix-sender.

Here is an example of a valid config file:

ZabbixApiUser = yourlogin
ZabbixApiPassword = yourpassword
ZabbixFrontUrl = https://zabbixfront.yourdomain.com

ZabbixServerFQDN = zabbixserver.yourdomain.com
ZabbixServerPort = 10051

Zabbix entity

1. To create all the necessary objects in Zabbix, run the prepare.py script with parameters.
   /opt/monitoring/zabbix-threat-control/prepare.py -uvtda
   It will verify that the zabbix-agent and zabbix-get utilities are configured correctly and create the following objects using Zabbix API:
   • A template used to collect data from servers.
   • Zabbix hosts for obtaining data on vulnerabilities.
   • An action for run the command fixes the vulnerability.
   • A dashboard for displaying results.
2. Using the Zabbix web interface, it is necessary to link the "Vulners OS-Report" template with the hosts that you are doing a vulnerabilities scan on.

Servers that require a vulnerability scan
Zabbix-agent must be able to execute remote commands. To do this, change the parameters in the zabbix-agent configuration file /etc/zabbix/zabbix_agentd.conf:

EnableRemoteCommands=1
LogRemoteCommands=1

Zabbix-agent must be able to update packages as root. To do this, add a line to the file /etc/sudoers:

zabbix ALL=(ALL) NOPASSWD: /usr/bin/yum -y update *
zabbix ALL=(ALL) NOPASSWD: /usr/bin/apt-get --assume-yes install --only-upgrade *

Execution

• /opt/monitoring/os-report/report.py
  Script transfers the name, version and installed packages of the operating system to Zabbix.
  Runs with zabbix-agent on all hosts to which the template "Vulners OS-Report" is linked.
  
• /opt/monitoring/zabbix-threat-control/scan.py
  Script processes raw data from zabbix and vulners and push them to the monitoring system using zabbix-sender.
  Runs with zabbix-agent on the Zabbix server via the item "Service item" on the host "Vulners - Statistics".
  

These 2 scripts above are run once a day. The start-up time is selected randomly during the installation and does not change during operation.

• /opt/monitoring/zabbix-threat-control/fix.py
  Script runs commands to fix vulnerabilities on servers. Executed as a remote command in the action "Vunlers" in Zabbix.