Category: Security

How to find php script that sends mail from your linux system

We run into a problem where customers Linux vm was sending a lot of unwanted messages. In order to troubleshoot this problem we did 2 things. Instructions below are for CentOS 6 and 7 but will also work on other distributions with minor configuration changes. Option 1

Running OSSEC client on web server

OSSEC is amazing tool and helps you be more secure by notifying you of any potential problems. However when it comes to monitoring web servers some additional configuration is necessary to get it working properly. In this quick write up we will look into making changes to default configuration when OSSEC running on web server.

Installing OSSEC 2.8.3 on CentOS 7 Client Server mode

In this how to we will be installing OSSEC Host based intrusion detection system on CentOS 7. We will be using clinet/server deployment which is recomended way to deploy OSSEC on the network where more then one system will be monitored.

Secure OpenSSH with Key based authentication and TCP Wrappers

SSH-Secure Shell was created to provide secure mechanism for data transfer between source and destination hosts on IP based network. SSH uses encryption techniques and digital signatures data checking to ensure security of data being transferred. OpenSSH is free and open source. It also supports additional features like tunnelling, TCP port forwarding and X11 forwarding.