How to Prevent Symlink Attacks

ad Impact of Symlink - Suppose you own a small hosting company with a Linux Box, & 1337 sites are hosted there. If an attacker gains access to any single site on your server, he can easily create a symbolic link to / directory & then putting the document root afterwards it. Now the attacker can easily read sensitive files, that can be the configuration file of your billing system. Since, he has local access, now he can easily connect to the mysql & pwn all your clients, & the whole company.

How Symlink is Created - A basic linux command is used in creating symlink. i.e,

ln -s source_file link_name



                                     :: 0x02 Protecting ::

Patching Symlink-

1.Change the permission of /bin/ln to 400.

2.Locate php.ini by command- "Locate php.ini” (without quotes) Edit the main php.ini & disable  symlink & proc_open.

3.If you have a shared host, & it is vulnerable to symlink.Then, change the permission of your configuration files to 400. 

4.    Turn PHP safe_mode ON


php.ini-

Was this answer helpful?

 Print this Article

Also Read

what is eXploit Scanner (cxs)

eXploit Scanner (cxs) is a new tool from Configserver that performs active scanning of files as...

How to disable all Apache header information?

Follow the below steps to disable Apache header information. Edit your mail Apache configuration...

25 Most Frequently Used Linux IPTables Rules Examples

In the below examples we are using ETH0 as network interface, however if you are using our...

WHM/cPanel Server Hardening And Security Basics

1. Introduction A step by step paper how to secure linux server with cPanel/WHM andApache...

How to install mod_security on Apache 2.x

What is mod_security or modsecurity? ModSecurity is an open source intrusion detection and...