With the expansion of Linux enterprise applications, there are a large number of Web servers using the Linux operating system. Linux server's security features are more and more attention. Attack on the Linux server is defined as: attack is a device intended to obstruct, damage, weaken, and undermine the security of Linux serverís unauthorized behavior. Attacks can range from denial of service until they are completely the harm and destruction of Linux servers. On Linux there are many types of server attacks so I need to know the information related to the vulnerabilities of Linux server.