According to Denis, the Linux servers can be infected to be used in a
botnet used to distribute malware
For more... http://www.ezdia.com/Can_Linux_servers_Infected_%253F/Content.do?id=691
Morons always try to ride on the coattails of others while trying to
appear as if they were capable of doing anything on their own. The
original information this statement is based on is available here:
http://blog.unmaskparasites.com/2009/09/11/dynamic-dns-and-botnet-of-zombie-web-servers
And it deals with 'somehow hacked' web servers. Somewhat more details
are available here:
It is conjectured that access to the servers was gained by stealing
root-credential for FTP access from 'spyware infected administrator
desktop machines', in short 'Windows computers operated by relatively
careless people'.