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As an Ubuntu user, any tips on how Linux.Darlloz could affect Ubuntu and ways to prevent it?

Seth
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If you don't have PHP-cgi installed or if you upgrade it recently. Nothing.

Linux.Darlloz is a worm that spreads to vulnerable systems by exploiting the PHP 'php-cgi'.

Ubuntu already release fixes to prevent spread more than a year ago:

Braiam
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    only server that have webserver + php (with php-cgi installed) running, will be affected. this does not affect he normal Linux client machine if they dont have webserver and php-cgi in use, or have php-cgi installed,but no webserver. – Peter Teoh Jan 15 '14 at 04:51