"Unix Manual" PHP-Script allows arbitrary code execution

"Unix Manual" is an PHP-Script by "Marcus S. xenakis", which allows users to
view the Unix man-Pages via Browser.
As a User, all you have to do is visit a Page using this script with a
Browser, and entering the Unix-Command in a textbox.
After clicking "Submit" the Page reloads and shows you the specified
man-Page.

Vulnerable Versions:
I did not check very many of them yet (if there exist several versions), but
every version I found was vulnerable to this bug.

Bug:
It seems like the Script pipes the request directly to the shell without
checking for unsecure characters like ";" and so on.

Example:
-Go to a Page using this script (for Example:
http://www.newbiehacker.uk.co/manual.php).
-Enter in the textbox: "; ls -l" (without the "").

Result:
"Unix Manual" shows you the contents of the directory in which the script is
located.

Impact:
By using this bug it is possible for an attacker to execute every
Unix-command he wants with HTTP-Daemon-Rights.

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