This comment is from
http://meta.wikimedia.org/wiki/My_MediaWiki_Site_was_hacked._How%3F_What
_should_I_do%3F:
"Here's another problem: It seems that a number of users are leaving the
/images directory set at 777 - globally writable. This permits malicious
users to take advantage of this and overwriting existing images with
their own spiteful images. It should be noted that this is not a
MediaWiki issue so much as it is a general permissions issue."
My question is: What is the recommended minimum permission setting?
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