./

[Derek Martin]

On Tue, Nov 11, 2003 at 03:09:21AM +0000, dsr at tao.merseine.nu wrote:
> Let's add another safety tip: don't add . to $PATH for normal users,
> but do add ~/bin, and use the /etc/rc.skel or equivalent to create
> ~/bin for all new users. When people want to add special commands,
> putting them in their local bin is The Right Thing To Do.

That SEEMS like a good idea, but it's actually worse than having '.'
in the user's path.  Why?  Because the user can almost certainly write
files to ~/bin.  This means that, say, someone exploiting a hole in
Mozilla could make your browser write their malicious script into
~/bin and make it executable.  Now you have a much more likely attack
vector, since that directory is also in the user's PATH.  Bad bad bad.

Red Hat used to set ~/bin up, by default.  They don't anymore.  :)

Never put user-writable directories in the PATH.  If you're going to
ignore that, and/or put '.' in the PATH, be sure to at least put them
in LAST.

-- 
Derek D. Martin
http://www.pizzashack.org/
GPG Key ID: 0xDFBEAD02
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