Jason S. on Fri, 3 Sep 1999 10:42:08 -0400 (EDT)


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Re: [Plug] RE: Path


Well, thats why you dont have "." in your path. Altho full paths are
always a good habit.

J.

When I grow up, I wanna be more like me.
I had a clue. I didn't like it. I took it back and exchanged it for an
attitude.  

On Fri, 3 Sep 1999, Hugh Brock wrote:

> In general, if I'm not mistaken, you don't want much in the search path
> for the superuser, if for no other reason than that you want to get in
> the habit of typing the full path for every command you run as root
> (e.g. "/bin/ls", not just "ls").
> 
> Why? If an attacker was able to gain normal-user status on your system,
> she could plant a trojan-horse "ls" (for example) in the compromised
> user's home directory that emails /etc/passwd to an address in Botswana,
> or something worse. Then when you go to that directory as root and type
> "ls", which you will probably do at some point, the trojan horse ls gets
> executed with root privileges. If, on the other hand, you type /bin/ls,
> nothing happens other than that you wonder "hey, what's this 'ls' doing
> in joe user's home directory?"
> 
> (See 'Practical Unix and Internet Security' for more... best $40 I ever
> spent...)
> 
> --Hugh
> 
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