Re: Why is "local" insecure PATH element ?

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On Wed, Apr 01, 2020 at 11:26:04AM -0700, Samuel Sieb wrote:
> On 4/1/20 4:27 AM, Lukas Czerner wrote:
> > I've noticed some failures in automated tests in bodhi, specifically
> > this one:
> > 
> >      {
> >         "arch" : "x86_64",
> >         "code" : "SuspiciousPath",
> >         "context" : {
> > 	  "excerpt" : [
> > 	     "PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin"
> > 	  ],
> > 	  "path" : "/usr/sbin/e2scrub"
> >         },
> >         "diag" : "Potentially insecure PATH element <tt>/local</tt>",
> >         "subpackage" : "e2scrub"
> >      },
> > 
> > I am not sure why it's considered insecure while on all of the Fedora
> > and RHEL systems I have available "/usr/local/sbin:/usr/local/bin" is a
> > default part of the PATH.
> 
> You don't want a system script to be looking for executables in /usr/local
> before the regular bin directories.  And it's probably better that it
> doesn't look in /usr/local at all.
> It's fine for the admin to put extra things in /usr/local, but those paths
> don't override the system ones.

Thanks, that's understandable, but then why the PATH on my system is

/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin

or

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin

all the systems I try include /usr/local in the PATH.

-Lukas

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