full-disclosure - ftpd chdir() while root

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Message-Id: <200608250107.k7P17HqM003718@asti.maths.usyd.edu.au>
Date: Fri, 25 Aug 2006 11:07:17 +1000
From: Paul Szabo <psz@...hs.usyd.edu.au>
To: full-disclosure@...ts.grok.org.uk
Subject: ftpd chdir() while root

Seems to me that ftpd does chdir(homedir) while root, before setting
UID/GID to the user logging in. This creates difficulties if the home
directory is on another machine via NFS with root_squash, and I guess
is a security issue as in some cases you may get a current directory
that would otherwise be inaccessible.

Some more details in  http://bugs.debian.org/384454 .

Cheers,

Paul Szabo   psz@...hs.usyd.edu.au   http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics   University of Sydney    Australia

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