full-disclosure - ftpd chdir() while root

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

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

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/