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Message-ID: <20120507084051.GB2675@sivokote.iziade.m$> Date: Mon, 7 May 2012 11:40:51 +0300 From: Georgi Guninski <guninski@...inski.com> To: Marc Deslauriers <marc.deslauriers@...onical.com> Cc: Full Disclosure <full-disclosure@...ts.grok.org.uk> Subject: Re: Ubuntu, Linux Mint, and the Guest Account On Sat, May 05, 2012 at 07:52:25PM -0400, Marc Deslauriers wrote: > On Sat, 2012-05-05 at 19:42 -0400, Jeffrey Walton wrote: > > I know there's not much new here, but I am amazed that Ubuntu, Linux > > Mint and friends ship with a Guest account present and enabled. > > > > The Guest account is surreptitiously added through a lightdm > > configuration file, and is not part of the standard user database. > > Because its not part of the standard user database, it can't be > > disabled through /etc/shadow, nor disable it through familiar tools > > such as userdel and usermod. Additionally, the damn account does not > > show up in distribution provided tools such as User Accounts applet. > > > > To make matters worse, grepping for guest returns 0 results because > > lightdm.conf does not mention one must add the following to disable > > the guest account (nothing is required to enable the account): > > > > allow-guest=false > > > > To add insult to injury, the Guest account is not sandboxed and user > > home directories lack sufficient ACLs, so the guest account is able to > > wander through user's home directories: > > The guest account should be confined with an AppArmor profile on Ubuntu, > which prevents it from accessing other users' directories. Please file a > bug if this isn't working correctly for you. > > Marc. > i doubt AppArmor stops all root exploits, though i don't care about your nonsense much -- Georgi _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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