#37744 - Insecure permissions on /var/guix/profiles/per-user (CVE-2019-18192)

Package	Source(s)		Maintainer(s)
guix		PTS Buildd Popcon

Message #66 received at 37744@debbugs.gnu.org (full text, mbox, reply):

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From: Tobias Geerinckx-Rice <me@tobias.gr>
To: Ludovic Courtès <ludo@gnu.org>
Subject: Re: bug#37744: Per-user profile directory hijack (CVE-2019-17365 for
 Nix)
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Date: Wed, 16 Oct 2019 21:55:12 +0200
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[Message part 1 (text/plain, inline)]

Let's try that again:

[N (text/plain, inline)]

       (nl "Onveilige @file{/var/guix/profiles/per-user}-rechten"))
	 (nl "Het standaard gebruikersprofiel, @file{~/.guix-profile}, verwijst
naar @file{/var/guix/profiles/per-user/$USER}.  Tot op heden kon om het even wie
in @file{/var/guix/profiles/per-user} schrijven, wat het @command{guix}-commando
toestond de @code{$USER} submap aan te maken.

Op systemen met meerdere gebuikers kon hierdoor een kwaadaardige gebruiker een
@code{$USER} submap met inhoud aanmaken voor een andere gebruiker die nog niet
was ingelogd.  Omdat @code{/var/@dots{}/$USER} zich in @code{$PATH} bevindt,
kon het doelwit zo code uitvoeren die door de aanvaller zelf werd aangeleverd.
Zie @uref{https://issues.guix.gnu.org/issue/37744} voor meer informatie.

Dit probleem is nu verholpen: schrijven door iedereen in @code{per-user} is niet
meer toegestaan en @command{guix-daemon} maakt zelf submappen aan namens de
gebruiker.  Op systemen met meerdere gebruikers raden we aan om
@code{guix-daemon} nu bij te werken.  Op Guix System kan dit met
@code{guix pull && sudo guix system reconfigure @dots{}}, op andere distributies
met @code{sudo guix pull}.  Herstart vervolgens in beide gevallen
@code{guix-daemon} met @code{herd} of @code{systemctl}.")

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#37744 Insecure permissions on /var/guix/profiles/per-user (CVE-2019-18192)