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

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

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From: Ludovic Courtès <ludo@gnu.org>
To: Tobias Geerinckx-Rice <me@tobias.gr>
Subject: Re: bug#37744: Per-user profile directory hijack (CVE-2019-17365 for
 Nix)
References: <87o8yjsr8o.fsf@gnu.org> <87blujsqq0.fsf@gnu.org>
 <87y2xno85o.fsf@nckx> <87d0eyuqzd.fsf@gnu.org> <87mue2nkrj.fsf@nckx>
Date: Wed, 16 Oct 2019 08:57:05 +0200
In-Reply-To: <87mue2nkrj.fsf@nckx> (Tobias Geerinckx-Rice's message of "Tue,
 15 Oct 2019 16:31:40 +0200")
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Hi Tobias,

Tobias Geerinckx-Rice <me@tobias.gr> skribis:

> No, I ask it nicely: ‘hullo daemon, I'm, er, "ludo"’.
>
> Of course the remote daemon doesn't trust me beyond pre-creating an
> empty per-user directory owned by the local "ludo" user only if such a
> user exists.  It doesn't even report succes or failure to avoid
> leaking valid user names.

Ah you’re right, the worst that can happen is that an empty directory is
created for someone else.  Sounds like a plan.

Ludo’.

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