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news: Add entry for security issue with /var/guix/profiles/per-user.

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* etc/news.scm: Add entry for security issue in multi-user setups.
This commit is contained in:
Ludovic Courtès 2019-10-16 12:16:20 +02:00
parent 81c580c866
commit 5d800cb931
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1 changed files with 22 additions and 0 deletions
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etc/news.scm
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@ -9,6 +9,28 @@
(channel-news (channel-news
(version 0) (version 0)
(entry (commit "81c580c8664bfeeb767e2c47ea343004e88223c7")
(title (en "Insecure @file{/var/guix/profiles/per-user} permissions"))
(body
(en "The default user profile, @file{~/.guix-profile}, points to
@file{/var/guix/profiles/per-user/$USER}. Until now,
@file{/var/guix/profiles/per-user} was world-writable, allowing the
@command{guix} command to create the @code{$USER} sub-directory.
On a multi-user system, this allowed a malicious user to create and populate
that @code{$USER} sub-directory for another user that had not yet logged in.
Since @code{/var/@dots{}/$USER} is in @code{$PATH}, the target user could end
up running attacker-provided code. See
@uref{https://issues.guix.gnu.org/issue/37744} for more information.
This is now fixed by letting @command{guix-daemon} create these directories on
behalf of users and removing the world-writable permissions on
@code{per-user}. On multi-user systems, we recommend updating the daemon now.
To do that, run @code{sudo guix pull} if you're on a foreign distro, or run
@code{guix pull && sudo guix system reconfigure @dots{}} on Guix System. In
both cases, make sure to restart the service afterwards, with @code{herd} or
@code{systemctl}.")))
(entry (commit "5f3f70391809f8791c55c05bd1646bc58508fa2c") (entry (commit "5f3f70391809f8791c55c05bd1646bc58508fa2c")
(title (en "GNU C Library upgraded") (title (en "GNU C Library upgraded")
(de "GNU-C-Bibliothek aktualisiert") (de "GNU-C-Bibliothek aktualisiert")