---------- Forwarded message --------- From: Timothée Ravier siosm@fedoraproject.org Date: Wed, 10 Apr 2024 at 14:52 Subject: CVE-2024-2905: World-readable /etc/shadow & /etc/gshadow on Fedora CoreOS, IoT, Atomic Desktops To: devel@lists.fedoraproject.org

Due to a bug in rpm-ostree, the /etc/shadow, /etc/shadow-, /etc/gshadow and /etc/gshadow- files in Fedora CoreOS, IoT, Atomic Desktops have the world-readable bit set.

== Affected versions ==

All Fedora CoreOS nodes installed starting from the following versions are impacted: - stable: 38.20230902.3.0 - testing: 38.20230902.2.1 - next: 38.20230902.1.1

Fedora IoT and Fedora Atomic Desktops (Silverblue, Kinoite, Sway Atomic, Budgie Atomic) systems that were installed from Fedora 39 and later release media and ISOs are affected.

This only impacts new installations and not updated systems thus systems installed from artifacts before those releases are not impacted (Fedora 38 or earlier).

This only impacts systems where a password is set. Systems where only SSH keys were used are not impacted by this vulnerability even though it is present on the node.

On systems with SELinux enabled and in enforcing mode, access to those files is limited to unconfined (usually interactive) users, unconfined systemd services and privileged containers. Confined daemons, users and containers are not able to access them.

== Fixed versions ==

The following Fedora CoreOS versions fix the issue and include a systemd unit to fix existing systems on update: - stable: 39.20240322.3.1 - testing: 39.20240407.2.0 - next: 40.20240408.1.0

Fedora CoreOS systems with automatic updates enabled will automatically get the update starting on 2024-04-10 14:00 UTC.

Fedora Atomic Desktops version 39.20240410.1 includes the fix. The fix is still pending for Fedora Atomic Desktops 40 (not officially released yet).

An update with the fix for Fedora IoT is still pending.

== Workaround / immediate fix ==

To immediately fix existing systems, you can run the following command as root:

chmod --verbose 0000 /etc/shadow /etc/gshadow /etc/shadow- /etc/gshadow-

As a precaution, we recommend rotating all user credentials stored in those files.

== References ==

GitHub Security Advisory: https://github.com/coreos/rpm-ostree/security/advisories/GHSA-2m76-cwhg-7wv6 Red Hat Security Advisory: https://access.redhat.com/security/cve/CVE-2024-2905 Fedora CoreOS issue: https://github.com/coreos/fedora-coreos-tracker/issues/1705 -- _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-leave@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue