From nobody Wed Feb 14 07:07:11 2024 X-Original-To: freebsd-security@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4TZTlg3B1fz5BBhB for ; Wed, 14 Feb 2024 07:07:11 +0000 (UTC) (envelope-from security-advisories@freebsd.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2610:1c1:1:6074::16:84]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "freefall.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4TZTlg2H4Nz4d0d; Wed, 14 Feb 2024 07:07:11 +0000 (UTC) (envelope-from security-advisories@freebsd.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1707894431; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc; bh=c2Z67PDdAwFf8XcNdhnUJFAj4JFEPYcSo61NJi4CKP0=; b=qxgxVuvM2dqbmyZTB8TWXkwRjZ1a/WGhJiAC7cT7yDBND9rb0W4lIruhPtnz1vGDMGZkm+ XH9DBzz+FhYNmMr3wIf7Cy89RzLtosmg2y4TqGZKAqkgzIq7ocbOLGmsjuR7CIdoz3Pv4j +PpbMb/TCxFewzvI4PRmMFQkHrS/6lRQELbUlGxustBpOci272gi4I6iocJGfprbGqORoc xYE1Iia7yXyRXMAlZn645jHRWEbu9azts5hbevQFjFWOffORKaPFNOXcQY9RuXTtMyVlRS OxNXiBnWF02z/sN9yYsvjNzx+H0gl6WmkoKH30VtMju0EvRGqKdS8QdoNmacDw== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1707894431; a=rsa-sha256; cv=none; b=Osw9Hr6t6PTXNKds0HXlWBlQBXXahaS2CQkAUohCbTjlXqI5StghQXdL/tgC9tqmKBvH+z PdJIWerepvlwpvSyLnq/SerWhhGTaFp+YE96dAKnC8mSNf6pRLI1ldAuNbjQgnUmGkP+cB +fhKiUjx1D/h3FUR8Be5F6SY5iLvkIEZAD3UFh197E3Y+kYwhowF4hkDagiajhU/KkwBnn ixva9n9x8JMPjnU4K+zkc51/inaMB7wRiXDgpMrul7AeJEGfQjRO5A8kq1yu2+uPfAgQ5Z Rnv9rqK7UH1NkRGFP81qMQF6ml5o/mBGHtSP2nHhwLazUFFOmSLqFFAXhCOkHQ== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1707894431; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc; bh=c2Z67PDdAwFf8XcNdhnUJFAj4JFEPYcSo61NJi4CKP0=; b=NfjHfa+RLonCSWt99+6o7CORHkv0OmD0I/Io1Ih5Tj5ckDVtdKMjnNeZtRvCyep0zHXfj5 43kbo/QVVldfMaa7vPbHM2tMF8+REigz/ydZlKsyWiyuZ1Z+/21eAMlGyP8aLom/WvGImt SH97mzDtb6lOlziofYEDX4fpKOqxfHoCW7JXzm/dtWfPtFW7KnOl85gwRzTHymBCMJOq8G /lTDebf15ViOOJ5/qoOyDaQZH3V3x0CmrdVducKDplrmj7Zh+eqUN+c2vIJanb3luAJXsB WMMYYriH7R4/oo6N1nIT8D6lD8ISWbX8mjUSsG/0rOIbg3XcXhcKdKokHXEXpg== Received: by freefall.freebsd.org (Postfix, from userid 945) id 34F1B26677; Wed, 14 Feb 2024 07:07:11 +0000 (UTC) From: FreeBSD Security Advisories To: FreeBSD Security Advisories Subject: FreeBSD Security Advisory FreeBSD-SA-24:02.tty Reply-To: freebsd-security@freebsd.org Precedence: bulk Message-Id: <20240214070711.34F1B26677@freefall.freebsd.org> Date: Wed, 14 Feb 2024 07:07:11 +0000 (UTC) List-Id: Security issues List-Archive: https://lists.freebsd.org/archives/freebsd-security List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-security@freebsd.org X-BeenThere: freebsd-security@freebsd.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-24:02.tty Security Advisory The FreeBSD Project Topic: jail(2) information leak Category: core Module: jail Announced: 2024-02-14 Credits: Pawel Jakub Dawidek Affects: All supported versions of FreeBSD. Corrected: 2024-02-12 16:25:54 UTC (stable/14, 14.0-STABLE) 2024-02-14 06:05:46 UTC (releng/14.0, 14.0-RELEASE-p5) 2024-02-12 16:27:37 UTC (stable/13, 13.2-STABLE) 2024-02-14 06:06:01 UTC (releng/13.2, 13.2-RELEASE-p10) CVE Name: CVE-2024-25941 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background The jail(2) system call allows a system administrator to lock a process and all of its descendants inside an environment with a very limited ability to affect the system outside that environment, even for processes with superuser privileges. It is an extension of, but far more powerful than, the traditional UNIX chroot(2) system call. tty(4) is a general terminal device. II. Problem Description The jail(2) system call has not limited a visiblity of allocated TTYs (the kern.ttys sysctl). This gives rise to an information leak about processes outside the current jail. III. Impact Attacker can get information about TTYs allocated on the host or in other jails. Effectively, the information printed by "pstat -t" may be leaked. IV. Workaround No workaround is available. V. Solution Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date and reboot. Perform one of the following: 1) To update your vulnerable system via a binary patch: Systems running a RELEASE version of FreeBSD on the amd64 or arm64 platforms, or the i386 platform on FreeBSD 13, can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install # shutdown -r +10min "Rebooting for a security update" 2) To update your vulnerable system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch https://security.FreeBSD.org/patches/SA-24:02/tty.patch # fetch https://security.FreeBSD.org/patches/SA-24:02/tty.patch.asc # gpg --verify tty.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile your kernel as described in and reboot the system. VI. Correction details This issue is corrected as of the corresponding Git commit hash in the following stable and release branches: Branch/path Hash Revision - ------------------------------------------------------------------------- stable/14/ 215bb03edc54 stable/14-n266676 releng/14.0/ 4d354159d150 releng/14.0-n265407 stable/13/ 9bff7ec98354 stable/13-n257418 releng/13.2/ 17257e6e9a23 releng/13.2-n254658 - ------------------------------------------------------------------------- Run the following command to see which files were modified by a particular commit: # git show --stat Or visit the following URL, replacing NNNNNN with the hash: To determine the commit count in a working tree (for comparison against nNNNNNN in the table above), run: # git rev-list --count --first-parent HEAD VII. References The latest revision of this advisory is available at -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEthUnfoEIffdcgYM7bljekB8AGu8FAmXMYRMACgkQbljekB8A Gu8C7hAAxXasfu+Xn3+voOk5pJvFJd6jWA1ZCvR83YnIqAGibiWvNaMdsdfe4k6x eEoaQ6maYYu/wjXMZ0HbapTuJPRxwrcG7i2mZ52vSm9glSZO87Lw3oWVIV7eRPpN pFJtR5bUXns1/dWQgcgFMc/4nNk7NO6gamuK/uwfrDF0aQsYif5pX5DmhkOD/CnQ CjPWhv6FT94qzUiQrZLSWjCIe/rhNbmbLkhyck4MZP+1aILxsb+BHSaEeBzej2+S 8WisLPKlTwNgpA+DN+sLn28gR1+0Vd5rAv7gvcbWHE3VNvq0ABTwRoZFA4SzHEhL BNkwMJnMJyR7qj1jWCmfrHptIPpSXtNIvh70yts5/+9nPBDkAYV9U+nJYQTZ40+U Mn1OfN4ioRfB7bOjVA4J6Ncws4M2ttcOEyk+d8Egd5/7njOGC1sqX0F4FXAtioZF JATTBd09J9TTZvX5xz6JdK8ZHKc+xtxYiBYg4WQTyVcPg38ONpYarSIQ6XYnNSyP 0Cv1ih5DpxzdEBA+Pu4+dJmZSlyNOJXpmlPKgyiUX0Z085ZqHTMvAXQQS/M7MXai 06d2YnZx4XfGoAhCXZKyvE6J6btiy+t8QNx14tEdtD/ktzAmB3EYHOuuPEFoS44Y 8tafKE9ps5AgWtqXvK7H5NKMwtb9Ry60WSAFfgn0LoFmw8UyBjg= =HQVb -----END PGP SIGNATURE-----