From nobody Wed Feb 14 07:07:11 2024 X-Original-To: freebsd-security-notifications@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 4TZTlg3F4zz5BBvN for ; Wed, 14 Feb 2024 07:07:11 +0000 (UTC) (envelope-from security-advisories@freebsd.org) Received: from freefall.freebsd.org (freefall.freebsd.org [96.47.72.132]) (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 4TZTlg2KgJz4cZd; 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=lKeUrY1/y3kZ2+gcuVMiU4cskNdogJA3SsbegbHeEDjmVrosSDL8BUFtEOVjBqC+pmFomY mmSZHBm7qLYPmWg9qrEP+HHsgcQuvt/5qY1DQNyeFXmZxPcCmdaKxfjkWHG/DVZs/2QW3l gtdWQN+issIs3hkJ/qJpiKtNsrFhuMycCEscjl8MKXB/pE7mLWZE4C6OdXXjywC0A6MHpJ 4E0w843EHcO5PiY/fHYk4WMxZ4d8e+dq6sKz7ND6cjv5JaY8/H+cwSrYfgOuu9a+xPB/Dz QrIpWusNPDCSKSIxwjg7qh8ZwEbiO+YTCWhVyeiMNzwpneo/9LlUuDLXVid4jg== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1707894431; a=rsa-sha256; cv=none; b=H9aSQz1Fe2wOJmfTJ/CP7Cr5UzSJqNHM2chhWhtnG+XCp4afD7Nw8IaRheU17tvKVj6Z3X Digfjtx0vwzi4vgyoKctCn1UKkPQNgpCHnt9Rln68kn6pHbfBspgb1gw6vq+NlLI6Qsg1o 4dR5nBMGCZsZ8xvePC+2RhHUdErO05sheWjzB690oTMvvucN7HrQSLXDc3Xy/Tn2qRmuzG 5b5J+b0wsrQNhj0EgSomK64qBzF1wQpiB31ndzTDFxLKq62PIhLjoamMka9gb8ql6ljG4J Kkn/J5JFUMVTI51x/PInby5bzHAkcUjCsSMaPGgbFyaiRicGWosOLq+actjahQ== 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=IL2tsVYc2fPyiVi6vP3jlozyg8vh6/CyD5X4MqXWbNSh7RF+A+4yzO/cjwYi9HAfVFAogd olVX3GV7/HN3mbKUrooqqlVLXy7+ZYLoBV3GbCc3Ox5n/SXzx0lflPSTfY2PN0TmccN0KC TZargsKc9jNiQ5PLzGa2cg6SdbdFCxdM1wuE55hHF44wrp6aMtel4ruQxEj8xs5rvJb286 Xr324mUldNezoWkb2oFRywlYVoNnSmdJnoWBppUZBEj4fL8orIB/a3xNQdlOUF9L7mNOP8 xhfQEaYr9M1SaPKWXBmYFXOXt9sZgGkRQKWCi68KFC/swHj97kk0h35OOtRyhQ== Received: by freefall.freebsd.org (Postfix, from userid 945) id 3C93C267C2; 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: <20240214070711.3C93C267C2@freefall.freebsd.org> Date: Wed, 14 Feb 2024 07:07:11 +0000 (UTC) List-Id: Moderated Security Notifications [moderated, low volume] List-Archive: https://lists.freebsd.org/archives/freebsd-security-notifications List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-security-notifications@freebsd.org X-BeenThere: freebsd-security-notifications@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-----