From owner-freebsd-security-notifications@FreeBSD.ORG Fri May 6 03:03:23 2005 Return-Path: Delivered-To: freebsd-security-notifications@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id BFC2B16A5DE; Fri, 6 May 2005 03:03:23 +0000 (GMT) Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7D66643D8E; Fri, 6 May 2005 03:03:23 +0000 (GMT) (envelope-from security-advisories@freebsd.org) Received: from freefall.freebsd.org (cperciva@localhost [127.0.0.1]) by freefall.freebsd.org (8.13.3/8.13.3) with ESMTP id j4633N0B089171; Fri, 6 May 2005 03:03:23 GMT (envelope-from security-advisories@freebsd.org) Received: (from cperciva@localhost) by freefall.freebsd.org (8.13.3/8.13.1/Submit) id j4633NvP089169; Fri, 6 May 2005 03:03:23 GMT (envelope-from security-advisories@freebsd.org) Date: Fri, 6 May 2005 03:03:23 GMT Message-Id: <200505060303.j4633NvP089169@freefall.freebsd.org> X-Authentication-Warning: freefall.freebsd.org: cperciva set sender to security-advisories@freebsd.org using -f From: FreeBSD Security Advisories To: FreeBSD Security Advisories Precedence: bulk Subject: FreeBSD Security Advisory FreeBSD-SA-05:08.kmem X-BeenThere: freebsd-security-notifications@freebsd.org X-Mailman-Version: 2.1.1 Reply-To: security-advisories@freebsd.org List-Id: Moderated Security Notifications [moderated, low volume] List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 May 2005 03:03:24 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-05:08.kmem Security Advisory The FreeBSD Project Topic: Local kernel memory disclosure Category: core Module: sys Announced: 2005-05-06 Credits: Christian S.J. Peron Affects: All FreeBSD releases prior to 5.4-RELEASE Corrected: 2005-05-06 02:50:00 UTC (RELENG_5, 5.4-STABLE) 2005-05-06 02:51:10 UTC (RELENG_5_4, 5.4-RELEASE) 2005-05-06 02:50:35 UTC (RELENG_5_3, 5.3-RELEASE-p13) 2005-05-06 02:48:46 UTC (RELENG_4, 4.11-STABLE) 2005-05-06 02:49:35 UTC (RELENG_4_11, 4.11-RELEASE-p7) 2005-05-06 02:49:08 UTC (RELENG_4_10, 4.10-RELEASE-p12) CVE Name: CAN-2005-1406 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background In many parts of the FreeBSD kernel, names (of mount points, devices, files, etc.) are manipulated as NULL-terminated strings, but are provided to applications within fixed-length buffers. II. Problem Description In several places, variable-length strings were copied into fixed-length buffers without zeroing the unused portion of the buffer. III. Impact The previous contents of part of the fixed-length buffers will be disclosed to applications. Such memory might contain sensitive information, such as portions of the file cache or terminal buffers. This information might be directly useful, or it might be leveraged to obtain elevated privileges in some way. For example, a terminal buffer might include a user-entered password. IV. Workaround No workaround is available. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 4-STABLE or 5-STABLE, or to the RELENG_5_3, RELENG_4_11, or RELENG_4_10 security branch dated after the correction date. 2) To patch your present system: The following patches have been verified to apply to FreeBSD 4.10, 4.11, and 5.3 systems. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 4.x] # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:08/kmem4.patch # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:08/kmem4.patch.asc [FreeBSD 5.x] # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:08/kmem5.patch # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:08/kmem5.patch.asc b) Apply the patch. # cd /usr/src # patch < /path/to/patch c) Recompile your kernel as described in and reboot the system. VI. Correction details The following list contains the revision numbers of each file that was corrected in FreeBSD. Branch Revision Path - ------------------------------------------------------------------------- RELENG_4 src/sys/kern/vfs_subr.c 1.249.2.32 src/sys/net/if_mib.c 1.8.2.3 src/sys/netinet/ip_divert.c 1.42.2.8 src/sys/netinet/raw_ip.c 1.64.2.20 src/sys/netinet/udp_usrreq.c 1.64.2.20 RELENG_4_11 src/UPDATING 1.72.2.91.2.8 src/sys/conf/newvers.sh 1.44.2.39.2.11 src/sys/kern/vfs_subr.c 1.249.2.31.6.1 src/sys/net/if_mib.c 1.8.2.2.2.1 src/sys/netinet/ip_divert.c 1.42.2.7.2.1 src/sys/netinet/raw_ip.c 1.64.2.19.2.1 src/sys/netinet/udp_usrreq.c 1.64.2.19.6.1 RELENG_4_10 src/UPDATING 1.73.2.90.2.13 src/sys/conf/newvers.sh 1.44.2.34.2.14 src/sys/kern/vfs_subr.c 1.249.2.31.4.1 src/sys/net/if_mib.c 1.8.2.1.16.2 src/sys/netinet/ip_divert.c 1.42.2.6.6.1 src/sys/netinet/raw_ip.c 1.64.2.18.4.1 src/sys/netinet/udp_usrreq.c 1.64.2.19.4.1 RELENG_5 src/sys/kern/subr_bus.c 1.156.2.7 src/sys/kern/vfs_subr.c 1.522.2.5 src/sys/net/if_mib.c 1.13.4.2 src/sys/netinet/ip_divert.c 1.98.2.3 src/sys/netinet/raw_ip.c 1.142.2.5 src/sys/netinet/udp_usrreq.c 1.162.2.8 RELENG_5_4 src/UPDATING 1.342.2.24.2.7 src/sys/kern/subr_bus.c 1.156.2.5.2.1 src/sys/kern/vfs_subr.c 1.522.2.4.2.1 src/sys/net/if_mib.c 1.13.4.1.2.1 src/sys/netinet/ip_divert.c 1.98.2.2.2.1 src/sys/netinet/raw_ip.c 1.142.2.4.2.1 src/sys/netinet/udp_usrreq.c 1.162.2.7.2.1 RELENG_5_3 src/UPDATING 1.342.2.13.2.16 src/sys/conf/newvers.sh 1.62.2.15.2.18 src/sys/kern/subr_bus.c 1.156.2.2.2.1 src/sys/kern/vfs_subr.c 1.522.2.1.2.1 src/sys/net/if_mib.c 1.13.6.1 src/sys/netinet/ip_divert.c 1.98.4.1 src/sys/netinet/raw_ip.c 1.142.2.2.2.1 src/sys/netinet/udp_usrreq.c 1.162.2.3.2.1 - ------------------------------------------------------------------------- The latest revision of this advisory is available at ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:08.kmem.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (FreeBSD) iD8DBQFCet0HFdaIBMps37IRAvxIAJ9iM61VUlJNE8x/yNjjiSJkb3KZ3QCgnbIm SnJAg6SOw/yfRDHoxiKwRIM= =yN6p -----END PGP SIGNATURE-----