From owner-freebsd-security-notifications@FreeBSD.ORG Fri Apr 15 01:58:07 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 379F216A4CE; Fri, 15 Apr 2005 01:58:07 +0000 (GMT) Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id 295B943D5E; Fri, 15 Apr 2005 01:58:06 +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 j3F1w6uJ068638; Fri, 15 Apr 2005 01:58:06 GMT (envelope-from security-advisories@freebsd.org) Received: (from cperciva@localhost) by freefall.freebsd.org (8.13.3/8.13.1/Submit) id j3F1w6cK068636; Fri, 15 Apr 2005 01:58:06 GMT (envelope-from security-advisories@freebsd.org) Date: Fri, 15 Apr 2005 01:58:06 GMT Message-Id: <200504150158.j3F1w6cK068636@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-05:04.ifconf 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, 15 Apr 2005 01:58:07 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-05:04.ifconf Security Advisory The FreeBSD Project Topic: Kernel memory disclosure in ifconf() Category: core Module: sys_net Announced: 2005-04-15 Credits: Ilja van Sprundel Affects: All FreeBSD 4.x releases All FreeBSD 5.x releases prior to 5.4-RELEASE Corrected: 2005-04-15 01:51:44 UTC (RELENG_5, 5.4-STABLE) 2005-04-15 01:52:03 UTC (RELENG_5_4, 5.4-RELEASE) 2005-04-15 01:52:25 UTC (RELENG_5_3, 5.3-RELEASE-p9) 2005-04-15 01:52:40 UTC (RELENG_4, 4.11-STABLE) 2005-04-15 01:52:57 UTC (RELENG_4_11, 4.11-RELEASE-p3) 2005-04-15 01:53:14 UTC (RELENG_4_10, 4.10-RELEASE-p8) For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background The SIOCGIFCONF ioctl allows a user process to ask the kernel to produce a list of the existing network interfaces and copy it into a buffer provided by the user process. II. Problem Description In generating the list of network interfaces, the kernel writes into a portion of a buffer without first zeroing it. As a result, the prior contents of the buffer will be disclosed to the calling process. III. Impact Up to 12 bytes of kernel memory may be disclosed to the user process. 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 known workaround. 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-05:04/ifconf4.patch # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:04/ifconf4.patch.asc [FreeBSD 5.3] # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:04/ifconf5.patch # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:04/ifconf5.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/net/if.c 1.85.2.29 RELENG_4_11 src/UPDATING 1.73.2.91.2.4 src/sys/conf/newvers.sh 1.44.2.39.2.7 src/sys/net/if.c 1.85.2.28.2.1 RELENG_4_10 src/UPDATING 1.73.2.90.2.9 src/sys/conf/newvers.sh 1.44.2.34.2.10 src/sys/net/if.c 1.85.2.25.2.1 RELENG_5 src/sys/net/if.c 1.199.2.15 RELENG_5_4 src/UPDATING 1.342.2.24.2.3 src/sys/net/if.c 1.199.2.14.2.1 RELENG_5_3 src/UPDATING 1.342.2.13.2.12 src/sys/conf/newvers.sh 1.62.2.15.2.14 src/sys/net/if.c 1.199.2.7.2.3 - ------------------------------------------------------------------------- The latest revision of this advisory is available at ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:04.ifconf.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (FreeBSD) iD8DBQFCXx8LFdaIBMps37IRAgEiAKCYfnAMPrVe72OPJMWtzMNrYmlPNgCfXRNe RYDaRrNgFPGsFWTuVujelco= =xLuH -----END PGP SIGNATURE-----