From owner-freebsd-security-notifications@FreeBSD.ORG Wed May 31 22:50:42 2006 Return-Path: X-Original-To: freebsd-security-notifications@freebsd.org 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 DCFDC16A990; Wed, 31 May 2006 22:50:42 +0000 (UTC) (envelope-from security-advisories@freebsd.org) Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5BEB143D4C; Wed, 31 May 2006 22:50:42 +0000 (GMT) (envelope-from security-advisories@freebsd.org) Received: from freefall.freebsd.org (cperciva@localhost [127.0.0.1]) by freefall.freebsd.org (8.13.4/8.13.4) with ESMTP id k4VMoguR086246; Wed, 31 May 2006 22:50:42 GMT (envelope-from security-advisories@freebsd.org) Received: (from cperciva@localhost) by freefall.freebsd.org (8.13.4/8.13.4/Submit) id k4VMogZ3086244; Wed, 31 May 2006 22:50:42 GMT (envelope-from security-advisories@freebsd.org) Date: Wed, 31 May 2006 22:50:42 GMT Message-Id: <200605312250.k4VMogZ3086244@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 Cc: Subject: FreeBSD Security Advisory FreeBSD-SA-06:15.ypserv X-BeenThere: freebsd-security-notifications@freebsd.org X-Mailman-Version: 2.1.5 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: Wed, 31 May 2006 22:50:47 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-06:15.ypserv Security Advisory The FreeBSD Project Topic: Inoperative access controls in ypserv(8) Category: core Module: ypserv Announced: 2006-05-31 Credits: Hokan Affects: All FreeBSD 5.x and FreeBSD 6.x releases Corrected: 2006-05-31 22:31:21 UTC (RELENG_6, 6.1-STABLE) 2006-05-31 22:31:42 UTC (RELENG_6_1, 6.1-RELEASE-p1) 2006-05-31 22:32:04 UTC (RELENG_6_0, 6.0-RELEASE-p8) 2006-05-31 22:32:22 UTC (RELENG_5, 5.5-STABLE) 2006-05-31 22:32:49 UTC (RELENG_5_5, 5.5-RELEASE-p1) 2006-05-31 22:33:17 UTC (RELENG_5_4, 5.4-RELEASE-p15) 2006-05-31 22:33:41 UTC (RELENG_5_3, 5.3-RELEASE-p30) CVE Name: CVE-2006-2655 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background The ypserv(8) utility is a server which distributes NIS databases to client systems within an NIS domain. II. Problem Description There are two documented methods of restricting access to NIS maps through ypserv(8): through the use of the /var/yp/securenets file, and through the /etc/hosts.allow file. While both mechanisms are implemented in the server, a change in the build process caused the "securenets" access restrictions to be inadvertantly disabled. III. Impact ypserv(8) will not load or process any of the networks or hosts specified in the /var/yp/securenets file, rendering those access controls ineffective. IV. Workaround One possible workaround is to use /etc/hosts.allow for access control, as shown by examples in that file. Another workaround is to use a firewall (e.g., ipfw(4), ipf(4), or pf(4)) to limit access to RPC functions from untrusted systems or networks, but due to the complexities of RPC, it might be difficult to create a set of firewall rules which accomplish this without blocking all access to the machine in question. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 5-STABLE or 6-STABLE, or to the RELENG_6_1, RELENG_6_0, RELENG_5_5, RELENG_5_4, or RELENG_5_3 security branch dated after the correction date. 2) To patch your present system: The following patches have been verified to apply to FreeBSD 5.3, 5.4, 5.5, 6.0, and 6.1 systems. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch http://security.FreeBSD.org/patches/SA-06:15/ypserv.patch # fetch http://security.FreeBSD.org/patches/SA-06:15/ypserv.patch.asc b) Execute the following commands as root: # cd /usr/src # patch < /path/to/patch # cd /usr/src/usr.sbin/ypserv # make obj && make depend && make && make install VI. Correction details The following list contains the revision numbers of each file that was corrected in FreeBSD. Branch Revision Path - ------------------------------------------------------------------------- RELENG_5 src/usr.sbin/ypserv/yp_access.c 1.22.6.1 RELENG_5_5 src/UPDATING 1.342.2.35.2.1 src/sys/conf/newvers.sh 1.62.2.21.2.3 src/usr.sbin/ypserv/yp_access.c 1.22.18.1 RELENG_5_4 src/UPDATING 1.342.2.24.2.24 src/sys/conf/newvers.sh 1.62.2.18.2.20 src/usr.sbin/ypserv/yp_access.c 1.22.10.1 RELENG_5_3 src/UPDATING 1.342.2.13.2.33 src/sys/conf/newvers.sh 1.62.2.15.2.35 src/usr.sbin/ypserv/yp_access.c 1.22.8.1 RELENG_6 src/usr.sbin/ypserv/yp_access.c 1.22.12.1 RELENG_6_1 src/UPDATING 1.416.2.22.2.3 src/sys/conf/newvers.sh 1.69.2.11.2.3 src/usr.sbin/ypserv/yp_access.c 1.22.16.1 RELENG_6_0 src/UPDATING 1.416.2.3.2.13 src/sys/conf/newvers.sh 1.69.2.8.2.9 src/usr.sbin/ypserv/yp_access.c 1.22.14.1 - ------------------------------------------------------------------------- VII. References http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2655 The latest revision of this advisory is available at http://security.FreeBSD.org/advisories/FreeBSD-SA-06:15.ypserv.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) iD8DBQFEfhuUFdaIBMps37IRAhH5AJ9cpTLcR+aWSRPUa1zUDYThhKDqowCggYr1 4OyjFHW/C+NB9nMIX8Wf7IE= =NNUN -----END PGP SIGNATURE----- From owner-freebsd-security-notifications@FreeBSD.ORG Wed May 31 22:50:48 2006 Return-Path: X-Original-To: freebsd-security-notifications@freebsd.org 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 7CDC216AA0E; Wed, 31 May 2006 22:50:48 +0000 (UTC) (envelope-from security-advisories@freebsd.org) Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id E35BC43D45; Wed, 31 May 2006 22:50:47 +0000 (GMT) (envelope-from security-advisories@freebsd.org) Received: from freefall.freebsd.org (cperciva@localhost [127.0.0.1]) by freefall.freebsd.org (8.13.4/8.13.4) with ESMTP id k4VMolsV086288; Wed, 31 May 2006 22:50:47 GMT (envelope-from security-advisories@freebsd.org) Received: (from cperciva@localhost) by freefall.freebsd.org (8.13.4/8.13.4/Submit) id k4VMolfR086287; Wed, 31 May 2006 22:50:47 GMT (envelope-from security-advisories@freebsd.org) Date: Wed, 31 May 2006 22:50:47 GMT Message-Id: <200605312250.k4VMolfR086287@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 Cc: Subject: FreeBSD Security Advisory FreeBSD-SA-06:16.smbfs X-BeenThere: freebsd-security-notifications@freebsd.org X-Mailman-Version: 2.1.5 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: Wed, 31 May 2006 22:50:51 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-06:16.smbfs Security Advisory The FreeBSD Project Topic: smbfs chroot escape Category: core Module: smbfs Announced: 2006-05-31 Credits: Mark Moseley Affects: All FreeBSD releases. Corrected: 2006-05-31 22:31:21 UTC (RELENG_6, 6.1-STABLE) 2006-05-31 22:31:42 UTC (RELENG_6_1, 6.1-RELEASE-p1) 2006-05-31 22:32:04 UTC (RELENG_6_0, 6.0-RELEASE-p8) 2006-05-31 22:32:22 UTC (RELENG_5, 5.5-STABLE) 2006-05-31 22:32:49 UTC (RELENG_5_5, 5.5-RELEASE-p1) 2006-05-31 22:33:17 UTC (RELENG_5_4, 5.4-RELEASE-p15) 2006-05-31 22:33:41 UTC (RELENG_5_3, 5.3-RELEASE-p30) 2006-05-31 22:34:32 UTC (RELENG_4, 4.11-STABLE) 2006-05-31 22:34:53 UTC (RELENG_4_11, 4.11-RELEASE-p18) 2006-05-31 22:35:32 UTC (RELENG_4_10, 4.10-RELEASE-p24) CVE Name: CVE-2006-2654 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background smbfs is a network file-system used to access file servers using the SMB/CIFS protocol. chroot(2) is system call designed to limit a process's access to a particular subset of a file-system. II. Problem Description smbfs does not properly sanitize paths containing a backslash character; in particular the directory name '..\' is interpreted as the parent directory by the SMB/CIFS server, but smbfs handles it in the same manner as any other directory. III. Impact When inside a chroot environment which resides on a smbfs mounted file-system it is possible for an attacker to escape out of this chroot to any other directory on the smbfs mounted file-system. IV. Workaround Mount the smbfs file-systems which need to be used with chroot on top, in a way so the chroot directory is exactly on the mount point and not a sub directory. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 4-STABLE, 5-STABLE, or 6-STABLE, or to the RELENG_6_1, RELENG_6_0, RELENG_5_5, RELENG_5_4, 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, 5.3, 5.4, 5.5, 6.0, and 6.1 systems. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch http://security.FreeBSD.org/patches/SA-06:16/smbfs.patch # fetch http://security.FreeBSD.org/patches/SA-06:16/smbfs.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/fs/smbfs/smbfs_vnops.c 1.2.2.11 RELENG_4_11 src/UPDATING 1.73.2.91.2.19 src/sys/conf/newvers.sh 1.44.2.39.2.22 src/sys/fs/smbfs/smbfs_vnops.c 1.2.2.10.4.1 RELENG_4_10 src/UPDATING 1.73.2.90.2.25 src/sys/conf/newvers.sh 1.44.2.34.2.26 src/sys/fs/smbfs/smbfs_vnops.c 1.2.2.10.2.1 RELENG_5 src/sys/fs/smbfs/smbfs_vnops.c 1.46.2.2 RELENG_5_5 src/UPDATING 1.342.2.35.2.1 src/sys/conf/newvers.sh 1.62.2.21.2.3 src/sys/fs/smbfs/smbfs_vnops.c 1.46.2.1.4.1 RELENG_5_4 src/UPDATING 1.342.2.24.2.24 src/sys/conf/newvers.sh 1.62.2.18.2.20 src/sys/fs/smbfs/smbfs_vnops.c 1.46.2.1.2.1 RELENG_5_3 src/UPDATING 1.342.2.13.2.33 src/sys/conf/newvers.sh 1.62.2.15.2.35 src/sys/fs/smbfs/smbfs_vnops.c 1.46.4.1 RELENG_6 src/sys/fs/smbfs/smbfs_vnops.c 1.61.2.2 RELENG_6_1 src/UPDATING 1.416.2.22.2.3 src/sys/conf/newvers.sh 1.69.2.11.2.3 src/sys/fs/smbfs/smbfs_vnops.c 1.61.2.1.2.1 RELENG_6_0 src/UPDATING 1.416.2.3.2.13 src/sys/conf/newvers.sh 1.69.2.8.2.9 src/sys/fs/smbfs/smbfs_vnops.c 1.61.4.1 - ------------------------------------------------------------------------- VII. References http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2654 The following three references correspond to independent bugs which affect the Linux kernel but have the same impact: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1863 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1864 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=189434 The latest revision of this advisory is available at http://security.FreeBSD.org/advisories/FreeBSD-SA-06:16.smbfs.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) iD8DBQFEfhueFdaIBMps37IRAquuAJ0eCPAahUu19kdTjKpVHrrtQ9q16gCfZ5sC xknjanFlpMxJAZ7iYSxBvcI= =PvoL -----END PGP SIGNATURE-----