From owner-freebsd-security-notifications Mon May 20 9: 8:19 2002 Delivered-To: freebsd-security-notifications@freebsd.org Received: from freefall.freebsd.org (freefall.FreeBSD.org [216.136.204.21]) by hub.freebsd.org (Postfix) with ESMTP id 6A15837B40F; Mon, 20 May 2002 09:08:06 -0700 (PDT) Received: (from jedgar@localhost) by freefall.freebsd.org (8.11.6/8.11.6) id g4KG86u23944; Mon, 20 May 2002 09:08:06 -0700 (PDT) (envelope-from security-advisories@freebsd.org) Date: Mon, 20 May 2002 09:08:06 -0700 (PDT) Message-Id: <200205201608.g4KG86u23944@freefall.freebsd.org> X-Authentication-Warning: freefall.freebsd.org: jedgar set sender to security-advisories@freebsd.org using -f From: FreeBSD Security Advisories To: FreeBSD Security Advisories Subject: FreeBSD Security Advisory FreeBSD-SA-02:24.k5su Sender: owner-freebsd-security-notifications@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: Reply-To: postmaster@freebsd.org X-Loop: FreeBSD.org -----BEGIN PGP SIGNED MESSAGE----- ============================================================================= FreeBSD-SA-02:24.k5su Security Advisory The FreeBSD Project Topic: k5su utility does not honor `wheel' group Category: kerberos5 Module: kerberos5/usr.bin/k5su Announced: 2002-05-20 Credits: jmallet@FreeBSD.org Affects: FreeBSD 4.4-RELEASE FreeBSD 4.5-RELEASE FreeBSD-STABLE prior to the correction date Corrected: 2002-05-15 12:51:30 UTC (RELENG_4) 2002-05-15 12:56:21 UTC (RELENG_4_5) 2002-05-15 13:04:00 UTC (RELENG_4_4) FreeBSD only: YES I. Background The k5su utility is a SU utility similar to su(1), and is used to switch privileges after authentication using Kerberos 5 or the local passwd(5) file. k5su is installed as part of the `krb5' distribution, or when building from source with MAKE_KERBEROS5 set. Neither of these are default settings. II. Problem Description Historically, the BSD SU utility only allows users who are members of group `wheel' (group-ID 0) to obtain superuser privileges. The k5su utility, however, does not honor this convention and does not verify group membership if a user has successfully authenticated. k5su also lacks other features of su(1), such as checking for password expiration, implementing login classes, and checking for the target user's login shell in /etc/shells. III. Impact Contrary to the expectations of many BSD system administrators, users not in group `wheel' may use k5su to attempt to obtain superuser privileges. Note that this would require knowledge of the root account password, or an explicit entry in the Kerberos 5 `.k5login' ACL for the root account. IV. Solution Remove the set-user-ID bit from the k5su utility: # chmod u-s /usr/bin/k5su This will completely disable k5su. Sites which wish to use Kerberos 5 authentication for SU and are comfortable with its limitations may choose to leave the set-user-ID bit enabled. As of the correction date, FreeBSD (including the upcoming 4.6-RELEASE) will install k5su if requested, but the set-user-ID bit will not be enabled by default. See also the ENABLE_SUID_K5SU option in make.conf(5). VI. Correction details The following list contains the revision numbers of each file that was corrected in FreeBSD. Path Revision Branch - ------------------------------------------------------------------------- src/UPDATING RELENG_4 1.73.2.67 RELENG_4_5 1.73.2.50.2.12 RELENG_4_4 1.73.2.43.2.12 src/etc/defaults/make.conf RELENG_4 1.97.2.65 RELENG_4_5 1.97.2.59.2.1 RELENG_4_4 1.97.2.58.2.1 src/kerberos5/usr.bin/k5su/Makefile RELENG_4 1.73.2.67 RELENG_4_5 1.97.2.59.2.1 RELENG_4_4 1.1.2.2.2.1 src/share/man/man5/make.conf.5 RELENG_4 1.12.2.16 RELENG_4_5 1.12.2.12.2.1 RELENG_4_4 1.12.2.10.2.1 - ------------------------------------------------------------------------- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (FreeBSD) Comment: FreeBSD: The Power To Serve iQCVAwUBPOkdtFUuHi5z0oilAQFd1wP8CUxrBx+DJhQZqLpOocpF4yd8IWclz4Uu 8I8LT5RaWNKMrOt9FB6/jGthRFNqTL72XeDaezxT72IFSUHIpF9wI87aKNVDknPp vQxh0Pr8/8EqvOLhvT6Hu/20xKrBZe2bht/lUQ/HxrgriaZteTAMfMYL653xgP5U M+0f/mfSm3w= =lTOo -----END PGP SIGNATURE----- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security-notifications" in the body of the message From owner-freebsd-security-notifications Mon May 20 9: 8:56 2002 Delivered-To: freebsd-security-notifications@freebsd.org Received: from freefall.freebsd.org (freefall.FreeBSD.org [216.136.204.21]) by hub.freebsd.org (Postfix) with ESMTP id 2366B37B410; Mon, 20 May 2002 09:08:15 -0700 (PDT) Received: (from jedgar@localhost) by freefall.freebsd.org (8.11.6/8.11.6) id g4KG8EH23994; Mon, 20 May 2002 09:08:14 -0700 (PDT) (envelope-from security-advisories@freebsd.org) Date: Mon, 20 May 2002 09:08:14 -0700 (PDT) Message-Id: <200205201608.g4KG8EH23994@freefall.freebsd.org> X-Authentication-Warning: freefall.freebsd.org: jedgar set sender to security-advisories@freebsd.org using -f From: FreeBSD Security Advisories To: FreeBSD Security Advisories Subject: FreeBSD Security Advisory FreeBSD-SA-02:25.bzip2 Sender: owner-freebsd-security-notifications@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: Reply-To: postmaster@freebsd.org X-Loop: FreeBSD.org -----BEGIN PGP SIGNED MESSAGE----- ============================================================================= FreeBSD-SA-02:25 Security Advisory The FreeBSD Project Topic: bzip2 contains multiple security vulnerabilities Category: core/ports Module: bzip2 Announced: 2002-05-20 Credits: Volker Schmidt, Philippe Troin Affects: FreeBSD 4.4-RELEASE, FreeBSD 4.5-RELEASE, FreeBSD 4.5-STABLE prior to the correction date. bzip2 port prior to bzip2-1.0.2 Corrected: 2002-02-18 09:12:53 UTC (4.5-STABLE, RELENG_4) 2002-02-23 18:28:09 UTC (4.5-RELEASE-p1, RELENG_4_5) 2002-02-23 18:33:18 UTC (4.4-RELEASE-p8, RELENG_4_4) 2002-02-22 13:21:22 UTC (bzip2 port) FreeBSD only: NO I. Background bzip2 is an advanced block-sorting file compression utility. II. Problem Description When creating a file during decompression, the bzip2 utility failed to use the O_EXCL flag, potentially overwriting files without warning. In addition, the bzip2 utility did not securely create new files causing a race condition between creating the file and setting the correct permissions. When compressing a file pointed to by a symbolic link, the bzip2 utility incorrectly stored the permissions of the symbolic link instead of the file. This may result in potentially lax file permissions (rwxr-xr-x), causing the decompressed file to be world-readable. bzip2 was incorporated into FreeBSD prior to FreeBSD 4.4-RELEASE. Previous versions of FreeBSD did not contain bzip2 and are unaffected unless bzip2 was installed from the ports collection or manually by the system administrator. III. Impact 1) Files may be inadvertently overwritten without warning. 2) Due to the race condition between creating files and setting proper permissions, a local user may be able to read the contents of files regardless of their intended permissions. 3) Decompressed files that were originally pointed to by a symbolic link may end up with in incorrect permissions, allowing local users to view their contents. IV. Workaround 1) Deinstall the bzip2 port/package if you have it installed. V. Solution [FreeBSD 4.4 or 4.5 base system] 1) Upgrade your vulnerable system to 4.5-STABLE or the RELENG_4_4 or RELENG_4_5 security branch dated after the respective correction dates. 2) To patch your present system, download the relevant patch from the below location, and execute the following commands as root: # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:25/bzip2.patch # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:25/bzip2.patch.asc Verify the detached PGP signature using your PGP utility. This patch has been verified to apply to FreeBSD 4.4-RELEASE and 4.5-RELEASE. # cd /usr/src # patch -p < /path/to/patch # cd lib/libbz2 # make depend && make all install # cd ../../usr.bin/bzip2 # make depend && make all install 3) FreeBSD 4.4-RELEASE and 4.5-RELEASE systems: An experimental upgrade package is available for users who wish to provide testing and feedback on the binary upgrade process. This package may be installed on FreeBSD 4.4-RELEASE and 4.5-RELEASE systems only, and is intended for use on systems for which source patching is not practical or convenient. If you use the upgrade package, feedback (positive or negative) to security-officer@FreeBSD.org is requested so we can improve the process for future advisories. During the installation procedure, backup copies are made of the files which are replaced by the package. These backup copies will be reinstalled if the package is removed, reverting the system to a pre-patched state. # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/packages/SA-02.25/security-patch-bzip2-02.25.tgz # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/packages/SA-02.25/security-patch-bzip2-02.25.tgz.asc Verify the detached PGP signature using your PGP utility. # pkg_add security-patch-bzip2-02.25.tgz [ports] 1) Upgrade your entire ports collection and rebuild the bzip2 port. 2) Deinstall the old package and install a new package dated after the correction date, obtained from the following directories: [i386] ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/archivers/ ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/archivers/ [alpha] Packages are not automatically generated for the alpha architecture at this time due to lack of build resources. NOTE: It may be several days before updated packages are available. Be sure to check the file creation date on the package, because the version number of the software has not changed. 3) Download a new port skeleton for the bzip2 port from: http://www.freebsd.org/ports/ and use it to rebuild the port. 4) Use the portcheckout utility to automate option (3) above. The portcheckout port is available in /usr/ports/devel/portcheckout or the package can be obtained from: ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/Latest/portcheckout.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/Latest/portcheckout.tgz VI. Correction details The following list contains the revision numbers of each file that was corrected in FreeBSD. [Ports collection] Path Revision - ------------------------------------------------------------------------- ports/archivers/bzip2/Makefile 1.36 ports/archivers/bzip2/distinfo 1.10 ports/archivers/bzip2/pkg-descr 1.5 ports/archivers/bzip2/pkg-plist 1.14 - ------------------------------------------------------------------------- [Base system] Branch Path Revision - ------------------------------------------------------------------------- RELENG_4 src/contrib/bzip2/CHANGES 1.1.1.1.2.2 src/contrib/bzip2/FREEBSD-upgrade 1.1.2.1 src/contrib/bzip2/LICENSE 1.1.1.1.2.2 src/contrib/bzip2/Makefile 1.1.1.1.2.2 src/contrib/bzip2/Makefile-libbz2_so 1.1.1.1.2.2 src/contrib/bzip2/README 1.1.1.1.2.2 src/contrib/bzip2/README.COMPILATION.PROBLEMS 1.1.1.1.2.2 src/contrib/bzip2/Y2K_INFO 1.1.1.1.2.1 src/contrib/bzip2/blocksort.c 1.1.1.1.2.2 src/contrib/bzip2/bzip2.1 1.1.1.1.2.2 src/contrib/bzip2/bzip2.c 1.1.1.1.2.2 src/contrib/bzip2/bzip2recover.c 1.1.1.1.2.2 src/contrib/bzip2/bzlib.c 1.1.1.1.2.2 src/contrib/bzip2/bzlib.h 1.1.1.1.2.2 src/contrib/bzip2/bzlib_private.h 1.1.1.1.2.2 src/contrib/bzip2/compress.c 1.1.1.1.2.2 src/contrib/bzip2/crctable.c 1.1.1.1.2.2 src/contrib/bzip2/decompress.c 1.1.1.1.2.2 src/contrib/bzip2/dlltest.c 1.1.1.1.2.2 src/contrib/bzip2/huffman.c 1.1.1.1.2.2 src/contrib/bzip2/libbz2.def 1.1.1.1.2.1 src/contrib/bzip2/makefile.msc 1.1.1.1.2.2 src/contrib/bzip2/manual.texi 1.1.1.1.2.2 src/contrib/bzip2/randtable.c 1.1.1.1.2.2 src/contrib/bzip2/sample1.bz2.uu 1.1.1.1.2.2 src/contrib/bzip2/sample1.ref.gz.uu 1.1.1.1.2.2 src/contrib/bzip2/sample2.bz2.uu 1.1.1.1.2.2 src/contrib/bzip2/sample2.ref.gz.uu 1.1.1.1.2.1 src/contrib/bzip2/sample3.bz2.uu 1.1.1.1.2.2 src/contrib/bzip2/sample3.ref.gz.uu 1.1.1.1.2.1 src/contrib/bzip2/spewG.c 1.1.1.1.2.1 src/contrib/bzip2/unzcrash.c 1.1.1.1.2.1 src/contrib/bzip2/words0 1.1.1.1.2.1 src/contrib/bzip2/words1 1.1.1.1.2.1 src/contrib/bzip2/words2 1.1.1.1.2.1 src/contrib/bzip2/words3 1.1.1.1.2.2 RELENG_4_5 src/sys/conf/newvers.sh 1.44.2.20.2.2 src/contrib/bzip2/CHANGES 1.1.1.1.2.1.4.1 src/contrib/bzip2/FREEBSD-upgrade 1.1.4.1 src/contrib/bzip2/LICENSE 1.1.1.1.2.1.4.1 src/contrib/bzip2/Makefile 1.1.1.1.2.1.4.1 src/contrib/bzip2/Makefile-libbz2_so 1.1.1.1.2.1.4.1 src/contrib/bzip2/README 1.1.1.1.2.1.4.1 src/contrib/bzip2/README.COMPILATION.PROBLEMS 1.1.1.1.2.1.4.1 src/contrib/bzip2/Y2K_INFO 1.1.1.1.2.1 src/contrib/bzip2/blocksort.c 1.1.1.1.2.1.4.1 src/contrib/bzip2/bzip2.1 1.1.1.1.2.1.4.1 src/contrib/bzip2/bzip2.c 1.1.1.1.2.1.4.1 src/contrib/bzip2/bzip2recover.c 1.1.1.1.2.1.4.1 src/contrib/bzip2/bzlib.c 1.1.1.1.2.1.4.1 src/contrib/bzip2/bzlib.h 1.1.1.1.2.1.4.1 src/contrib/bzip2/bzlib_private.h 1.1.1.1.2.1.4.1 src/contrib/bzip2/compress.c 1.1.1.1.2.1.4.1 src/contrib/bzip2/crctable.c 1.1.1.1.2.1.4.1 src/contrib/bzip2/decompress.c 1.1.1.1.2.1.4.1 src/contrib/bzip2/dlltest.c 1.1.1.1.2.1.4.1 src/contrib/bzip2/huffman.c 1.1.1.1.2.1.4.1 src/contrib/bzip2/libbz2.def 1.1.1.1.2.1 src/contrib/bzip2/makefile.msc 1.1.1.1.2.1.4.1 src/contrib/bzip2/manual.texi 1.1.1.1.2.1.4.1 src/contrib/bzip2/randtable.c 1.1.1.1.2.1.4.1 src/contrib/bzip2/sample1.bz2.uu 1.1.1.1.2.1.4.1 src/contrib/bzip2/sample1.ref.gz.uu 1.1.1.1.2.1.4.1 src/contrib/bzip2/sample2.bz2.uu 1.1.1.1.2.1.4.1 src/contrib/bzip2/sample2.ref.gz.uu 1.1.1.1.2.1 src/contrib/bzip2/sample3.bz2.uu 1.1.1.1.2.1.4.1 src/contrib/bzip2/sample3.ref.gz.uu 1.1.1.1.2.1 src/contrib/bzip2/spewG.c 1.1.1.1.2.1 src/contrib/bzip2/unzcrash.c 1.1.1.1.2.1 src/contrib/bzip2/words0 1.1.1.1.2.1 src/contrib/bzip2/words1 1.1.1.1.2.1 src/contrib/bzip2/words2 1.1.1.1.2.1 src/contrib/bzip2/words3 1.1.1.1.2.1.4.1 RELENG_4_4 src/sys/conf/newvers.sh 1.44.2.17.2.7 src/contrib/bzip2/CHANGES 1.1.1.1.2.1.2.1 src/contrib/bzip2/FREEBSD-upgrade 1.1.6.1 src/contrib/bzip2/LICENSE 1.1.1.1.2.1.2.1 src/contrib/bzip2/Makefile 1.1.1.1.2.1.2.1 src/contrib/bzip2/Makefile-libbz2_so 1.1.1.1.2.1.2.1 src/contrib/bzip2/README 1.1.1.1.2.1.2.1 src/contrib/bzip2/README.COMPILATION.PROBLEMS 1.1.1.1.2.1.2.1 src/contrib/bzip2/Y2K_INFO 1.1.1.1.2.1 src/contrib/bzip2/blocksort.c 1.1.1.1.2.1.2.1 src/contrib/bzip2/bzip2.1 1.1.1.1.2.1.2.1 src/contrib/bzip2/bzip2.c 1.1.1.1.2.1.2.1 src/contrib/bzip2/bzip2recover.c 1.1.1.1.2.1.2.1 src/contrib/bzip2/bzlib.c 1.1.1.1.2.1.2.1 src/contrib/bzip2/bzlib.h 1.1.1.1.2.1.2.1 src/contrib/bzip2/bzlib_private.h 1.1.1.1.2.1.2.1 src/contrib/bzip2/compress.c 1.1.1.1.2.1.2.1 src/contrib/bzip2/crctable.c 1.1.1.1.2.1.2.1 src/contrib/bzip2/decompress.c 1.1.1.1.2.1.2.1 src/contrib/bzip2/dlltest.c 1.1.1.1.2.1.2.1 src/contrib/bzip2/huffman.c 1.1.1.1.2.1.2.1 src/contrib/bzip2/libbz2.def 1.1.1.1.2.1 src/contrib/bzip2/makefile.msc 1.1.1.1.2.1.2.1 src/contrib/bzip2/manual.texi 1.1.1.1.2.1.2.1 src/contrib/bzip2/randtable.c 1.1.1.1.2.1.2.1 src/contrib/bzip2/sample1.bz2.uu 1.1.1.1.2.1.2.1 src/contrib/bzip2/sample1.ref.gz.uu 1.1.1.1.2.1.2.1 src/contrib/bzip2/sample2.bz2.uu 1.1.1.1.2.1.2.1 src/contrib/bzip2/sample2.ref.gz.uu 1.1.1.1.2.1 src/contrib/bzip2/sample3.bz2.uu 1.1.1.1.2.1.2.1 src/contrib/bzip2/sample3.ref.gz.uu 1.1.1.1.2.1 src/contrib/bzip2/spewG.c 1.1.1.1.2.1 src/contrib/bzip2/unzcrash.c 1.1.1.1.2.1 src/contrib/bzip2/words0 1.1.1.1.2.1 src/contrib/bzip2/words1 1.1.1.1.2.1 src/contrib/bzip2/words2 1.1.1.1.2.1 src/contrib/bzip2/words3 1.1.1.1.2.1.2.1 - ------------------------------------------------------------------------- All files in src/contrib/bzip2 have identical revision numbers on their respective branches but do not contain the revision number in the source code. VII. References -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (FreeBSD) Comment: FreeBSD: The Power To Serve iQCVAwUBPOkduVUuHi5z0oilAQHJtAP/ZoPk981NwyoAzX+BlL9EM0JAl9bYBSmp lgoSORQhK2Cu5DxqOt1J1GIu3748qrAU4+YkZ5JkucA6UgzDFd+mLcQbE57qrDCs rweqLHipm/fjQ8MXFbs5O2ZlrAPTauAiBYk60OtHEoYe5SE70By4zy8o0jzoKo8H 5dXKGYTnve0= =UUGE -----END PGP SIGNATURE----- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security-notifications" in the body of the message