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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2009.0405 -- [FreeBSD] libc: Access Privileged Data 27 April 2009 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: libc Publisher: FreeBSD Operating System: FreeBSD Impact: Access Privileged Data Access: Existing Account Original Bulletin: http://security.freebsd.org/advisories/FreeBSD-SA-09:07.libc.asc - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-09:07.libc Security Advisory The FreeBSD Project Topic: Information leak in db(3) Category: core Module: libc Announced: 2009-04-22 Credits: Jaakko Heinonen, Xin LI Affects: All supported versions of FreeBSD. Corrected: 2009-04-11 15:19:26 UTC (RELENG_7, 7.2-PRERELEASE) 2009-04-22 14:07:14 UTC (RELENG_7_1, 7.1-RELEASE-p5) 2009-04-22 14:07:14 UTC (RELENG_7_0, 7.0-RELEASE-p12) 2009-04-11 15:21:11 UTC (RELENG_6, 6.4-STABLE) 2009-04-22 14:07:14 UTC (RELENG_6_4, 6.4-RELEASE-p4) 2009-04-22 14:07:14 UTC (RELENG_6_3, 6.3-RELEASE-p10) For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:http://security.FreeBSD.org/>. I. Background FreeBSD's C library (libc) contains code for creating and accessing Berkeley DB 1.85 database files. Such databases are used extensively in FreeBSD; for example, the system password files (/etc/passwd and /etc/master.passwd) are normally accessed via their database files (/etc/pwd.db and /etc/spwd.db). II. Problem Description Some data structures used by the database interface code are not properly initialized when allocated. III. Impact Programs using the db(3) interface to create Berkeley database files may "leak" sensitive information into database files. If those files can be read by other users, this may result in the disclosure of sensitive information such as login credentials. IV. Workaround No workaround is available, but systems without untrusted local users are probably not affected (since remote attackers will in most cases not be able to read such database files). V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 6-STABLE, or 7-STABLE, or to the RELENG_7_1, RELENG_7_0, RELENG_6_4, or RELENG_6_3 security branch dated after the correction date. 2) To patch your present system: The following patches have been verified to apply to FreeBSD 6.3, 6.4, 7.0, and 7.1 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-09:07/libc.patch # fetch http://security.FreeBSD.org/patches/SA-09:07/libc.patch.asc b) Execute the following commands as root: # cd /usr/src # patch < /path/to/patch # cd /usr/src/lib/libc # make obj && make depend && make && make install NOTE: On the amd64 platform, the above procedure will not update the lib32 (i386 compatibility) libraries. On amd64 systems where the i386 compatibility libraries are used, the operating system should instead be recompiled as described in <URL:http://www.FreeBSD.org/handbook/makeworld.html> NOTE: System administrators may wish to rebuild any system database files which were created prior to applying this patch in case they contain sensitive information. VI. Correction details The following list contains the revision numbers of each file that was corrected in FreeBSD. CVS: Branch Revision Path - - ------------------------------------------------------------------------- RELENG_6 src/lib/libc/db/btree/bt_split.c 1.7.2.1 src/lib/libc/db/btree/bt_open.c 1.11.14.1 src/lib/libc/db/hash/hash_buf.c 1.7.14.1 src/lib/libc/db/mpool/mpool.c 1.12.2.1 src/lib/libc/db/README 1.1.40.1 RELENG_6_4 src/UPDATING 1.416.2.40.2.8 src/sys/conf/newvers.sh 1.69.2.18.2.10 src/lib/libc/db/btree/bt_split.c 1.7.12.2 src/lib/libc/db/hash/hash_buf.c 1.7.26.2 src/lib/libc/db/mpool/mpool.c 1.12.12.2 RELENG_6_3 src/UPDATING 1.416.2.37.2.15 src/sys/conf/newvers.sh 1.69.2.15.2.14 src/lib/libc/db/btree/bt_split.c 1.7.10.1 src/lib/libc/db/hash/hash_buf.c 1.7.24.1 src/lib/libc/db/mpool/mpool.c 1.12.10.1 RELENG_7 src/lib/libc/db/btree/bt_split.c 1.8.2.1 src/lib/libc/db/btree/bt_open.c 1.12.2.1 src/lib/libc/db/hash/hash_buf.c 1.8.2.1 src/lib/libc/db/mpool/mpool.c 1.13.2.1 src/lib/libc/db/README 1.1.50.1 RELENG_7_1 src/UPDATING 1.507.2.13.2.8 src/sys/conf/newvers.sh 1.72.2.9.2.9 src/lib/libc/db/btree/bt_split.c 1.8.6.2 src/lib/libc/db/hash/hash_buf.c 1.8.6.2 src/lib/libc/db/mpool/mpool.c 1.13.6.2 RELENG_7_0 src/UPDATING 1.507.2.3.2.16 src/sys/conf/newvers.sh 1.72.2.5.2.16 src/lib/libc/db/btree/bt_split.c 1.8.4.1 src/lib/libc/db/hash/hash_buf.c 1.8.4.1 src/lib/libc/db/mpool/mpool.c 1.13.4.1 - - ------------------------------------------------------------------------- Subversion: Branch/path Revision - - ------------------------------------------------------------------------- stable/6/ r190940 releng/6.4/ r191381 releng/6.3/ r191381 stable/7/ r190939 releng/7.1/ r191381 releng/7.0/ r191381 - - ------------------------------------------------------------------------- The latest revision of this advisory is available at http://security.FreeBSD.org/advisories/FreeBSD-SA-09:07.libc.asc - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) iEYEARECAAYFAknvJlkACgkQFdaIBMps37JcyACggmDk96JTy3G5gGlzMlNuVsV7 s5wAoIT2G2c3T6bYa7GeftWLpGGFo2Rp =rdqD - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iD8DBQFJ9SigNVH5XJJInbgRAugwAJoDDKH/73uLe0MaVaoCg2nKLiLBfACZASAU WD27tNEkpLI8fTuchDjm+G0= =nO+R -----END PGP SIGNATURE-----