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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2004.0369 -- FreeBSD-SA-04:11.msync buffer cache invalidation implementation issues 28 May 2004 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel Operating System: FreeBSD Impact: Reduced Security Access Required: Existing Account CVE Names: CAN-2004-0435 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-04:11.msync Security Advisory The FreeBSD Project Topic: buffer cache invalidation implementation issues Category: core Module: sys Announced: 2004-05-26 Credits: Stephan Uphoff <ups@tree.com> Matt Dillon <dillon@apollo.backplane.com> Affects: All FreeBSD versions prior to the correction date Corrected: 2004-05-25 22:46:38 UTC (RELENG_4, 4.10-STABLE) 2004-05-25 23:07:55 UTC (RELENG_5_2, 5.2.1-RELEASE-p8) 2004-05-22 23:09:19 UTC (RELENG_4_10, 4.10-RELEASE) 2004-05-25 23:01:21 UTC (RELENG_4_9, 4.9-RELEASE-p9) 2004-05-25 23:01:19 UTC (RELENG_4_8, 4.8-RELEASE-p22) CVE Name: CAN-2004-0435 FreeBSD only: YES For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:http://www.freebsd.org/security/>. I. Background The msync(2) system call is used by applications to request that modified memory pages are written to permanent storage. II. Problem Description Programming errors in the implementation of the msync(2) system call involving the MS_INVALIDATE operation lead to cache consistency problems between the virtual memory system and on-disk contents. III. Impact In some situations, a user with read access to a file may be able to prevent changes to that file from being committed to disk. IV. Workaround There is no workaround. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 4-STABLE; or to the RELENG_5_2, RELENG_4_10, RELENG_4_9, or RELENG_4_8 security branch dated after the correction date. 2) To patch your present system: The following patches have been verified to apply to FreeBSD 4.8, 4.9, 4.10 and 5.2 systems. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 5.2] # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:11/msync5.patch # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:11/msync5.patch.asc [FreeBSD 4.8, 4.9, 4.10] # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:11/msync4.patch # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:11/msync4.patch.asc b) Apply the patch. # cd /usr/src # patch < /path/to/patch c) Recompile your kernel as described in <URL:http://www.freebsd.org/handbook/kernelconfig.html> 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/ufs/ufs/ufs_readwrite.c 1.65.2.16 src/sys/vm/vm_map.c 1.187.2.30 RELENG_4_10 src/sys/ufs/ufs/ufs_readwrite.c 1.65.2.14.4.1 src/sys/vm/vm_map.c 1.187.2.24.2.4 RELENG_4_9 src/UPDATING 1.73.2.89.2.10 src/sys/conf/newvers.sh 1.44.2.32.2.10 src/sys/ufs/ufs/ufs_readwrite.c 1.65.2.14.2.1 src/sys/vm/vm_map.c 1.187.2.23.2.1 RELENG_4_8 src/UPDATING 1.73.2.80.2.25 src/sys/conf/newvers.sh 1.44.2.29.2.23 src/sys/ufs/ufs/ufs_readwrite.c 1.65.2.13.2.1 src/sys/vm/vm_map.c 1.187.2.17.2.1 RELENG_5_2 src/UPDATING 1.282.2.16 src/sys/conf/newvers.sh 1.56.2.15 src/sys/ufs/ffs/ffs_vnops.c 1.119.2.1 src/sys/vm/vm_object.c 1.317.2.1 - - ------------------------------------------------------------------------- - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFAtH2pFdaIBMps37IRAmycAJ0cv/iG6NlGBsC1xT4gg/Gx3lF8DwCghfHl G2wdUNyfvhz0u3kFB9pH41c= =SK1u - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBQLbbhSh9+71yA2DNAQIjMAP+JhoF+dlAZzwJgB3ytfE9/fBHlR/9+um8 rO7Fb/3fG9iKy9saaEdHJvrZTx8wV/ixpsKGtVRLD2aZivh1mV9oNaGcPdLtTvKF cobEYlPxravGllV45iVjALukEralzCCLwHujUfBreqIyiWDVjE0420XIRUs9x9n3 Dr8wpXSX93A= =Eeux -----END PGP SIGNATURE-----