Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2009.1160 -- [FreeBSD] netgraph / bluetooth privilege escalation 5 January 2009 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: protosw Publisher: FreeBSD Operating System: FreeBSD Impact: Execute Arbitrary Code/Commands Increased Privileges Access: Existing Account CVE Names: CVE-2008-5736 Original Bulletin: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-08:13.protosw.asc Revision History: January 5 2009: Added CVE Reference December 23 2008: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-08:13.protosw Security Advisory The FreeBSD Project Topic: netgraph / bluetooth privilege escalation Category: core Module: sys_kern Announced: 2008-12-23 Credits: Christer Oberg Affects: All FreeBSD releases Corrected: 2008-12-23 01:23:09 UTC (RELENG_7, 7.1-PRERELEASE) 2008-12-23 01:23:09 UTC (RELENG_7_1, 7.1-RC2) 2008-12-23 01:23:09 UTC (RELENG_7_0, 7.0-RELEASE-p7) 2008-12-23 01:23:09 UTC (RELENG_6, 6.4-STABLE) 2008-12-23 01:23:09 UTC (RELENG_6_4, 6.4-RELEASE-p1) 2008-12-23 01:23:09 UTC (RELENG_6_3, 6.3-RELEASE-p7) 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 The FreeBSD kernel provides support for a variety of different types of communications sockets, including IPv4, IPv6, ISDN, ATM, routing protocol, link-layer, netgraph(4), and bluetooth sockets. As an early form of object-oriented design, much of the functionality specific to different types of sockets is abstracted via function pointers. II. Problem Description Some function pointers for netgraph and bluetooth sockets are not properly initialized. III. Impact A local user can cause the FreeBSD kernel to execute arbitrary code. This could be used by an attacker directly; or it could be used to gain root privilege or to escape from a jail. IV. Workaround No workaround is available, but systems without local untrusted users are not vulnerable. Furthermore, systems are not vulnerable if they have neither the ng_socket nor ng_bluetooth kernel modules loaded or compiled into the kernel. Systems with the security.jail.socket_unixiproute_only sysctl set to 1 (the default) are only vulnerable if they have local untrusted users outside of jails. If the command # kldstat -v | grep ng_ produces no output, the system is not vulnerable. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 6-STABLE, or 7-STABLE, or to the 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, and 7.0 systems. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 6.x] # fetch http://security.FreeBSD.org/patches/SA-08:13/protosw6x.patch # fetch http://security.FreeBSD.org/patches/SA-08:13/protosw6x.patch.asc [FreeBSD 7.x] # fetch http://security.FreeBSD.org/patches/SA-08:13/protosw.patch # fetch http://security.FreeBSD.org/patches/SA-08:13/protosw.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. CVS: Branch Revision Path - - ------------------------------------------------------------------------- RELENG_6 src/sys/kern/uipc_domain.c 1.44.2.4 RELENG_6_4 src/UPDATING 1.416.2.40.2.4 src/sys/conf/newvers.sh 1.69.2.18.2.7 src/sys/kern/uipc_domain.c 1.44.2.3.6.2 RELENG_6_3 src/UPDATING 1.416.2.37.2.12 src/sys/conf/newvers.sh 1.69.2.15.2.11 src/sys/kern/uipc_domain.c 1.44.2.3.4.1 RELENG_7 src/sys/kern/uipc_domain.c 1.51.2.2 RELENG_7_1 src/UPDATING 1.507.2.13.2.2 src/sys/kern/uipc_domain.c 1.51.2.1.2.2 RELENG_7_0 src/UPDATING 1.507.2.3.2.11 src/sys/conf/newvers.sh 1.72.2.5.2.11 src/sys/kern/uipc_domain.c 1.51.4.1 - - ------------------------------------------------------------------------- Subversion: Branch/path Revision - - ------------------------------------------------------------------------- stable/6/ r186405 releng/6.4/ r186405 releng/6.3/ r186405 stable/7/ r186405 releng/7.1/ r186405 releng/7.0/ r186405 - - ------------------------------------------------------------------------- VII. References The latest revision of this advisory is available at http://security.FreeBSD.org/advisories/FreeBSD-SA-08:13.protosw.asc - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) iEYEARECAAYFAklQP9QACgkQFdaIBMps37KL2gCfRlQ7kTB24DYnDEGRUC+px4bX 214AoJJrJjaeS6ITyk73AL/OK+rNAM4u =7qyU - -----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. NOTE: Third Party Rights 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 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 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 iQCVAwUBSWFVnyh9+71yA2DNAQJvsAP/W0cizMk88VPI8lZnolI3vww0aEh7NnOk cjLdAlMhH98FNy4mLOznEMpzb7zYrPuA6KmedqT0uLP3DtnHLFSkJqGAomUu9wIN TLquJl2AS2etrv5cqD8L8Up3kfLua3F/oCuZ9udncoyTzWDicuGN10FVXTtKBT/f 3wlUXTFutAs= =8Hgs -----END PGP SIGNATURE-----