-----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 . 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 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-----