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Liebe Kolleginnen und Kollegen,
soeben erreichte uns nachfolgende Warnung des FreeBSD Security
Officers.Wir geben diese Informationen unveraendert an Sie weiter.
Schwachstelle in der FreeBSD Socket Implementierung
FreeBSD beinhaltet eine Schwachstelle in der Socket-Implementierung
fuer Bluetooth und Netgraph(4). FreeBSD verwendet Funktionspointer, um
Funktionen von verschiedenen Socket-Implementierungen zu abstrahieren.
Dabei werden die Funktionspointer von Bluetooth und Netgraph
Socket-Objekten teilweise fehlerhaft initialisiert.
Ein lokaler Angreifer kann diese Schwachstelle ausnutzen, um
beliebigen Code auszufuehren, indem er die Funktionspointer der
Socket-Objekte so manipuliert, dass diese auf von ihm kontrollierte
Speicherbereiche zeigen.
Betroffen sind die folgenden Software Pakete und Plattformen:
Paket sys_kern
FreeBSD Versionen vor den folgenden Erscheinungsdaten
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)
Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.
Hersteller Advisory:
http://security.FreeBSD.org/advisories/FreeBSD-SA-08:13.protosw.asc
(c) der deutschen Zusammenfassung bei DFN-CERT Services GmbH; die
Verbreitung, auch auszugsweise, ist nur unter Hinweis auf den Urheber,
DFN-CERT Services GmbH, und nur zu nicht kommerziellen Zwecken
gestattet.
Mit freundlichen Gruessen,
Klaus Moeller, DFN-CERT
– —
Dipl. Inform. Klaus Moeller (Incident Response Team)
Phone: +49 40 808077-555, Fax: +49 40 808077-556
DFN-CERT Services GmbH, https://www.dfn-cert.de, Phone +49 40 808077-555
Sitz / Register: Hamburg, AG Hamburg, HRB 88805, Ust-IdNr.: DE 232129737
Sachsenstrase 5, 20097 Hamburg/Germany, CEO: Dr. Klaus-Peter Kossakowski
16. DFN-Workshop Sicherheit in vernetzten Systemen
https://www.dfn-cert.de/ws2009/
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=============================================================================
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
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
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