Sincerly,
Klaus
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Hash: SHA1
Liebe Kolleginnen und Kollegen,
soeben erreichte uns nachfolgendes RedHat Security Advisory. Wir
geben
diese Informationen unveraendert an Sie weiter.
CVE-2009-2847 - Linux Kernelfunktion do_sigaltstack() saeubert
Padding
Daten nicht
Auf 64-Bit Architekturen enthaelt die Datenstruktur des Signal
Stacks
einige Padding Bytes. Diese werden von der Linux Kernelfunktion
do_sigaltstack() nicht geloescht, wenn die Datenstruktur nach dem
Aufruf an den Benutzer zurueckgegeben wird. Lokale Angreifer
koennen
dadurch einen Teil des Kernel Speicherbereichs auslesen und so an
evtl. vertrauliche Informationen gelangen.
CVE-2009-2848 - Fehler im Linux execve() System Call
Unter bestimmten Umstaenden wird im Linux execve() System Call der
"current->clear_child_tid" Pointer nicht geloescht, was beim
Anlegen
und Loeschen von Threads dazu fuehrt, das Datenstrukturen im
Kernel
ueberschrieben werden, falls die Threads mit den Flags
CLONE_CHILD_SETTID oder CLONE_CHILD_CLEARTID angelegt werden. Ein
lokaler Angreifer kann dies zu einem Denial of Service Angriff
ausnutzen.
Betroffen sind die folgenden Software Pakete und Plattformen:
Paket kernel
Red Hat Enterprise Linux (v. 5.3.z server) - i386, ia64, noarch,
ppc,
s390x, x86_64
Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.
Hersteller Advisory:
https://rhn.redhat.com/errata/RHSA-2009-1466.html
(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,
Detlev O. Matthies
- --
Detlev O. Matthies, M.Sc. (Incident Response Team)
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
Sachsenstrasse 5, 20097 Hamburg/Germany, CEO: Dr. Klaus-Peter
Kossakowski
Automatische Warnmeldungen https://www.cert.dfn.de/autowarn
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====================================================================
Red Hat Security Advisory
Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2009:1466-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2009-1466.html
Issue date: 2009-09-29
CVE Names: CVE-2009-2847 CVE-2009-2848
=
====================================================================
1. Summary:
Updated kernel packages that fix two security issues and several
bugs are
now available for Red Hat Enterprise Linux 5.3 Extended Update
Support.
This update has been rated as having important security impact by
the Red
Hat Security Response Team.
2. Relevant releases/architectures:
Red Hat Enterprise Linux (v. 5.3.z server) - i386, ia64, noarch,
ppc, s390x, x86_64
3. Description:
The kernel packages contain the Linux kernel, the core of any Linux
operating system.
This update includes backported fixes for two security issues.
These issues
only affected users of Red Hat Enterprise Linux 5.3 Extended
Update Support
as they have already been addressed for users of Red Hat
Enterprise Linux 5
in the 5.4 update, RHSA-2009:1243.
In accordance with the support policy, future security updates to
Red Hat
Enterprise Linux 5.3 Extended Update Support will only include
issues of
critical security impact.
This update fixes the following security issues:
* it was discovered that, when executing a new process, the
clear_child_tid
pointer in the Linux kernel is not cleared. If this pointer points
to a
writable portion of the memory of the new program, the kernel
could corrupt
four bytes of memory, possibly leading to a local denial of
service or
privilege escalation. (CVE-2009-2848, Important)
* a flaw was found in the way the do_sigaltstack() function in the
Linux
kernel copies the stack_t structure to user-space. On 64-bit
machines, this
flaw could lead to a four-byte information leak. (CVE-2009-2847,
Moderate)
This update also fixes the following bugs:
* a regression was found in the SCSI retry logic: SCSI mode select
was not
retried when retryable errors were encountered. In Device-Mapper
Multipath
environments, this could cause paths to fail, or possibly prevent
successful failover. (BZ#506905)
* the gcc flag "-fno-delete-null-pointer-checks" was added to the
kernel
build options. This prevents gcc from optimizing out NULL pointer
checks
after the first use of a pointer. NULL pointer bugs are often
exploited by
attackers, and keeping these checks is considered a safety measure.
(BZ#515468)
* due to incorrect APIC timer calibration, a system hang could have
occurred while booting certain systems. This incorrect timer
calibration
could have also caused the system time to become faster or slower.
With
this update, it is still possible for APIC timer calibration
issues to
occur; however, a clear warning is now provided if they do.
(BZ#521237)
* gettimeofday() experienced poor performance (which caused
performance
problems for applications using gettimeofday()) when running on
hypervisors
that use hardware assisted virtualization. With this update,
MFENCE/LFENCE
is used instead of CPUID for gettimeofday() serialization, which
resolves
this issue. (BZ#523280)
Users should upgrade to these updated packages, which contain
backported
patches to correct these issues. The system must be rebooted for
this
update to take effect.
4. Solution:
Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.
This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259
5. Bugs fixed (http://bugzilla.redhat.com/):
506905 - LTC 49790: Sync up SCSI DH code with mainline changes
[rhel-5.3.z]
515392 - CVE-2009-2847 kernel: information leak in sigaltstack
515423 - CVE-2009-2848 kernel: execve: must clear current-
>clear_child_tid
515468 - kernel: build with -fno-delete-null-pointer-checks
[rhel-5.3.z]
521237 - [RHEL 5] Hang on boot due to wrong APIC timer calibration
[rhel-5.3.z]
523280 - RFE: improve gettimeofday performance on hypervisors
[rhel-5.3.z]
6. Package List:
Red Hat Enterprise Linux (v. 5.3.z server):
i386:
kernel-2.6.18-128.8.1.el5.i686.rpm
kernel-PAE-2.6.18-128.8.1.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-128.8.1.el5.i686.rpm
kernel-PAE-devel-2.6.18-128.8.1.el5.i686.rpm
kernel-debug-2.6.18-128.8.1.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-128.8.1.el5.i686.rpm
kernel-debug-devel-2.6.18-128.8.1.el5.i686.rpm
kernel-debuginfo-2.6.18-128.8.1.el5.i686.rpm
kernel-debuginfo-common-2.6.18-128.8.1.el5.i686.rpm
kernel-devel-2.6.18-128.8.1.el5.i686.rpm
kernel-headers-2.6.18-128.8.1.el5.i386.rpm
kernel-xen-2.6.18-128.8.1.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-128.8.1.el5.i686.rpm
kernel-xen-devel-2.6.18-128.8.1.el5.i686.rpm
ia64:
kernel-2.6.18-128.8.1.el5.ia64.rpm
kernel-debug-2.6.18-128.8.1.el5.ia64.rpm
kernel-debug-debuginfo-2.6.18-128.8.1.el5.ia64.rpm
kernel-debug-devel-2.6.18-128.8.1.el5.ia64.rpm
kernel-debuginfo-2.6.18-128.8.1.el5.ia64.rpm
kernel-debuginfo-common-2.6.18-128.8.1.el5.ia64.rpm
kernel-devel-2.6.18-128.8.1.el5.ia64.rpm
kernel-headers-2.6.18-128.8.1.el5.ia64.rpm
kernel-xen-2.6.18-128.8.1.el5.ia64.rpm
kernel-xen-debuginfo-2.6.18-128.8.1.el5.ia64.rpm
kernel-xen-devel-2.6.18-128.8.1.el5.ia64.rpm
noarch:
kernel-doc-2.6.18-128.8.1.el5.noarch.rpm
ppc:
kernel-2.6.18-128.8.1.el5.ppc64.rpm
kernel-debug-2.6.18-128.8.1.el5.ppc64.rpm
kernel-debug-debuginfo-2.6.18-128.8.1.el5.ppc64.rpm
kernel-debug-devel-2.6.18-128.8.1.el5.ppc64.rpm
kernel-debuginfo-2.6.18-128.8.1.el5.ppc64.rpm
kernel-debuginfo-common-2.6.18-128.8.1.el5.ppc64.rpm
kernel-devel-2.6.18-128.8.1.el5.ppc64.rpm
kernel-headers-2.6.18-128.8.1.el5.ppc.rpm
kernel-headers-2.6.18-128.8.1.el5.ppc64.rpm
kernel-kdump-2.6.18-128.8.1.el5.ppc64.rpm
kernel-kdump-debuginfo-2.6.18-128.8.1.el5.ppc64.rpm
kernel-kdump-devel-2.6.18-128.8.1.el5.ppc64.rpm
s390x:
kernel-2.6.18-128.8.1.el5.s390x.rpm
kernel-debug-2.6.18-128.8.1.el5.s390x.rpm
kernel-debug-debuginfo-2.6.18-128.8.1.el5.s390x.rpm
kernel-debug-devel-2.6.18-128.8.1.el5.s390x.rpm
kernel-debuginfo-2.6.18-128.8.1.el5.s390x.rpm
kernel-debuginfo-common-2.6.18-128.8.1.el5.s390x.rpm
kernel-devel-2.6.18-128.8.1.el5.s390x.rpm
kernel-headers-2.6.18-128.8.1.el5.s390x.rpm
kernel-kdump-2.6.18-128.8.1.el5.s390x.rpm
kernel-kdump-debuginfo-2.6.18-128.8.1.el5.s390x.rpm
kernel-kdump-devel-2.6.18-128.8.1.el5.s390x.rpm
x86_64:
kernel-2.6.18-128.8.1.el5.x86_64.rpm
kernel-debug-2.6.18-128.8.1.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-128.8.1.el5.x86_64.rpm
kernel-debug-devel-2.6.18-128.8.1.el5.x86_64.rpm
kernel-debuginfo-2.6.18-128.8.1.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-128.8.1.el5.x86_64.rpm
kernel-devel-2.6.18-128.8.1.el5.x86_64.rpm
kernel-headers-2.6.18-128.8.1.el5.x86_64.rpm
kernel-xen-2.6.18-128.8.1.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-128.8.1.el5.x86_64.rpm
kernel-xen-devel-2.6.18-128.8.1.el5.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package
7. References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2847
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2848
http://www.redhat.com/security/updates/classification/#important
8. Contact:
The Red Hat security contact is <secal...@redhat.com>. More contact
details at https://www.redhat.com/security/team/contact/
