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Liebe Kolleginnen und Kollegen,
soeben erreichte uns nachfolgendes RedHat Security Advisory. Wir geben
diese Informationen unveraendert an Sie weiter.
CVE-2010-2240 – Unsichere Behandlung von Stack Overflows im Linux Kernel
Der Linux Kernel behandelt Stack Overflows von Anwendungen nicht
richtig. Eine Anwendung in der ein Stack Overflow auftritt loest nicht
unbedingt eine Schutzverletzung (segmentation fault) aus, sondern kann
andere Speicherbereiche ueberschreiben. Ein lokaler Angreifer kann diese
Schwachstelle zu einer Privilegieneskalation ausnutzen.
CVE-2010-3067 – Integer Overflow in der Funktion do_io_submit()
In der Funktion do_io_submit() des Linux Kernels werden Benutzereingaben
nicht richtig behandelt. Beim Senden einer uebergrossen Zahl von
Input/Output Control Blocks (IOCBs) kann ein Integer Overflow ausgeloest
werden. Ein lokaler Angreifer kann diese Schwachstelle ausnutzen, um
eine Kernelpanik auszuloesen oder schlimmstenfalls beliebige Befehle mit
den Rechten des Kernels zur Ausfuehrung zu bringen.
CVE-2010-3081 – Schwachstelle im Linux Kernel der x86_64 Architektur
Im Linux Kernel fuer die x86_64 Architektur wird bei der Emulation eines
IA32 der Wert des Stack-Pointers falsch in einen 64-Bit Wert
konvertiert. Dabei kann es zu einem Underflow des Stackpointers kommen
was dazu fuehrt, dass dieser in den Speicherbereich des Kernels zeigt.
Da keine Ueberpruefung des Wertes des Stackpointers durchgefuehrt wird,
bleibt der Fehler unbemerkt und erlaubt es einem lokalen Angreifer Daten
in den Speicherbereich des Kernels zu schreiben und mit dessen Rechten
auszufuehren. Bitte beachten Sie, dass bereits ein Exploit fuer diese
Schwachstelle veroeffentlicht wurde.
Betroffen sind die folgenden Software Pakete und Plattformen:
kernel
MRG Realtime for RHEL 5 Server – i386, noarch, x86_64
Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.
(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 808077-590
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-rt security and bug fix update
Advisory ID: RHSA-2010:0758-01
Product: Red Hat Enterprise MRG for RHEL-5
Advisory URL: https://rhn.redhat.com/errata/RHSA-2010-0758.html
Issue date: 2010-10-07
CVE Names: CVE-2010-3067 CVE-2010-3081
=====================================================================
1. Summary:
Updated kernel-rt packages that fix two security issues and three bugs are
now available for Red Hat Enterprise MRG 1.2.
The Red Hat Security Response Team has rated this update as having
important security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.
2. Relevant releases/architectures:
MRG Realtime for RHEL 5 Server – i386, noarch, x86_64
3. Description:
The kernel-rt packages contain the Linux kernel, the core of any Linux
operating system.
This update fixes the following security issues:
* The compat_alloc_user_space() function in the Linux kernel 32/64-bit
compatibility layer implementation was missing sanity checks. This function
could be abused in other areas of the Linux kernel if its length argument
can be controlled from user-space. On 64-bit systems, a local, unprivileged
user could use this flaw to escalate their privileges. (CVE-2010-3081,
Important)
* A missing upper bound integer check was found in the sys_io_submit()
function in the Linux kernel asynchronous I/O implementation. A local,
unprivileged user could use this flaw to cause an information leak.
(CVE-2010-3067, Low)
Red Hat would like to thank Ben Hawkes for reporting CVE-2010-3081, and
Tavis Ormandy for reporting CVE-2010-3067.
This update also fixes the following bugs:
* The RHSA-2010:0631 kernel-rt update resolved an issue (CVE-2010-2240)
where, when an application has a stack overflow, the stack could silently
overwrite another memory mapped area instead of a segmentation fault
occurring. This update implements the official upstream fixes for that
issue. Note: This is not a security regression. The original fix was
complete. (BZ#624604)
* In certain circumstances, under heavy load, certain network interface
cards using the bnx2 driver, and configured to use MSI-X, could stop
processing interrupts and then network connectivity would cease.
(BZ#622952)
* This update upgrades the tg3 driver to version 3.110. (BZ#640334)
Users are advised to 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 all previously-released errata
relevant to your system have been applied.
This update is available via the 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
To install kernel packages manually, use “rpm -ivh [package]”. Do not
use “rpm -Uvh” as that will remove the running kernel binaries from
your system. You may use “rpm -e” to remove old kernels after
determining that the new kernel functions properly on your system.
5. Bugs fixed (http://bugzilla.redhat.com/):
624604 – Backport official CVE-2010-2240 fixes
629441 – CVE-2010-3067 kernel: do_io_submit() infoleak
634457 – CVE-2010-3081 kernel: 64-bit Compatibility Mode Stack Pointer Underflow
640334 – update MRG 1.2 tg3 driver to latest upstream driver
6. Package List:
MRG Realtime for RHEL 5 Server:
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/RHEMRG/SRPMS/kernel-rt-2.6.24.7-169.el5rt.src.rpm
i386:
kernel-rt-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-debug-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-debug-debuginfo-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-debug-devel-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-debuginfo-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-debuginfo-common-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-devel-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-trace-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-trace-debuginfo-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-trace-devel-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-vanilla-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-vanilla-debuginfo-2.6.24.7-169.el5rt.i686.rpm
kernel-rt-vanilla-devel-2.6.24.7-169.el5rt.i686.rpm
noarch:
kernel-rt-doc-2.6.24.7-169.el5rt.noarch.rpm
x86_64:
kernel-rt-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-debug-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-debug-debuginfo-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-debug-devel-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-debuginfo-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-debuginfo-common-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-devel-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-trace-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-trace-debuginfo-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-trace-devel-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-vanilla-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-vanilla-debuginfo-2.6.24.7-169.el5rt.x86_64.rpm
kernel-rt-vanilla-devel-2.6.24.7-169.el5rt.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:
https://www.redhat.com/security/data/cve/CVE-2010-3067.html
https://www.redhat.com/security/data/cve/CVE-2010-3081.html
http://www.redhat.com/security/updates/classification/#important
https://access.redhat.com/kb/docs/DOC-40265
8. Contact:
The Red Hat security contact is
details at https://www.redhat.com/security/team/contact/
Copyright 2010 Red Hat, Inc.
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