U radu programskog paketa KVM uočena su i ispravljena dva sigurnosna propusta koja se mogu iskoristiti za izvođenje DoS (eng. Denial of Service) napada ili stjecanje većih ovlasti na ranjivom sustavu.
Paket:
kvm 0.x
Operacijski sustavi:
Red Hat Enterprise Linux 5
Kritičnost:
8.5
Problem:
pogreška u programskoj komponenti, preljev međuspremnika
Iskorištavanje:
udaljeno
Posljedica:
dobivanje većih privilegija, uskraćivanje usluga (DoS)
Rješenje:
programska zakrpa proizvođača
CVE:
CVE-2011-4622, CVE-2012-0029
Izvorni ID preporuke:
RHSA-2012:0051-01
Izvor:
Red Hat
Problem:
Propusti su posljedica načina na koji QEMU-KVM emulira sučelje e1000 kartice i nepravilnog rukovanja PIT (Programmable Interval Timer) IRQ (interrupt requests) zahtjevima kada nije postavljen virtualni kontroler prekida.
Posljedica:
Propusti se mogu iskoristiti za izvođenje DoS napada ili dobivanje većih privilegija.
Rješenje:
Rješenje problema sigurnosti je nadogradnja paketa na novije inačice.
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=====================================================================
Red Hat Security Advisory
Synopsis: Important: kvm security update
Advisory ID: RHSA-2012:0051-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-0051.html
Issue date: 2012-01-23
CVE Names: CVE-2011-4622 CVE-2012-0029
=====================================================================
1. Summary:
Updated kvm packages that fix two security issues are now available for
Red Hat Enterprise Linux 5.
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:
RHEL Desktop Multi OS (v. 5 client) - x86_64
RHEL Virtualization (v. 5 server) - x86_64
3. Description:
KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for
the standard Red Hat Enterprise Linux kernel.
A heap overflow flaw was found in the way QEMU-KVM emulated the e1000
network interface card. A privileged guest user in a virtual machine whose
network interface is configured to use the e1000 emulated driver could use
this flaw to crash the host or, possibly, escalate their privileges on the
host. (CVE-2012-0029)
A flaw was found in the way the KVM subsystem of a Linux kernel handled PIT
(Programmable Interval Timer) IRQs (interrupt requests) when there was no
virtual interrupt controller set up. A malicious user in the kvm group on
the host could force this situation to occur, resulting in the host
crashing. (CVE-2011-4622)
Red Hat would like to thank Nicolae Mogoreanu for reporting CVE-2012-0029.
All KVM users should upgrade to these updated packages, which contain
backported patches to correct these issues. Note: The procedure in the
Solution section must be performed before this update will 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
https://access.redhat.com/kb/docs/DOC-11259
The following procedure must be performed before this update will take
effect:
1) Stop all KVM guest virtual machines.
2) Either reboot the hypervisor machine or, as the root user, remove (using
"modprobe -r [module]") and reload (using "modprobe [module]") all of the
following modules which are currently running (determined using "lsmod"):
kvm, ksm, kvm-intel or kvm-amd.
3) Restart the KVM guest virtual machines.
5. Bugs fixed (http://bugzilla.redhat.com/):
769721 - CVE-2011-4622 kernel: kvm: pit timer with no irqchip crashes the
system
772075 - CVE-2012-0029 qemu-kvm: e1000: process_tx_desc legacy mode packets heap
overflow
6. Package List:
RHEL Desktop Multi OS (v. 5 client):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/kvm-83-239.el5_7.1.src.rpm
x86_64:
kmod-kvm-83-239.el5_7.1.x86_64.rpm
kmod-kvm-debug-83-239.el5_7.1.x86_64.rpm
kvm-83-239.el5_7.1.x86_64.rpm
kvm-debuginfo-83-239.el5_7.1.x86_64.rpm
kvm-qemu-img-83-239.el5_7.1.x86_64.rpm
kvm-tools-83-239.el5_7.1.x86_64.rpm
RHEL Virtualization (v. 5 server):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/kvm-83-239.el5_7.1.src.rpm
x86_64:
kmod-kvm-83-239.el5_7.1.x86_64.rpm
kmod-kvm-debug-83-239.el5_7.1.x86_64.rpm
kvm-83-239.el5_7.1.x86_64.rpm
kvm-debuginfo-83-239.el5_7.1.x86_64.rpm
kvm-qemu-img-83-239.el5_7.1.x86_64.rpm
kvm-tools-83-239.el5_7.1.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://access.redhat.com/security/team/key/#package
7. References:
https://www.redhat.com/security/data/cve/CVE-2011-4622.html
https://www.redhat.com/security/data/cve/CVE-2012-0029.html
https://access.redhat.com/security/updates/classification/#important
8. Contact:
The Red Hat security contact is <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2012 Red Hat, Inc.
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