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Category:   Application (Generic)  >   KVM Vendors:   kvm.qumranet.com
(Red Hat Issues Fix) KVM E1000 NIC Emulation Heap Overflow Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1026561
SecurityTracker URL:  http://securitytracker.com/id/1026561
CVE Reference:   CVE-2012-0029   (Links to External Site)
Date:  Jan 23 2012
Impact:   Denial of service via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in KVM. A local privileged user on the guest system can obtain elevated privileges on the target host system.

A local privileged user on the guest operating system can send specially crafted legacy mode packets to trigger a heap overflow in the E1000 network interface card (NIC) emulation and cause the host system to crash.

A local privileged user may be able to exploit this to obtain privileges on the host system.

Nicolae Mogoreanu reported this vulnerability.

Impact:   A local privileged user on the guest system can cause denial of service conditions on the target host system.

A local privileged user on the guest system can obtain elevated privileges on the target host system.

Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2012-0051.html

Vendor URL:  linux-kvm.org/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5

Message History:   This archive entry is a follow-up to the message listed below.
Jan 23 2012 KVM E1000 NIC Emulation Heap Overflow Lets Local Users Gain Elevated Privileges



 Source Message Contents

Subject:  [RHSA-2012:0051-01] Important: kvm security update

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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 <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2012 Red Hat, Inc.
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