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Old 12-09-2009, 03:33 PM
 
Default Moderate: kvm security and bug fix update

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================================================== ===================
Red Hat Security Advisory

Synopsis: Moderate: kvm security and bug fix update
Advisory ID: RHSA-2009:1659-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2009-1659.html
Issue date: 2009-12-09
CVE Names: CVE-2009-4031
================================================== ===================

1. Summary:

Updated kvm packages that fix one security issue and several bugs are now
available for Red Hat Enterprise Linux 5.

This update has been rated as having moderate security impact by the Red
Hat Security Response Team.

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.

On x86 platforms, the do_insn_fetch() function did not limit the amount of
instruction bytes fetched per instruction. Users in guest operating systems
could leverage this flaw to cause large latencies on SMP hosts that could
lead to a local denial of service on the host operating system. This
update fixes this issue by imposing the architecturally-defined 15 byte
length limit for instructions. (CVE-2009-4031)

This update also fixes the following bugs:

* performance problems occurred when using the qcow2 image format with the
qemu-kvm -drive "cache=none" option (the default setting when not specified
otherwise). This could cause guest operating system installations to take
hours. With this update, performance patches have been backported so that
using the qcow2 image format with the "cache=none" option no longer causes
performance issues. (BZ#520693)

* when using the virtual vm8086 mode, bugs in the emulated hardware task
switching implementation may have, in some situations, caused older guest
operating systems to malfunction. (BZ#532031)

* Windows Server 2003 guests (32-bit) with more than 4GB of memory may have
crashed during reboot when using the default qemu-kvm CPU settings.
(BZ#532043)

* with Red Hat Enterprise Virtualization, guests continued to run after
encountering disk read errors. This could have led to their file systems
becoming corrupted (but not the host's), notably in environments that use
networked storage. With this update, the qemu-kvm -drive "werror=stop"
option now applies not only to write errors but also to read errors: When
using this option, guests will pause on disk read and write errors.

By default, guests managed by Red Hat Enterprise Virtualization use the
"werror=stop" option. This option is not used by default for guests managed
by libvirt. (BZ#537334, BZ#540406)

* the para-virtualized block driver (virtio-blk) silently ignored read
errors when accessing disk images. With this update, the driver correctly
signals the read error to the guest. (BZ#537334)

All KVM users should upgrade to these updated packages, which contain
backported patches to resolve 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 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

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/):

532031 - KVM does not implement proper support for hardware task linking when using vm8086 mode
532043 - qemu aborted when restart 32bitwin23k with more than 4G mem in intel host.
537334 - O/S Filesystem Corruption with RHEL-5.4 on a RHEV Guest
540406 - RHEL5.4 VM image corruption with an IDE v-disk
541160 - CVE-2009-4031 kernel: KVM: x86 emulator: limit instructions to 15 bytes

6. Package List:

RHEL Desktop Multi OS (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/kvm-83-105.el5_4.13.src.rpm

x86_64:
kmod-kvm-83-105.el5_4.13.x86_64.rpm
kvm-83-105.el5_4.13.x86_64.rpm
kvm-debuginfo-83-105.el5_4.13.x86_64.rpm
kvm-qemu-img-83-105.el5_4.13.x86_64.rpm
kvm-tools-83-105.el5_4.13.x86_64.rpm

RHEL Virtualization (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/kvm-83-105.el5_4.13.src.rpm

x86_64:
kmod-kvm-83-105.el5_4.13.x86_64.rpm
kvm-83-105.el5_4.13.x86_64.rpm
kvm-debuginfo-83-105.el5_4.13.x86_64.rpm
kvm-qemu-img-83-105.el5_4.13.x86_64.rpm
kvm-tools-83-105.el5_4.13.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-2009-4031
http://www.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2009 Red Hat, Inc.
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Old 02-21-2012, 03:59 AM
 
Default Moderate: kvm security and bug fix update

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================================================== ===================
Red Hat Security Advisory

Synopsis: Moderate: kvm security and bug fix update
Advisory ID: RHSA-2012:0149-03
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-0149.html
Issue date: 2012-02-21
CVE Names: CVE-2011-4347
================================================== ===================

1. Summary:

Updated kvm packages that fix one security issue and several bugs are now
available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link 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.

It was found that the kvm_vm_ioctl_assign_device() function in the KVM
subsystem of a Linux kernel did not check if the user requesting device
assignment was privileged or not. A member of the kvm group on the host
could assign unused PCI devices, or even devices that were in use and
whose resources were not properly claimed by the respective drivers, which
could result in the host crashing. (CVE-2011-4347)

Red Hat would like to thank Sasha Levin for reporting this issue.

These updated kvm packages include several bug fixes. Space precludes
documenting all of these changes in this advisory. Users are directed to
the Red Hat Enterprise Linux 5.8 Technical Notes, linked to in the
References, for information on the most significant of these changes.

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/):

701616 - limitation on max number of assigned devices does not take effect if hot-plug pci devices
703335 - KVM guest clocks jump forward one hour on reboot
703446 - Failed to ping guest after MTU is changed
704081 - mouse responds very slowly with huge memory
725876 - RTC interrupt problems with RHEL5 qemu/kvm (0.10 based) on 2.6.38+ guest kernels.
753860 - Fix kvm userspace compilation on RHEL-5 to match the kernel changes
756084 - CVE-2011-4347 kernel: kvm: device assignment DoS

6. Package List:

RHEL Desktop Multi OS (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/kvm-83-249.el5.src.rpm

x86_64:
kmod-kvm-83-249.el5.x86_64.rpm
kmod-kvm-debug-83-249.el5.x86_64.rpm
kvm-83-249.el5.x86_64.rpm
kvm-debuginfo-83-249.el5.x86_64.rpm
kvm-qemu-img-83-249.el5.x86_64.rpm
kvm-tools-83-249.el5.x86_64.rpm

RHEL Virtualization (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/kvm-83-249.el5.src.rpm

x86_64:
kmod-kvm-83-249.el5.x86_64.rpm
kmod-kvm-debug-83-249.el5.x86_64.rpm
kvm-83-249.el5.x86_64.rpm
kvm-debuginfo-83-249.el5.x86_64.rpm
kvm-qemu-img-83-249.el5.x86_64.rpm
kvm-tools-83-249.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://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2011-4347.html
https://access.redhat.com/security/updates/classification/#moderate
https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/5.8_Technical_Notes/kvm.html#RHSA-2012-0149

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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Old 05-21-2012, 05:16 PM
 
Default Moderate: kvm security and bug fix update

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Hash: SHA1

================================================== ===================
Red Hat Security Advisory

Synopsis: Moderate: kvm security and bug fix update
Advisory ID: RHSA-2012:0676-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-0676.html
Issue date: 2012-05-21
CVE Names: CVE-2012-1601 CVE-2012-2121
================================================== ===================

1. Summary:

Updated kvm packages that fix two security issues and one bug are now
available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having moderate
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 flaw was found in the way the KVM_CREATE_IRQCHIP ioctl was handled.
Calling this ioctl when at least one virtual CPU (VCPU) already existed
could lead to a NULL pointer dereference later when the VCPU is scheduled
to run. A malicious user in the kvm group on the host could use this flaw
to crash the host. (CVE-2012-1601)

A flaw was found in the way device memory was handled during guest device
removal. Upon successful device removal, memory used by the device was not
properly unmapped from the corresponding IOMMU or properly released from
the kernel, leading to a memory leak. A malicious user in the kvm group on
the host who has the ability to assign a device to a guest could use this
flaw to crash the host. (CVE-2012-2121)

This update also fixes the following bug:

* An off-by-one error in the QEMU guest's memory management could, in rare
cases, cause QEMU-KVM to crash due to a segmentation fault in
tb_invalidate_phys_page_range() if a device initiated DMA into a specific
guest address. In a reported case, this issue presented on a system that
had a guest using the 8139cp network driver. (BZ#816207)

All users of kvm are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. Note that 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/knowledge/articles/11258

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/):

808199 - CVE-2012-1601 kernel: kvm: irqchip_in_kernel() and vcpu->arch.apic inconsistency
814149 - CVE-2012-2121 kvm: device assignment page leak

6. Package List:

RHEL Desktop Multi OS (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/kvm-83-249.el5_8.4.src.rpm

x86_64:
kmod-kvm-83-249.el5_8.4.x86_64.rpm
kmod-kvm-debug-83-249.el5_8.4.x86_64.rpm
kvm-83-249.el5_8.4.x86_64.rpm
kvm-debuginfo-83-249.el5_8.4.x86_64.rpm
kvm-qemu-img-83-249.el5_8.4.x86_64.rpm
kvm-tools-83-249.el5_8.4.x86_64.rpm

RHEL Virtualization (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/kvm-83-249.el5_8.4.src.rpm

x86_64:
kmod-kvm-83-249.el5_8.4.x86_64.rpm
kmod-kvm-debug-83-249.el5_8.4.x86_64.rpm
kvm-83-249.el5_8.4.x86_64.rpm
kvm-debuginfo-83-249.el5_8.4.x86_64.rpm
kvm-qemu-img-83-249.el5_8.4.x86_64.rpm
kvm-tools-83-249.el5_8.4.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-2012-1601.html
https://www.redhat.com/security/data/cve/CVE-2012-2121.html
https://access.redhat.com/security/updates/classification/#moderate

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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