[RHSA-2011:0028-01] Low: kvm security and bug fix update

[news 28]

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Red Hat Security Advisory

 

Synopsis: Low: kvm security and bug fix update

Advisory ID: RHSA-2011:0028-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2011-0028.html

Issue date: 2011-01-13

CVE Names: CVE-2010-4525

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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 low

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.

 

A data structure field in kvm_vcpu_ioctl_x86_get_vcpu_events() in QEMU-KVM

was not initialized properly before being copied to user-space. A

privileged host user with access to "/dev/kvm" could use this flaw to leak

kernel stack memory to user-space. (CVE-2010-4525)

 

Red Hat would like to thank Stephan Mueller of atsec information security

for reporting this issue.

 

These updated packages also fix several bugs. Documentation for these bug

fixes will be available shortly in the "kvm" section of the Red Hat

Enterprise Linux 5.6 Technical Notes, linked to in the References.

 

All KVM users should upgrade to these updated packages, which resolve this

issue as well as fixing the bugs noted in the Technical Notes. 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

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/):

 

503118 - kvm doesn't run with older libgcrypt, but doesn't have a RPM dependency for it

510630 - -drive arg has no way to request a read only disk

513765 - Large guest ( 256G RAM + 16 vcpu ) hang during live migration

514578 - kvm-qemu-img subpackage has dependency on qspice-libs

517565 - build KVM modules for kernel-debug too

517814 - Caps Lock the key's appearance of guest is not synchronous as host's --view kvm with vnc

520572 - SR-IOV -- Guest exit and host hang on if boot VM with 8 VFs assigned

521247 - emulated pcnet nic in qemu-kvm has wrong PCI subsystem ID for Windows XP driver

533078 - use native smp_call_function_many/single functions

539642 - use native pci_get_bus_and_slot function

542954 - Guest suffers kernel panic when save snapshot then restart guest

555727 - Time drift in win2k3-64bit and win2k8-64bit smp guest

569743 - Change vnc password caused 'Segmentation fault'

572825 - qcow2 image corruption when using cache=writeback

574621 - Linux pvmmu guests (FC11, FC12, etc) crash on boot on AMD hosts with NPT disabled

575585 - memory reported as used (by SwapCache and by Cache) though no process holds it.

580410 - Failed to install kvm for failed dependencies: ksym

580637 - Incorrect russian vnc keymap

582038 - backport EPT accessed bit emulation

583947 - Guest aborted when make guest stop on write error

587604 - Qcow2 snapshot got corruption after commit using block device

587605 - Failed to re-base qcow2 snapshot

588251 - kvm spinning up[censored] a guest pte, unkillable

588878 - Rebooting a kernel with kvmclock enabled, into a kernel with kvmclock disabled, causes random crashes

589017 - [rhel5.5] [kvm] dead lock in qemu during off-line migration

592021 - race condition in pvclock wallclock calculation

598042 - virtio-blk: Avoid zeroing every request structure

598488 - qcow2 corruption bug in refcount table growth

601494 - qemu-io: No permission to write image

603026 - CPU save version is now 9, but the format is _very_ different from non-RHEL5 version 9

605701 - Backport qcow2 fixes to RHEL 5

606238 - Virtio: Transfer file caused guest in same vlan abnormally quit

606394 - [kvm] debug-info missing from kvm-qemu-img-83-164.el5_5.12

606434 - [kvm] segmentation fault when running qemu-img check on faulty image

606651 - [kvm] qemu image check returns cluster errors when using virtIO block (thinly provisioned) during e_no_space events (along with EIO errors)

606953 - fork causes trouble for vcpu threads

611982 - Monitor doesn't check for 'change' command failure

619268 - rmmod kvm modules cause host kernel panic

627343 - husb: ctrl buffer too small error received for passthrough usb device, fixed upstream

629333 - fix build against kernel-devel-2.6.18-214.el5.x86_64: (cancel_work_sync() conflict)

629334 - use native cancel_work_sync() function

632707 - fix kvm build warnings and enable -Werror

637267 - spec file changes for kmod + kernel-devel build

640949 - Can not commit copy-on-write image's data to raw backing-image

641823 - kmod-kvm has unresolved deps

643272 - unresolved deps in kmod-kvm-debug-83-205.el5

643317 - "sendkey ctrl-alt-delete" don't work via VNC

645798 - Add drive readonly option to help output

648328 - TCP checksum overflows in qemu's e1000 emulation code when TSO is enabled in guest OS

651715 - qemu-kvm aborted when installing the driver for the newly hotplugged rtl8139 nic

655990 - clock drift when migrating a guest between mis-matched CPU clock speed

665470 - CVE-2010-4525 kvm: x86: zero kvm_vcpu_events->interrupt.pad infoleak

 

6. Package List:

 

RHEL Desktop Multi OS (v. 5 client):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/kvm-83-224.el5.src.rpm

 

x86_64:

kmod-kvm-83-224.el5.x86_64.rpm

kmod-kvm-debug-83-224.el5.x86_64.rpm

kvm-83-224.el5.x86_64.rpm

kvm-debuginfo-83-224.el5.x86_64.rpm

kvm-qemu-img-83-224.el5.x86_64.rpm

kvm-tools-83-224.el5.x86_64.rpm

 

RHEL Virtualization (v. 5 server):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/kvm-83-224.el5.src.rpm

 

x86_64:

kmod-kvm-83-224.el5.x86_64.rpm

kmod-kvm-debug-83-224.el5.x86_64.rpm

kvm-83-224.el5.x86_64.rpm

kvm-debuginfo-83-224.el5.x86_64.rpm

kvm-qemu-img-83-224.el5.x86_64.rpm

kvm-tools-83-224.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-2010-4525.html

https://access.redhat.com/security/updates/classification/#low

http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/5.6_Technical_Notes/index.html

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://www.redhat.com/security/team/contact/

 

Copyright 2011 Red Hat, Inc.

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