Scientific Linux Security Update : kvm on SL5.4 i386/x86_64

High Nessus Plugin ID 60730


The remote Scientific Linux host is missing one or more security updates.


The x86 emulator implementation was missing a check for the Current Privilege Level (CPL) and I/O Privilege Level (IOPL). A user in a guest could leverage these flaws to cause a denial of service (guest crash) or possibly escalate their privileges within that guest.
(CVE-2010-0298, CVE-2010-0306)

A flaw was found in the Programmable Interval Timer (PIT) emulation.
Access to the internal data structure pit_state, which represents the data state of the emulated PIT, was not properly validated in the pit_ioport_read() function. A privileged guest user could use this flaw to crash the host. (CVE-2010-0309)

A flaw was found in the USB passthrough handling code. A specially crafted USB packet sent from inside a guest could be used to trigger a buffer overflow in the usb_host_handle_control() function, which runs under the QEMU-KVM context on the host. A user in a guest could leverage this flaw to cause a denial of service (guest hang or crash) or possibly escalate their privileges within the host. (CVE-2010-0297)

This update also fixes the following bugs :

- pvclock MSR values were not preserved during remote migration, causing time drift for guests. (BZ#537028)

- SMBIOS table 4 data is now generated for Windows guests.

- if the qemu-kvm '-net user' option was used, unattended Windows XP installations did not receive an IP address after reboot. (BZ#546562)

- when being restored from migration, a race condition caused Windows Server 2008 R2 guests to hang during shutdown. (BZ#546563)

- the kernel symbol checking on the kvm-kmod build process has a safety check for ABI changes. (BZ#547293)

- on hosts without high-res timers, Windows Server 2003 guests experienced significant time drift. (BZ#547625)

- in some situations, installing Windows Server 2008 R2 from an ISO image resulted in a blue screen 'BAD_POOL_HEADER' stop error. (BZ#548368)

- a bug in the grow_refcount_table() error handling caused infinite recursion in some cases. This caused the qemu-kvm process to hang and eventually crash.

- for Windows Server 2003 R2, Service Pack 2, 32-bit guests, an 'unhandled vm exit' error could occur during reboot on some systems. (BZ#552518)

- for Windows guests, QEMU could attempt to stop a stopped audio device, resulting in a 'snd_playback_stop: ASSERT playback_channel-> failed' error. (BZ#552519)

- the Hypercall driver did not reset the device on power-down. (BZ#552528)

- mechanisms have been added to make older savevm versions to be emitted in some cases. (BZ#552529)

- an error in the Makefile prevented users from using the source RPM to install KVM. (BZ#552530)

- guests became unresponsive and could use up to 100% CPU when running certain benchmark tests with more than 7 guests running simultaneously. (BZ#553249)

- QEMU could terminate randomly with virtio-net and SMP enabled. (BZ#561022)

NOTE - 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.


Update the affected packages.

See Also

Plugin Details

Severity: High

ID: 60730

File Name: sl_20100209_kvm_on_SL5_4.nasl

Version: $Revision: 1.9 $

Type: local

Agent: unix

Published: 2012/08/01

Modified: 2016/12/14

Dependencies: 12634

Risk Information

Risk Factor: High


Base Score: 7.2

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

Vulnerability Information

CPE: x-cpe:/o:fermilab:scientific_linux

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/RedHat/release, Host/RedHat/rpm-list

Patch Publication Date: 2010/02/09

Reference Information

CVE: CVE-2010-0297, CVE-2010-0298, CVE-2010-0306, CVE-2010-0309

CWE: 16, 119, 264