RHEL 6 : qemu-kvm-rhev, qemu-kvm-rhev-tools, qemu-img-rhev (RHSA-2013:1754)
Medium Nessus Plugin ID 78981
SynopsisThe remote Red Hat host is missing one or more security updates.
DescriptionUpdated qemu-kvm-rhev, qemu-kvm-rhev-tools, and qemu-img-rhev packages are now available.
The Red Hat Security Response Team has rated this update as having important 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.
KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. The qemu-kvm-rhev package provides the user-space component for running virtual machines using KVM, in environments managed by Red Hat Enterprise Virtualization Manager.
A buffer overflow flaw was found in the way QEMU processed the SCSI 'REPORT LUNS' command when more than 256 LUNs were specified for a single SCSI target. A privileged guest user could use this flaw to corrupt QEMU process memory on the host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process. (CVE-2013-4344)
This issue was discovered by Asias He of Red Hat.
This update fixes the following bugs :
* In QMP monitor, if an attempt was made to create an image with the same file name as the backing file, an error was generated, but no message was displayed. Performing this action in QMP Monitor now generates the same error message as performing the action in HMP:
'Error: Trying to create an image with the same file name as the backing file'. (BZ#877240)
* QEMU I/O throttling has been disabled in Red Hat Enterprise Linux and is now only available enabled in the Red Hat Enterprise Virtualization QEMU package (qemu-kvm-rhev). (BZ#975468)
* When booting a guest machine, it would still boot when specifying iops and bps as a negative value, without displaying an error message.
This has been fixed so that if a negative value is used the guest does not boot and QEMU exits with the following message 'bps and iops values must be 0 or greater'. (BZ#987725)
* When booting a guest with QMP server, hot plug was failing. It can now do hotplug with QEMU I/O throttling including iops, iops_wr, iops_rd, bps, bps_wr, bps_rd inofs successfully. (BZ#987745)
* Due to a change in virtualization features, all fixes and errata related to Red Hat Enterprise Virtualization specific features, can only be posted to the Red Hat Enterprise Virtualization channel.
Therefore a Red Hat Enterprise Virtualization specific qemu-kvm (for RHEV-H-6.5.0 Errata) was developed. This meant that the qemu-kvm-rhev binary was mapped to a Red Had enterprise Virtualization channel, entitled to Red Hat Enterprise Virtualization customers, and disabled from the Red Hat Enterprise Linux channel. (BZ#997032)
* The qemu-kvm-rhev package now contains /usr/lib64/qemu, as this directory is where CEPH packages provide librbd to be used by QEMU at runtime. (BZ#999705)
* QEMU performed a core dump when iops.bps was set to a negative value. This has been fixed so that it no longer performs a core dump when a negative value is entered, instead an error message is displayed indicating the values must be zero of greater. (BZ#1001436)
* When running the 'rpm -V qemu-kvm-rhev' command, an error was generated stating there were unsatisfied dependencies. This has been fixed so there now are no unsatisfied dependencies and it executes correctly. (BZ#1010930)
In addition, this update adds the following enhancements :
* QEMU I/O throttling allows for finer control of the rate of I/O operations at the QEMU level, and is therefore independent of the underlying storage device. A similar feature can be created by using cgroups at the libvirt level, but cgroups is limited as it does not support some storage devices (such as image files over NFS) and throttles the whole virtual machine, including access to meta-data, while qemu I/O is more fine-grained. (BZ#956825)
* Patches were added to the QEMU block driver for accessing CEPH storage on qemu-kvm-rhev. However,this is not usable on its own, a librbd library still needs to be provided. The librbd library is not provided in Red Hat Enterprise Linux and will be handled by a third party source. (BZ#988079)
SolutionUpdate the affected packages.