CentOS Update for qemu-guest-agent CESA-2013:0896 centos6

Information

Severity

Severity

Medium

Family

Family

CentOS Local Security Checks

CVSSv2 Base

CVSSv2 Base

6.9

CVSSv2 Vector

CVSSv2 Vector

AV:L/AC:M/Au:N/C:C/I:C/A:C

Solution Type

Solution Type

Vendor Patch

Created

Created

8 years ago

Modified

Modified

3 years ago

Summary

The remote host is missing an update for the 'qemu-guest-agent' package(s) announced via the referenced advisory.

Insight

Insight

KVM (Kernel-based Virtual Machine) is a full virtualization solution for Linux on AMD64 and Intel 64 systems. qemu-kvm is the user-space component for running virtual machines using KVM. It was found that QEMU Guest Agent (the qemu-ga service) created certain files with world-writable permissions when run in daemon mode (the default mode). An unprivileged guest user could use this flaw to consume all free space on the partition containing the qemu-ga log file, or modify the contents of the log. When a UNIX domain socket transport was explicitly configured to be used (not the default), an unprivileged guest user could potentially use this flaw to escalate their privileges in the guest. This update requires manual action. Refer below for details. (CVE-2013-2007) This update does not change the permissions of the existing log file or the UNIX domain socket. For these to be changed, stop the qemu-ga service, and then manually remove all group and other permissions on the affected files, or remove the files. Note that after installing this update, files created by the guest-file-open QEMU Monitor Protocol (QMP) command will still continue to be created with world-writable permissions for backwards compatibility. This issue was discovered by Laszlo Ersek of Red Hat. This update also fixes the following bugs: * Previously, due to integer overflow in code calculations, the qemu-kvm utility was reporting incorrect memory size on QMP events when using the virtio balloon driver with more than 4 GB of memory. This update fixes the overflow in the code and qemu-kvm works as expected in the described scenario. (BZ#958750) * When the set_link flag is set to 'off' to change the status of a network card, the status is changed to down on the respective guest. Previously, with certain network cards, when such a guest was restarted, the status of the network card was unexpectedly reset to up, even though the network was unavailable. A patch has been provided to address this bug and the link status change is now preserved across restarts for all network cards. (BZ#927591) All users of qemu-kvm should upgrade to these updated packages, which contain backported patches to correct these issues. After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.

Affected Software

Affected Software

qemu-guest-agent on CentOS 6

Solution

Solution

Please install the updated packages.

Common Vulnerabilities and Exposures (CVE)

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