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Scientific Linux Security Update : qemu-kvm on SL6.x x86_64 (20120905)
high Nessus Plugin ID 61795
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Synopsis
The remote Scientific Linux host is missing one or more security updates.Description
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.A flaw was found in the way QEMU handled VT100 terminal escape sequences when emulating certain character devices. A guest user with privileges to write to a character device that is emulated on the host using a virtual console back-end could use this flaw to crash the qemu-kvm process on the host or, possibly, escalate their privileges on the host. (CVE-2012-3515)
This flaw did not affect the default use of KVM. Affected configurations were :
- When guests were started from the command line ('/usr/libexec/qemu-kvm') without the '-nodefaults' option, and also without specifying a serial or parallel device, or a virtio-console device, that specifically does not use a virtual console (vc) back-end. (Note that Red Hat does not support invoking 'qemu-kvm' from the command line without '-nodefaults' on Red Hat Enterprise Linux 6.)
- Guests that were managed via libvirt, such as when using Virtual Machine Manager (virt-manager), but that have a serial or parallel device, or a virtio-console device, that uses a virtual console back-end. By default, guests managed via libvirt will not use a virtual console back-end for such devices.
All users of qemu-kvm should upgrade to these updated packages, which resolve this issue. 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.
To resolve dependency issues, the usbredir packages have been added to the repos.
Solution
Update the affected packages.See Also
Plugin Details
Severity: High
ID: 61795
File Name: sl_20120905_qemu_kvm_on_SL6_x.nasl
Version: 1.7
Type: local
Agent: unix
Published: 9/6/2012
Updated: 1/14/2021
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.8
CVSS v2
Risk Factor: High
Base Score: 7.2
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
Vulnerability Information
CPE: p-cpe:/a:fermilab:scientific_linux:qemu-guest-agent, p-cpe:/a:fermilab:scientific_linux:qemu-img, p-cpe:/a:fermilab:scientific_linux:qemu-kvm, p-cpe:/a:fermilab:scientific_linux:qemu-kvm-tools, x-cpe:/o:fermilab:scientific_linux
Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu
Patch Publication Date: 9/5/2012
Vulnerability Publication Date: 11/23/2012
Reference Information
CVE: CVE-2012-3515