|| ||firstname.lastname@example.org |
|| ||email@example.com |
|| ||Security ERRATA Important: qemu-kvm on SL6.x x86_64 |
|| ||Wed, 11 Jan 2012 10:11:54 -0600|
|| ||Article, Thread
Synopsis: Important: qemu-kvm security update
Issue Date: 2011-12-06
CVE Numbers: CVE-2011-4111
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-kvm did not properly drop supplemental group
privileges when the root user started guests from the command line
("/usr/libexec/qemu-kvm") with the "-runas" option. A qemu-kvm process
started this way could use this flaw to gain access to files on the host
that are accessible to the supplementary groups and not accessible to the
primary group. (CVE-2011-2527)
Note: This issue only affected qemu-kvm when it was started directly from
the command line. It did not affect applications that start qemu-kvm via
libvirt, such as the Virtual Machine Manager (virt-manager).
A flaw was found in the way qemu-kvm handled VSC_ATR messages when a guest
was configured for a CCID (Chip/Smart Card Interface Devices) USB smart
card reader in passthrough mode. An attacker able to connect to the port on
the host being used for such a device could use this flaw to crash the
qemu-kvm process on the host or, possibly, escalate their privileges on the
All users of qemu-kvm should upgrade to these updated packages, which
contain a backported patch to 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.
A number of additional packages were added to the security repository so
that this package could be installed on older SL systems.
- Scientific Linux Development Team
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