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redhatRedHatRHSA-2011:1850
HistoryDec 22, 2011 - 12:00 a.m.

(RHSA-2011:1850) Important: rhev-hypervisor6 security and bug fix update

2011-12-2200:00:00
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The rhev-hypervisor6 package provides a Red Hat Enterprise Virtualization
Hypervisor ISO disk image. The Red Hat Enterprise Virtualization Hypervisor
is a dedicated Kernel-based Virtual Machine (KVM) hypervisor. It includes
everything necessary to run and manage virtual machines: A subset of the
Red Hat Enterprise Linux operating environment and the Red Hat Enterprise
Virtualization Agent.

Note: Red Hat Enterprise Virtualization Hypervisor is only available for
the Intel 64 and AMD64 architectures with virtualization extensions.

Using the SG_IO IOCTL to issue SCSI requests to partitions or LVM volumes
resulted in the requests being passed to the underlying block device. If a
privileged user only had access to a single partition or LVM volume, they
could use this flaw to bypass those restrictions and gain read and write
access (and be able to issue other SCSI commands) to the entire block
device.

In KVM (Kernel-based Virtual Machine) environments using raw format virtio
disks backed by a partition or LVM volume, a privileged guest user could
bypass intended restrictions and issue read and write requests (and other
SCSI commands) on the host, and possibly access the data of other guests
that reside on the same underlying block device. Refer to Red Hat Bugzilla
bug 752375 for further details and a mitigation script for users who cannot
apply this update immediately. (CVE-2011-4127)

This updated package provides updated components that include fixes for
various security issues. These issues have no security impact on Red Hat
Enterprise Virtualization Hypervisor itself, however. The security fixes
included in this update address the following CVE numbers:

CVE-2011-4539 (dhcp issue)

CVE-2011-4339 (ipmitool issue)

CVE-2011-1530 (krb5 issue)

This update also fixes the following bugs:

  • Virtual LAN (VLAN) identifiers containing a space were accepted, even
    though they could not be configured correctly. With this update, VLAN
    identifiers containing a space are rejected with an “Invalid VLAN ID”
    message. (BZ#761537)

  • After configuring netconsole, it was not possible to start the service:
    the “service netconsole start” command failed with a warning that
    configfs.ko could not be found, and a fatal error that netconsole.ko could
    not be inserted. With this update, the netconsole service starts as
    expected. Note that after netconsole is configured, the service will not
    automatically start, even after rebooting. The service must be manually
    started. (BZ#765898)

Users of the Red Hat Enterprise Virtualization Hypervisor are advised to
upgrade to this updated package, which corrects these issues.