RHEL 6 : rhev-hypervisor6 (RHSA-2011:1850)

This script is Copyright (C) 2014-2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

An updated rhev-hypervisor6 package that fixes one security issue and
two bugs is 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.

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.

See also :

https://www.redhat.com/security/data/cve/CVE-2011-4127.html
https://bugzilla.redhat.com/show_bug.cgi?id=752375
http://rhn.redhat.com/errata/RHSA-2011-1850.html

Solution :

Update the affected rhev-hypervisor6 and / or rhev-hypervisor6-tools
packages.

Risk factor :

Medium / CVSS Base Score : 4.6
(CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P)

Family: Red Hat Local Security Checks

Nessus Plugin ID: 79281 ()

Bugtraq ID:

CVE ID: CVE-2011-4127

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