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Category:Red Hat Local Security Checks
Title:RedHat Security Advisory RHSA-2012:0721
The remote host is missing updates announced in
advisory RHSA-2012:0721.

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

This update fixes the following security issues:

* It was found that the Xen hypervisor implementation as shipped with Red
Hat Enterprise Linux 5 did not properly restrict the syscall return
addresses in the sysret return path to canonical addresses. An unprivileged
user in a 64-bit para-virtualized guest, that is running on a 64-bit host
that has an Intel CPU, could use this flaw to crash the host or,
potentially, escalate their privileges, allowing them to execute arbitrary
code at the hypervisor level. (CVE-2012-0217, Important)

* It was found that guests could trigger a bug in earlier AMD CPUs, leading
to a CPU hard lockup, when running on the Xen hypervisor implementation. An
unprivileged user in a 64-bit para-virtualized guest could use this flaw to
crash the host. Warning: After installing this update, hosts that are using
an affected AMD CPU (refer to Red Hat Bugzilla bug #824966 for a list) will
fail to boot. In order to boot such hosts, the new kernel parameter,
allow_unsafe, can be used (allow_unsafe=on). This option should only be
used with hosts that are running trusted guests, as setting it to on
reintroduces the flaw (allowing guests to crash the host). (CVE-2012-2934,

Note: For Red Hat Enterprise Linux guests, only privileged guest users can
exploit the CVE-2012-0217 and CVE-2012-2934 issues.

Red Hat would like to thank the Xen project for reporting these issues.
Upstream acknowledges Rafal Wojtczuk as the original reporter of

Users should upgrade to these updated packages, which contain backported
patches to correct these issues. The system must be rebooted for this
update to take effect.

Please note that this update is available via
Red Hat Network. To use Red Hat Network, launch the Red
Hat Update Agent with the following command: up2date

Risk factor : High

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2012-0217
Cert/CC Advisory: TA12-164A
CERT/CC vulnerability note: VU#649219
Debian Security Information: DSA-2501 (Google Search)
Debian Security Information: DSA-2508 (Google Search)
FreeBSD Security Advisory: FreeBSD-SA-12:04
Microsoft Security Bulletin: MS12-042
NETBSD Security Advisory: NetBSD-SA2012-003
Common Vulnerability Exposure (CVE) ID: CVE-2012-2934
BugTraq ID: 53961
SuSE Security Announcement: openSUSE-SU-2012:1572 (Google Search)
SuSE Security Announcement: openSUSE-SU-2012:1573 (Google Search)
CopyrightCopyright (c) 2012 E-Soft Inc.

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