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Test ID:
Category:Red Hat Local Security Checks
Title:RedHat Security Advisory RHSA-2012:0358
The remote host is missing updates announced in
advisory RHSA-2012:0358.

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

This update fixes the following security issues:

* Using PCI passthrough without interrupt remapping support allowed Xen
hypervisor guests to generate MSI interrupts and thus potentially inject
traps. A privileged guest user could use this flaw to crash the host or
possibly escalate their privileges on the host. The fix for this issue can
prevent PCI passthrough working and guests starting. Refer to Red Hat
Bugzilla bug 715555 for details. (CVE-2011-1898, Important)

* IPv6 fragment identification value generation could allow a remote
attacker to disrupt a target system's networking, preventing legitimate
users from accessing its services. (CVE-2011-2699, Important)

* 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. Refer to Red Hat Knowledgebase article 67869, linked to in the
References, for further details about this issue. (CVE-2011-4127,

* A flaw was found in the way the Linux kernel handled robust list pointers
of user-space held futexes across exec() calls. A local, unprivileged user
could use this flaw to cause a denial of service or, eventually, escalate
their privileges. (CVE-2012-0028, Important)

* A missing boundary check was found in the Linux kernel's HFS file system
implementation. A local attacker could use this flaw to cause a denial of
service or escalate their privileges by mounting a specially-crafted disk.
(CVE-2011-4330, Moderate)

Red Hat would like to thank Fernando Gont for reporting CVE-2011-2699, and
Clement Lecigne for reporting CVE-2011-4330.

This update also fixes the following bugs:

* Previously, all timers for a Xen fully-virtualized domain were based on
the time stamp counter (TSC) of the underlying physical CPU. This could
cause observed time to go backwards on some hosts. This update moves all
timers except HPET to the Xen monotonic system time, which fixes the bug as
long as the HPET is removed from the configuration of the domain.

* Previously, tests of the Microsoft Server Virtualization Validation
Program (SVVP) detected unreliability of the emulated HPET (High
Performance Event Timer) on some hosts. Now, HPET can be configured as a
per-domain configuration option
if it is disabled, the guest chooses a
more reliable timer source. Disabling HPET is suggested for Windows guests,
as well as fully-virtualized Linux guests that show occasional time went
backwards errors in the console. (BZ#773360)

* SG_IO ioctls were not implemented correctly in the Red Hat Enterprise
Linux 5 virtio-blk driver. Sending an SG_IO ioctl request to a virtio-blk
disk caused the sending thread to enter an uninterruptible sleep state (D
state). With this update, SG_IO ioctls are rejected by the virtio-blk
the ioctl system call simply returns an ENOTTY (Inappropriate
ioctl for device) error and the thread continues normally. (BZ#784658)

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-2011-1898
SuSE Security Announcement: SUSE-SU-2011:0942 (Google Search)
SuSE Security Announcement: openSUSE-SU-2011:0941 (Google Search)
Common Vulnerability Exposure (CVE) ID: CVE-2011-2699
Common Vulnerability Exposure (CVE) ID: CVE-2011-4127
SuSE Security Announcement: SUSE-SU-2012:0554 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:0812 (Google Search)
Common Vulnerability Exposure (CVE) ID: CVE-2011-4330
BugTraq ID: 50750
Common Vulnerability Exposure (CVE) ID: CVE-2012-0028
CopyrightCopyright (c) 2012 E-Soft Inc.

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