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Test ID:1.3.6.1.4.1.25623.1.0.870544
Category:Red Hat Local Security Checks
Title:RedHat Update for kernel RHSA-2012:0107-01
Summary:The remote host is missing an update for the 'kernel'; package(s) announced via the referenced advisory.
Description:Summary:
The remote host is missing an update for the 'kernel'
package(s) announced via the referenced advisory.

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

This update fixes the following security issues:

* 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 DOC-67874, linked to in the
References, for further details about this issue. (CVE-2011-4127,
Important)

* 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 flaw was found in the Linux kernel in the way splitting two extents in
ext4_ext_convert_to_initialized() worked. A local, unprivileged user with
the ability to mount and unmount ext4 file systems could use this flaw to
cause a denial of service. (CVE-2011-3638, Moderate)

* A flaw was found in the way the Linux kernel's journal_unmap_buffer()
function handled buffer head states. On systems that have an ext4 file
system with a journal mounted, a local, unprivileged user could use this
flaw to cause a denial of service. (CVE-2011-4086, Moderate)

* A divide-by-zero flaw was found in the Linux kernel's igmp_heard_query()
function. An attacker able to send certain IGMP (Internet Group Management
Protocol) packets to a target system could use this flaw to cause a denial
of service. (CVE-2012-0207, Moderate)

Red Hat would like to thank Zheng Liu for reporting CVE-2011-3638, and
Simon McVittie for reporting CVE-2012-0207.

This update also fixes the following bugs:

* When a host was in recovery mode and a SCSI scan operation was initiated,
the scan operation failed and provided no error output. This bug has been
fixed and the SCSI layer now waits for recovery of the host to complete
scan operations for devices. (BZ#772162)

* 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
driver: the ioctl system call will simply ...

Description truncated, please see the referenced URL(s) for more information.

Affected Software/OS:
kernel on Red Hat Enterprise Linux (v. 5 server)

Solution:
Please Install the Updated Packages.

CVSS Score:
7.8

CVSS Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:C

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2011-3638
http://www.openwall.com/lists/oss-security/2011/10/24/2
Common Vulnerability Exposure (CVE) ID: CVE-2011-4086
Debian Security Information: DSA-2469 (Google Search)
http://www.debian.org/security/2012/dsa-2469
RedHat Security Advisories: RHSA-2012:0571
http://rhn.redhat.com/errata/RHSA-2012-0571.html
RedHat Security Advisories: RHSA-2012:0670
http://rhn.redhat.com/errata/RHSA-2012-0670.html
http://secunia.com/advisories/48898
http://secunia.com/advisories/48964
SuSE Security Announcement: SUSE-SU-2012:0554 (Google Search)
http://lists.opensuse.org/opensuse-security-announce/2012-04/msg00021.html
SuSE Security Announcement: SUSE-SU-2012:0616 (Google Search)
http://lists.opensuse.org/opensuse-security-announce/2012-05/msg00013.html
Common Vulnerability Exposure (CVE) ID: CVE-2011-4127
http://www.openwall.com/lists/oss-security/2011/12/22/5
SuSE Security Announcement: SUSE-SU-2015:0812 (Google Search)
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00020.html
Common Vulnerability Exposure (CVE) ID: CVE-2012-0028
http://www.openwall.com/lists/oss-security/2012/05/08/1
Common Vulnerability Exposure (CVE) ID: CVE-2012-0207
http://www.openwall.com/lists/oss-security/2012/01/10/5
CopyrightCopyright (c) 2012 Greenbone Networks GmbH

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