RHEL 6 : MRG (RHSA-2013:0622)

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 :

Updated kernel-rt packages that fix several security issues and three
bugs are now available for Red Hat Enterprise MRG 2.3.

The Red Hat Security Response Team has rated this update as having
important security impact. Common Vulnerability Scoring System (CVSS)
base scores, which give detailed severity ratings, are available for
each vulnerability from the CVE links in the References section.

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

This update fixes the following security issues :

* A flaw was found in the way file permission checks for the
'/dev/cpu/[x]/msr' files were performed in restricted root
environments (for example, when using a capability-based security
model). A local user with the ability to write to these files could
use this flaw to escalate their privileges to kernel level, for
example, by writing to the SYSENTER_EIP_MSR register. (CVE-2013-0268,

* A race condition was found in the way the Linux kernel's ptrace
implementation handled PTRACE_SETREGS requests when the debuggee was
woken due to a SIGKILL signal instead of being stopped. A local,
unprivileged user could use this flaw to escalate their privileges.
(CVE-2013-0871, Important)

* An out-of-bounds access flaw was found in the way
SOCK_DIAG_BY_FAMILY Netlink messages were processed in the Linux
kernel. A local, unprivileged user could use this flaw to escalate
their privileges. (CVE-2013-1763, Important)

* It was found that the default SCSI command filter does not
accommodate commands that overlap across device classes. A privileged
guest user could potentially use this flaw to write arbitrary data to
a LUN that is passed-through as read-only. (CVE-2012-4542, Moderate)

* A flaw was found in the way the __skb_recv_datagram() function in
the Linux kernel processed payload-less socket buffers (skb) when the
MSG_PEEK option was requested. A local, unprivileged user could use
this flaw to cause a denial of service (infinite loop).
(CVE-2013-0290, Moderate)

The CVE-2012-4542 issue was discovered by Paolo Bonzini of Red Hat.

This update also fixes the following bugs :

* There was high contention on run-queue lock when load balancing
before idling, causing latency spikes on high CPU core count systems.
With this update, IPI is used to send notification to cores with
pending work, and the cores push the work rather than trying to pull
it, resolving this issue. (BZ#858396)

* Previously, ACPI lock was converted to an rt_mutex, leading to a
traceback when scheduling while atomic. With this update, ACPI lock
has been converted back to a raw spinlock. (BZ#909965)

* Fibre Channel (FC)/iSCSI device state was set to off-line and after
a timeout, not set back to running. Such a device would not come back
online after a fast_io_fail or timeout. With this update, an explicit
check for the device being offline has been added, and the device is
set back to running when re-initializing, allowing devices to recover
after a failure or timeout. (BZ#912942)

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

See also :


Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.2
CVSS Temporal Score : 5.6
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 76659 ()

Bugtraq ID: 57838

CVE ID: CVE-2012-4542

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