RHEL 6 : kernel (RHSA-2014:0593)

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 packages that fix two security issues and one bug are
now available for Red Hat Enterprise Linux 6.3 Extended Update
Support.

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

* A flaw was found in the way the Linux kernel's netfilter connection
tracking implementation for Datagram Congestion Control Protocol
(DCCP) packets used the skb_header_pointer() function. A remote
attacker could use this flaw to send a specially crafted DCCP packet
to crash the system or, potentially, escalate their privileges on the
system. (CVE-2014-2523, Important)

* A flaw was found in the way the handle_rx() function handled large
network packets when mergeable buffers were disabled. A privileged
guest user could use this flaw to crash the host or corrupt QEMU
process memory on the host, which could potentially result in
arbitrary code execution on the host with the privileges of the QEMU
process. (CVE-2014-0077, Moderate)

The CVE-2014-0077 issue was discovered by Michael S. Tsirkin of Red
Hat.

This update also fixes the following bug :

* Prior to this update, a guest-provided value was used as the head
length of the socket buffer allocated on the host. If the host was
under heavy memory load and the guest-provided value was too large,
the allocation could have failed, resulting in stalls and packet drops
in the guest's Tx path. With this update, the guest-provided value has
been limited to a reasonable size so that socket buffer allocations on
the host succeed regardless of the memory load on the host, and guests
can send packets without experiencing packet drops or stalls.
(BZ#1092350)

All kernel users are advised to upgrade to these updated packages,
which contain backported patches to correct these issues. The system
must be rebooted for this update to take effect.

See also :

https://www.redhat.com/security/data/cve/CVE-2014-0077.html
https://www.redhat.com/security/data/cve/CVE-2014-2523.html
http://rhn.redhat.com/errata/RHSA-2014-0593.html

Solution :

Update the affected packages.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)

Family: Red Hat Local Security Checks

Nessus Plugin ID: 79024 ()

Bugtraq ID:

CVE ID: CVE-2014-0077
CVE-2014-2523

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