[Ksplice][EL6-Updates] New updates available via Ksplice (RHSA-2012:1580-1)

[Jamie Iles]

Synopsis: RHSA-2012:1580-1 can now be patched using Ksplice
CVEs: CVE-2012-2100 CVE-2012-2375 CVE-2012-4444 CVE-2012-4565 CVE-2012-5517

Systems running RHCK on Oracle Linux 6, Red Hat Enterprise Linux 6,
CentOS 6, and Scientific Linux 6 can now use Ksplice to patch against
the latest Red Hat Security Advisory, RHSA-2012:1580-1.

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack on OL 6, RHEL 6, CentOS
6, and Scientific Linux 6 install these updates.

On systems that have "autoinstall = yes" in /etc/uptrack/uptrack.conf,
these updates will be installed automatically and you do not need to
take any action.

Alternatively, you can install these updates by running:

# /usr/sbin/uptrack-upgrade -y


DESCRIPTION

* CVE-2012-5517: NULL pointer dereference in memory hotplug.

A NULL pointer dereference can occur when a new node's hot-added
memory is propagated to other nodes zonelists. An unprivileged local
user can use this flaw to crash the system.


* CVE-2012-4444: Prohibit reassembling IPv6 fragments when some data overlaps.

Accepting overlapping fragmented IPv6 packets can lead to OS fingerprinting,
IDS/IPS insertion/evasion, firewall evasion.


* CVE-2012-4565: Divide by zero in TCP congestion control Algorithm.

The TCP Illinois congestion control algorithm does not correctly handle a
zero number of RTTs when reading TCP stats, leading to a divide-by-zero
and kernel panic. A remote attacker could potentially use this flaw to
cause a remote denial of service.


* CVE-2012-2100: Divide-by-zero mounting an ext4 filesystem.

The sanity check added in the original CVE-2009-4307 fix relied on undefined
compiler behaviour, which meant that it worked only on specific architectures
and didn't work on x86 for example.

This fix replaces the check with a standards compliant check which works on
all architectures.


* CVE-2012-2375: Kernel crash in NFSv4.

The upstream fix for CVE-2010-4131 was incomplete and still exploitable
under certain circumstances.  nfs4_getfacl decoding causes a kernel
crash when a server returns more than 2 GETATTR bitmap words in response
to the FATTR4_ACL attribute request.

SUPPORT

Ksplice support is available at ksplice-support_ww at oracle.com.