[Ksplice-cloudlinux6-updates] New updates available via Ksplice (2.6.32-379.19.1.lve1.2.7.el6)

[Sonja Tideman]

Synopsis: 2.6.32-379.19.1.lve1.2.7.el6 can now be patched using Ksplice
CVEs: CVE-2012-2100 CVE-2012-2375 CVE-2012-4444 CVE-2012-4565 CVE-2012-5517

Systems running CloudLinux 6 can now use Ksplice to patch against the
latest CloudLinux 6 kernel update, 2.6.32-379.19.1.lve1.2.7.el6.

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack on CloudLinux 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.


* UB counter overflow leading to crashes.

An extra call to put_beancounter makes it possible for the UB counter to
drop to zero which would cause UB release and crashes.


* Kernel panic on CT migration with open file.

The kernel could panic if a container with a removed file was migrated.

SUPPORT

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