[Ksplice][RHEL6-Updates] New updates available via Ksplice (RHSA-2012:1580-1)
Jamie Iles
jamie.iles at oracle.com
Thu Dec 20 06:15:01 PST 2012
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 Red Hat Enterprise 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 RHEL 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.
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