[Ksplice][Virtuozzo 4.7 Updates] New updates available via Ksplice (2.6.32-042stab108.7)

[Keith Winstein]

Synopsis: 2.6.32-042stab108.7 can now be patched using Ksplice
CVEs: CVE-2011-5321 CVE-2015-1593 CVE-2015-2830 CVE-2015-2922 CVE-2015-3636

Systems running Virtuozzo 4.7 or the OpenVZ RHEL 6 kernel can now use
Ksplice to patch against the latest Parallels Virtuozzo Containers 4.7
kernel security update, 2.6.32-042stab108.7.

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack on Virtuozzo 4.7 or
OpenVZ 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-2011-5321: NULL pointer dereference in TTY subsystem.

Incorrect error handling could result in a NULL pointer dereference when
opening a TTY device.  A local, unprivileged user could use this flaw to
crash the system.


* CVE-2015-1593: Stack layout randomization entropy reduction.

A flaw in the the stack base randomization code could result in a
reduction of entropy by a factor of four.  An attacker could use this
flaw to reduce the amount of work needed to bypass ASLR.


* CVE-2015-2922: Denial-of-service of IPv6 networks when handling router advertisements.

A flaw in the IPv6 stack allowed a remote attacker on the same network to
set the hop limit to a smaller value than the default one, preventing
devices on that network to send or receive.


* CVE-2015-3636: Memory corruption when unhashing IPv4 ping sockets.

The kernel IPv4 subsystem does not correctly handle unhashing a ping
socket which can trigger kernel memory corruption. A local user can use
this flaw to gain elevated privileges.


* CVE-2015-2830: mis-handling of int80 fork from 64bits application.

A flaw in the ret_from_fork assembly stub does not prevent the TS_COMPAT
flag from reaching a user-mode task.  An attacker could potentially use
this flaw to bypass the seccomp or audit protections via a crafted
application.

SUPPORT

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