[Ksplice][Ubuntu-14.04-Updates] New updates available via Ksplice (3.13.0-61.100)
Jamie Iles
jamie.iles at oracle.com
Fri Jul 31 12:19:27 PDT 2015
Synopsis: 3.13.0-61.100 can now be patched using Ksplice
CVEs: CVE-2015-1333
Systems running Ubuntu 14.04 Trusty can now use Ksplice to patch
against the latest Ubuntu kernel update, 3.13.0-61.100.
INSTALLING THE UPDATES
We recommend that all users of Ksplice Uptrack on Ubuntu 14.04 Trusty
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-2015-1333: Denial-of-service in the keyring subsystem.
A flaw in the keyring subsystem leads to a memory leak when repeatedly
adding the same key to kernel via the add_key() syscall. A local,
unprivileged user could use this flaw to exhaust the memory on the system
and cause a denial-of-service.
* Disable modification of LDT by userspace processes.
The seldom-used modify_ldt syscall allowing processes to modify their local
descriptor table has several vulnerabilities allowing local unprivileged
users to elevate privileges.
This update disables by default the modify_ldt syscall and introduces a new
sysctl 'ksplice_modify_ldt' to allow administrators to re-enable it.
Re-enabling the syscall will make the machine vulnerable.
To re-enable modify_ldt, run the following command as root:
sysctl ksplice_modify_ldt=1
To disable, run:
sysctl ksplice_modify_ldt=0
This mitigates CVE-2015-3290, CVE-2015-3291 and CVE-2015-5157.
SUPPORT
Ksplice support is available at ksplice-support_ww at oracle.com.
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