[El-errata] New Ksplice updates for UEKR6 5.4.17 on OL7 and OL8 (ELSA-2020-5996)

[Errata Announcements for Oracle Linux]

Synopsis: ELSA-2020-5996 can now be patched using Ksplice
CVEs: CVE-2020-12352 CVE-2020-25656 CVE-2020-25668 CVE-2020-25704 CVE-2020-27673 CVE-2020-27675 CVE-2020-28915 CVE-2020-28974

Users with Oracle Linux Premier Support can now use Ksplice to patch
against the latest Oracle Linux Security Advisory, ELSA-2020-5996.
More information about this errata can be found at
https://linux.oracle.com/errata/ELSA-2020-5996.html

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running UEKR6 5.4.17 on
OL7 and OL8 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-2020-28915: Information leak due to out-of-bounds read in Framebuffer Console.

A flaw in the font handling code of the Framebuffer Console could lead to
an out-of-bounds read of kernel memory. A local attacker could use this
flaw to cause an information leak and the system's memory disclosure.


* CVE-2020-28974: Invalid memory access when manipulating framebuffer fonts.

A logic error when manipulating framebuffer console fonts may cause an
out-of-bounds memory read. A local attacker could use this flaw to read
privileged information or potentially cause a denial-of-service.

Orabug: 32187748


* CVE-2020-25704: Denial-of-service in the performance monitoring subsystem.

A possible memory leak when setting performance monitoring filter could lead to
kernel memory exhaustion. A local attacker could use this flaw to cause a
denial-of-service.

Orabug: 32131175


* CVE-2020-25656: Use-after-free in console subsystem.

Specific ioctls sent to the console subsystem could lead to a use-after-free.
A local attacker could use this flaw to read confidential data.

Orabug: 32122952


* CVE-2020-27675: Race condition when reconfiguring para-virtualized Xen devices.

An event-channel removal when reconfiguring paravirtualized devices may cause a
race condition leading to a null pointer dereference. A local attacker could use
this flaw to cause a denial-of-service on a dom0.

XSA-331
Orabug: 32177548


* CVE-2020-12352: Information leak when handling AMP packets in Bluetooth stack.

A missing zeroing of stack memory when handling AMP packets in Bluetooth
stack could lead to an information leak. A remote attacker could use this
flaw to leak information about running kernel and facilitate an attack.


* CVE-2020-25668: Race condition when sending ioctls to a virtual terminal.

A race condition can possibly occur when sending ioctls to a tty device may
cause a use-after-free. A local attacker may use this to cause memory
corruption or a denial-of-service.

Orabug: 32122729


* Note: Oracle will not provide a rebootless update for CVE-2020-27673.

Oracle has determined that patching this vulnerability live on a running system
would not be safe and is recommending to reboot the vulnerable hosts.  Only Xen
dom0 hosts running untrusted VMs are affected by this vulnerability.

Orabug: 32177535


* Disable infiniband completion queue time stamping.

When the time stamping feature is enabled, sensative memory addresses may be
leaked to userspace. A local user could use this to crash the system.

Orabug: 32042517

SUPPORT

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