El-errata: New Ksplice updates for UEKR6 5.4.17 on OL7 and OL8 (ELSA-2020-5996)
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@oracle.com.
New Ksplice updates for UEKR6 5.4.17 on Oracle Linux 7 and 8.
