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                             CERT-Renater

                 Note d'Information No. 2019/VULN419
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DATE                : 17/12/2019

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Citrix Hypervisor versions 8.0,
                               Citrix XenServer versions 7.

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https://support.citrix.com/article/CTX266932
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Citrix Hypervisor Security Update

Reference: CTX266932

Category : High

Created  : 11 Dec 2019

Modified : 11 Dec 2019

Applicable Products

  o Citrix Hypervisor 8.0
  o XenServer 7.6
  o XenServer 7.1 LTSR Cumulative Update 2
  o XenServer 7.0


Description of Problem

A number of vulnerabilities have been found in Citrix Hypervisor
(formerly Citrix XenServer) that may:

i. Allow the host to be compromised by privileged code in a PV guest VM,

ii. allow unprivileged code in a HVM guest VM to cause that guest to
crash and

iii. under certain conditions, allow an HVM guest VM to cause the host
to eventually run out of memory.

These issues have the following identifiers:

o CVE-2019-19580

o CVE-2019-19583

o CVE-2019-19577

In addition, this hotfix contains updated microcode that addresses an
issue in specific Intel CPU hardware that may allow malicious
unprivileged code within a guest VM to compromise that guest VM.

This issue has the following identifier:

o CVE-2019-14607

These issues affect all currently supported versions of Citrix
Hypervisor up to and including Citrix Hypervisor 8.0.


Mitigating Factors

Customers running only HVM workloads are not affected by the host
compromise issue.

Customers who are not running on AMD hardware, or who do not use PCI
Passthrough functionality, are not affected by the memory exhaustion
issue.

Not all Intel CPUs are affected by the Intel CPU hardware issue.
Details of which CPUs are affected can be found at:
https://www.intel.com/content/www/us/
en/security-center/advisory/intel-sa-00317.html .


What Customers Should Do

Hotfixes have been released to address these issues. Citrix recommends
that affected customers install these hotfixes as their patching
schedules allow.
The hotfixes can be downloaded from the following locations:

Citrix Hypervisor 8.0: CTX263620 -
https://support.citrix.com/article/CTX263620

Citrix XenServer 7.6: CTX263619 -
https://support.citrix.com/article/CTX263619

Citrix XenServer 7.1 LTSR CU2: CTX263618 -
https://support.citrix.com/article/
CTX263618

Citrix XenServer 7.0: CTX263617 -
https://support.citrix.com/article/CTX263617

Changelog

+-------------------------------------+---------------------------------------+
|Date                                 |Change
      |
+-------------------------------------+---------------------------------------+
|11th December 2019                   |Initial Publication
      |
+-------------------------------------+---------------------------------------+


=========================================================
+ CERT-RENATER        | tel : 01-53-94-20-44            +
+ 23/25 Rue Daviel    | fax : 01-53-94-20-41            +
+ 75013 Paris         | email:cert@support.renater.fr   +
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