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AUSCERT External Security Bulletin Redistribution
ESB-2018.3624.2
Citrix XenServer Security Update
9 January 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Citrix XenServer
Publisher: Citrix
Operating System: Citrix XenServer
Impact/Access: Root Compromise -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-19967 CVE-2018-19965 CVE-2018-19962
CVE-2018-19961
Reference: ESB-2019.0060
ESB-2019.0045
ESB-2019.0030
ESB-2018.3857
Original Bulletin:
https://support.citrix.com/article/CTX239432
Revision History: January 9 2019: Updated CVE identifiers for TBA entries
November 21 2018: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Citrix XenServer Security Update
Created: 20 Nov 2018 | Modified: 08 Jan 2019
Applicable Products
o XenServer 7.6
o XenServer 7.5
o XenServer 7.1 LTSR Cumulative Update 1
o XenServer 7.0
Description of Problem
A number of security vulnerabilities have been identified in Citrix XenServer
that have deployment-dependent impacts.
These issues affect the following supported versions of Citrix XenServer:
o Citrix XenServer 7.6
o Citrix XenServer 7.5
o Citrix XenServer 7.1 LTSR CU1
o Citrix XenServer 7.0
The following issues have been addressed:
o CVE-2018-19961 / CVE-2018-19962: insufficient TLB flushing/improper large
page mappings with AMD IOMMUs
This issue may allow code in an HVM guest VM to compromise the host.
This issue is limited to guests that are using the PCI passthrough feature in
conjunction with AMD CPUs.
o CVE-2018-19965: x86: DoS from attempting to use INVPCID with a
non-canonical address
This issue may allow privileged code in a PV guest VM to crash the host.
This issue is limited to hosts with Intel CPUs that support the INVPCID
instruction.
This issue only occurs in Citrix XenServer 7.6.
o CVE-2018-19967: Intel Erratum: "Processor May Hang When Executing Code In
an HLE Transaction".
This issue may allow code running in a guest VM to cause the host to become
unresponsive and/or crash.
This issue is limited to hosts with Intel CPUs that are affected by the
corresponding Intel erratum.
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What Customers Should Do
Hotfixes have been released to address these issues. Citrix recommends that
affected customers install these hotfixes as their patching schedule permits.
The hotfixes can be downloaded from the following locations:
Citrix XenServer 7.6: CTX239437 - https://support.citrix.com/article/CTX239437
Citrix XenServer 7.5: CTX239436 - https://support.citrix.com/article/CTX239436
Citrix XenServer 7.1 LTSR CU1: CTX239435 - https://support.citrix.com/article/
CTX239435
Citrix XenServer 7.0: CTX239434 - https://support.citrix.com/article/CTX239434
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What Citrix Is Doing
Citrix is notifying customers and channel partners about this potential
security issue. This article is also available from the Citrix Knowledge Center
at http://support.citrix.com/.
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Obtaining Support on This Issue
If you require technical assistance with this issue, please contact Citrix
Technical Support. Contact details for Citrix Technical Support are available
at https://www.citrix.com/support/open-a-support-case.html.
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Reporting Security Vulnerabilities
Citrix welcomes input regarding the security of its products and considers any
and all potential vulnerabilities seriously. For guidance on how to report
security-related issues to Citrix, please see the following document: CTX081743
- - Reporting Security Issues to Citrix
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Changelog
+------------------------+----------------------------------------------------+
|Date |Change |
+------------------------+----------------------------------------------------+
|20th November 2018 |Initial Issue |
+------------------------+----------------------------------------------------+
|8th January 2019 |Updated CVE identifiers for TBA entries |
+------------------------+----------------------------------------------------+
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