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AUSCERT External Security Bulletin Redistribution
ESB-2018.1433.2
Citrix XenServer gets multiple security updates
14 May 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Citrix XenServer
Publisher: Citrix
Operating System: Linux variants
BSD variants
Virtualisation
Impact/Access: Increased Privileges -- Existing Account
Access Privileged Data -- Existing Account
Denial of Service -- Existing Account
Reduced Security -- Unknown/Unspecified
Resolution: Patch/Upgrade
CVE Names: CVE-2018-10982 CVE-2018-8897 CVE-2017-5754
Original Bulletin:
https://support.citrix.com/article/CTX234679
Revision History: May 14 2018: Source article added missing CVE identifier
CVE-2018-10982
May 10 2018: Initial Release
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CTX234679
Citrix XenServer Multiple Security Updates
Security Bulletin | High
Created: 08 May 2018 | Modified: 08 May 2018
Applicable Products
* XenServer 6.0.2
* XenServer 6.2.0
* XenServer 6.5
* XenServer 7.0
* XenServer 7.1
* XenServer 7.2
* XenServer 7.3
* XenServer 7.4
Description of Problem
A number of security vulnerabilities have been identified in Citrix XenServer
that may allow malicious code running in a PV guest VM to compromise the host
and malicious privileged code running in an HVM guest VM to crash the host.
These vulnerabilities affect all currently supported versions of Citrix
XenServer up to and including Citrix XenServer 7.4.
The following vulnerabilities have been addressed:
CVE-2017-5754: (High) Rogue data cache load, memory access permission check
performed after kernel memory read
CVE-2018-10982: (Medium) x86: vHPET interrupt injection errors
CVE-2018-8897: (High) x86: mishandling of debug exceptions
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Mitigating Factors
Customers with only HVM guest VMs with no untrustworthy privileged code running
have mitigated these issues. Note that all Windows VMs are HVM guest VMs.
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What Customers Should Do
Hotfixes have been released to address these issues. Citrix strongly recommends
that affected customers install these hotfixes as soon as possible. The
hotfixes can be downloaded from the following locations:
Citrix XenServer 7.4: CTX234440 - https://support.citrix.com/article/CTX234440
Citrix XenServer 7.3: CTX234439 - https://support.citrix.com/article/CTX234439
Citrix XenServer 7.1 LTSR CU1: CTX234437 - https://support.citrix.com/article/
CTX234437
Citrix XenServer 7.0: CTX234436 - https://support.citrix.com/article/CTX234436
Citrix XenServer 6.5 SP1: CTX234435 - https://support.citrix.com/article/
CTX234435
Citrix XenServer 6.2 SP1: CTX234434 - https://support.citrix.com/article/
CTX234434
Citrix XenServer 6.0.2 Common Criteria: CTX234433 - https://support.citrix.com/
article/CTX234433
In addition, following the publication of CVE-2017-5754, Citrix committed to
provide mitigations for this issue for the Citrix XenServer 7.2 release which
is now End of Life. A hotfix for this release is available at Citrix XenServer
7.2: CTX234438 - https://support.citrix.com/article/CTX234438
Note that, in line with previous statements, the hotfixes for the 6.x versions
of Citrix XenServer do not include mitigations for CVE-2017-5754.
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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 |
|-----------------------------+-----------------------------------------------|
|8th May 2018 |Initial Publication |
+-----------------------------------------------------------------------------+
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