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AUSCERT External Security Bulletin Redistribution
ESB-2017.3094
Citrix XenServer Multiple Security Updates
4 December 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Citrix XenServer
Publisher: Citrix
Operating System: Xen
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2017-17045 CVE-2017-17044 CVE-2017-15592
CVE-2017-7980
Reference: ESB-2017.3002
ESB-2017.2873
ESB-2017.2871
ESB-2017.1167
ESB-2017.1109
Original Bulletin:
https://support.citrix.com/article/CTX230138
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CTX230138
Citrix XenServer Multiple Security Updates
Security Bulletin | High | Created: 01 Dec 2017 | Modified: 01 Dec 2017
Applicable Products
XenServer 7.2
XenServer 7.1 LTSR Cumulative Update 1
XenServer 7.1
XenServer 7.0
XenServer 6.5
XenServer 6.2.0
XenServer 6.0.2
Description of Problem
A number of security vulnerabilities have been identified in Citrix XenServer
that may allow a malicious administrator of an HVM guest VM to compromise the
host.
These vulnerabilities affect all currently supported versions of Citrix
XenServer up to and including Citrix XenServer 7.2.
The following vulnerabilities have been addressed:
CVE-2017-7980: code execution via overflow in Cirrus Logic emulation
CVE-2017-15592: Incorrect handling of self-linear shadow mappings with
translated guests
CVE-2017-17044: Infinite loop due to missing PoD error checking
CVE-2017-17045: Missing p2m error checking in PoD code
Mitigating Factors
Customers without HVM guests (i.e. PV guests only) are not affected by these
issues.
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 7.2: CTX229541 – https://support.citrix.com/article/CTX229541
and CTX230161 – https://support.citrix.com/article/CTX230161
Citrix XenServer 7.1 LTSR CU1: CTX229540 –
https://support.citrix.com/article/CTX229540 and CTX230160 –
https://support.citrix.com/article/CTX230160
Citrix XenServer 7.1 LTSR: CTX229545 –
https://support.citrix.com/article/CTX229545 and CTX230159 –
https://support.citrix.com/article/CTX230159
Citrix XenServer 7.0: CTX229539 – https://support.citrix.com/article/CTX229539
and CTX229544 – https://support.citrix.com/article/CTX229544
Citrix XenServer 6.5 SP1: CTX229543 –
https://support.citrix.com/article/CTX229543
Citrix XenServer 6.2 SP1: CTX229096 –
https://support.citrix.com/article/CTX229096
Citrix XenServer 6.0.2 Common Criteria: CTX229095 –
https://support.citrix.com/article/CTX229095
Customers using the LivePatching feature of Citrix XenServer will not need to
reboot servers to apply this hotfix but HVM guest VMs must either be rebooted
or migrated to a server with the hotfix already applied for the hotfix to be
fully effective.
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/.
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.
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
Changelog
Date Change
1st December 2017 Initial publishing
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