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AUSCERT External Security Bulletin Redistribution
ESB-2020.3259.2
Citrix Hypervisor Security Update
12 October 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Citrix Hypervisor
Publisher: Citrix
Operating System: Citrix XenServer
Impact/Access: Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-25604 CVE-2020-25603 CVE-2020-25602
CVE-2020-25601 CVE-2020-25600 CVE-2020-25599
CVE-2020-25597 CVE-2020-25596 CVE-2020-25595
Reference: ESB-2020.3251
Original Bulletin:
https://support.citrix.com/article/CTX282314
Revision History: October 12 2020: Hotfix Update
September 24 2020: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Citrix Hypervisor Security Update
Reference: CTX282314
Category : Medium
Created : 23 Sep 2020
Modified : 09 Oct 2020
Applicable Products
o Citrix Hypervisor
o XenServer 7.1
o XenServer 7.0
Description of Problem
Several security issues have been identified in Citrix Hypervisor (formerly
Citrix XenServer) that may allow privileged code in a guest VM to cause the
host to crash or become unresponsive. In addition, unprivileged code in a PV
guest VM may be able to cause that guest VM to crash.
These issues affect all currently supported versions of Citrix Hypervisor up to
and including Citrix Hypervisor 8.2 LTSR.
These issues have the following identifiers:
o CVE-2020-25595
o CVE-2020-25596
o CVE-2020-25597
o CVE-2020-25599
o CVE-2020-25600
o CVE-2020-25601
o CVE-2020-25602
o CVE-2020-25603
o CVE-2020-25604
Mitigating Factors
What Customers Should Do
Citrix has released hotfixes to address these issues. Citrix recommends that
affected customers install these hotfixes as their patching schedule allows.
The hotfixes can be downloaded from the following locations:
Citrix Hypervisor 8.2 LTSR:XS82E007 - https://support.citrix.com/article/
CTX283446
Citrix Hypervisor 8.1:XS81E009 - https://support.citrix.com/article/CTX283445
Citrix XenServer 7.1 LTSR CU2:XS71ECU2047 - https://support.citrix.com/article/
CTX283444
Citrix XenServer 7.0:XS70E083 - https://support.citrix.com/article/CTX283443
A previous version of this bulletin had links to hotfixes that addressed
thesecurityissues but caused stability issues for some deployments that were
using the Hypervisor Introspection (HVI) functionality of Citrix Hypervisor.
Customers who are not using HVI functionality and who have already applied the
earlier updates need take no further action.
Acknowledgements
Changelog
+--------------------------+--------------------------------------------------+
|Date |Change |
+--------------------------+--------------------------------------------------+
|2020-09-22 |Initial Publication |
+--------------------------+--------------------------------------------------+
|2020-10-09 |Hotfix Update |
+--------------------------+--------------------------------------------------+
- --------------------------END INCLUDED TEXT--------------------
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