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AUSCERT External Security Bulletin Redistribution
Citrix Hypervisor Security Update
21 January 2021
AusCERT Security Bulletin Summary
Product: Citrix Hypervisor
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
CVE Names: CVE-2020-29040
Revision History: January 21 2021: Vendor updated with CVE ID
November 25 2020: Initial Release
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Citrix Hypervisor Security Update
Category : Medium
Created : 24 November 2020
Modified : 20 January 2021
o Citrix Hypervisor
Description of Problem
A security issue has been identified that may allow privileged code running in
a guest VM to compromise the host. This issue is limited to only those guest
VMs where the host administrator has explicitly assigned a PCI passthrough
device to the guest VM.
The issue has the following identifier:
CVE ID Description Vulnerability Pre-conditions
CVE-2020-29040 Bounding error CWE-121 A PCI passthrough device
updating physmap must be assigned
This issue affects all currently supported versions of Citrix Hypervisor up to
and including Citrix Hypervisor 8.2 LTSR.
Customers who are not using the PCI passthrough feature of Citrix Hypervisor
are not at risk from this issue
What Customers Should Do
Citrix has released hotfixes to address this issue. 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: CTX286459 - https://support.citrix.com/article/
Citrix Hypervisor 8.1: CTX286458 - https://support.citrix.com/article/CTX286458
Citrix XenServer 7.1 LTSR CU2: CTX286457 - https://support.citrix.com/article/
Citrix XenServer 7.0: CTX286456 - https://support.citrix.com/article/CTX286456
2020-11-24 Initial Publication
2021-01-20 CVE ID Added
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