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AUSCERT External Security Bulletin Redistribution
ESB-2020.2479
Citrix Workspace app for Windows Security Update
22 July 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Citrix Workspace app for Windows
Publisher: Citrix
Operating System: Windows
Impact/Access: Increased Privileges -- Existing Account
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-8207
Original Bulletin:
https://support.citrix.com/article/CTX277662
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Citrix Workspace app for Windows Security Update
Reference: CTX277662
Category : High
Created : 21 Jul 2020
Modified : 21 Jul 2020
Applicable Products
o Citrix Workspace App
Description of Problem
A vulnerabilityhasbeen identified inthe automatic update service ofCitrix
Workspace app for Windows that could result in:
o Alocal user escalating their privilege level to that of an administratoron
the computer running Citrix Workspace app for Windows.
o Aremote compromise of thecomputer running Citrix Workspace app when Windows
file sharing (SMB) is enabled.
The issue has the following identifier:
o CVE-2020-8207
This vulnerability affectsthe followingsupported versions of Citrix Workspace
app for Windows:
o Citrix Workspaceappfor Windows1912 LTSR
o Citrix Workspaceappfor Windows2002
This vulnerabilitydoesnot affect Citrix Workspace appon any other platforms
orany supported versions of CitrixReceiver.
Mitigating Factors
This vulnerability onlyexistsifCitrix Workspace app was installedusing an
accountwithlocal or domainadministratorprivileges.It does not existwhena
standard Windows user installed Citrix Workspace app for Windows.
A remote compromise is only possible when the user has enabled Windows file
sharing (SMB)and only when the updater service is running.If authentication is
required forSMBthen an attackermustbe able toauthenticate before
theycouldexploit this issue.
Users with automatic updates enabled and applied should havealready beenupdated
toafixedversion.
What Customers Should Do
The issue has been addressed in the following versions of Citrix Workspace app
for Windows:
o Citrix Workspace App 2006.1 or later
o Citrix Workspace App 1912 LTSR CU1and later cumulative updates
Citrix strongly recommends that customers checkifthe versionthey are runninghas
been automatically updated and, if necessary, upgradeto a fixed version as soon
as possible.
Thelatestversion ofCitrixWorkspaceappfor
WindowsisavailablefromthefollowingCitrixwebsitelocation:
https://www.citrix.com/downloads/workspace-app/windows/
ThelatestLTSRversionof CitrixWorkspaceappfor
WindowsisavailablefromthefollowingCitrixwebsitelocation:
https://www.citrix.com/downloads/workspace-app/
workspace-app-for-windows-long-term-service-release/
Acknowledgements
Citrix would like to thankCeriCoburn at Pen Test Partnersfor working with us to
protect Citrix customers.
Changelog
+--------------------------+--------------------------------------------------+
|Date |Change |
+--------------------------+--------------------------------------------------+
|2020-07-21 |Initial Publication |
+--------------------------+--------------------------------------------------+
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