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             AUSCERT External Security Bulletin Redistribution

             Citrix Workspace app for Windows Security Update
                               22 July 2020


        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: 

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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

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


ThelatestLTSRversionof CitrixWorkspaceappfor



Citrix would like to thankCeriCoburn at Pen Test Partnersfor working with us to
protect Citrix customers.


|Date                      |Change                                            |
|2020-07-21                |Initial Publication                               |

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