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             AUSCERT External Security Bulletin Redistribution

              Citrix XenMobile 10.x Multiple Security Updates
                                28 May 2018


        AusCERT Security Bulletin Summary

Product:           Citrix XenMobile Server
Publisher:         Citrix
Operating System:  Windows
                   Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated      
                   Create Arbitrary Files          -- Remote/Unauthenticated      
                   Denial of Service               -- Remote/Unauthenticated      
                   Cross-site Scripting            -- Remote with User Interaction
                   Provide Misleading Information  -- Remote with User Interaction
                   Access Confidential Data        -- Remote/Unauthenticated      
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-10654 CVE-2018-10653 CVE-2018-10652
                   CVE-2018-10651 CVE-2018-10650 CVE-2018-10649

Original Bulletin: 

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Citrix XenMobile 10.x Multiple Security Updates

Security Bulletin | High
| Created: 21 May 2018 | Modified: 21 May 2018

Applicable Products

  * XenMobile 10.7
  * XenMobile 10.8

Description of Problem

A number of security vulnerabilities have been identified in Citrix XenMobile
Server.  The vulnerabilities have been assigned the following CVE numbers.

Affecting XenMobile Server 10.7 and 10.8:

  * CVE-2018-10653 (High): XML External Entity (XXE) Processing Vulnerability
    in Citrix XenMobile Server
  * CVE-2018-10650 (Medium): Insufficient Path Validation Vulnerability in
    Citrix XenMobile Server
  * CVE-2018-10654 (Medium): Hazelcast Library Java Deserialization
    Vulnerability in Citrix XenMobile Server
  * CVE-2018-10648 (Low): Unauthenticated File Upload Vulnerabilities in Citrix
    XenMobile Server
  * CVE-2018-10651 (Low): Open Redirect Vulnerabilities in Citrix XenMobile

Affecting XenMobile Server 10.7:

  * CVE-2018-10649 (Medium): Cross-Site Scripting Vulnerability in Citrix
    XenMobile Server
  * CVE-2018-10652 (Medium): Sensitive Data Leakage in Citrix XenMobile Server


These issues have already been addressed in the Citrix Cloud service.

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Mitigating Factors

CVE-2018-10650 (Medium): Insufficient Path Validation Vulnerability in Citrix
XenMobile Server

A compromised or malicious XenMobile Server administrator session is required
in order to exploit this vulnerability.


CVE-2018-10654 (Medium): Hazelcast Library Java Deserialization Vulnerability
in Citrix XenMobile Server

This issue is only exposed if XenMobile Clustering has been enabled.

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What Customers Should Do

These vulnerabilities have been addressed with the exception of CVE-2018-10654
in new versions of Citrix XenMobile Server.

Citrix recommends that customers upgrade Citrix XenMobile 10.8 to Rolling Patch
2 found at https://support.citrix.com/article/CTX234866 and Citrix XenMobile
10.7 to Rolling Patch 3 found at https://support.citrix.com/article/CTX234867.

Customers using XenMobile Clustering should mitigate CVE-2018-10654 by ensuring
that port 45000 on the XenMobile Server nodes is not reachable from
untrustworthy traffic.  Port 45000 should only be accessible between XenMobile
Server nodes.  See https://docs.citrix.com/en-us/xenmobile/server/

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Citrix thanks the following for working with us to protect Citrix customers:

  * Glyn Wintle and Harry Metcalfe of DXW Cyber (https://www.dxwcyber.com/)

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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/.

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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. 

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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

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|Date                        |Change                                          |
|21 May 2018                 |Initial publication                             |

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