ESB-2018.2281 - [Win] VMware Horizon 6, 7, and Horizon Client: Access confidential data - Existing account 2018-08-08

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             AUSCERT External Security Bulletin Redistribution

        VMSA-2018-0019 Horizon 6, 7, and Horizon Client for Windows
            updates address an out-of-bounds read vulnerability
                               8 August 2018


        AusCERT Security Bulletin Summary

Product:           VMware Horizon 6, 7, and Horizon Client
Publisher:         VMware
Operating System:  Windows
Impact/Access:     Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-6970  

Original Bulletin:

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VMware Security Advisories


Horizon 6, 7, and Horizon Client for Windows updates address an out-of-bounds
read vulnerability

VMware Security Advisory

VMware Security Advisory Advisory ID:

VMware Security Advisory Severity:

VMware Security Advisory Synopsis:
Horizon 6, 7, and Horizon Client for Windows updates address an out-of-bounds
read vulnerability

VMware Security Advisory Issue date:

VMware Security Advisory Updated on:
2018-08-07 (Initial Advisory)

VMware Security Advisory CVE numbers:

1. Summary

Horizon 6, 7, and Horizon Client for Windows updates address an out-of-bounds
read vulnerability

2. Relevant Products

  o VMware Horizon 6
  o VMware Horizon 7 
  o VMware Horizon Client for Windows

3. Problem Description

Out-of-bounds read vulnerability in the Message Framework library

Horizon 6, 7, and Horizon Client for Windows contain an out-of-bounds read
vulnerability in the Message Framework library. Successfully exploiting this
issue may allow a less-privileged user to leak information from a privileged
process running on a system where Horizon Connection Server, Horizon Agent or
Horizon Client are installed.

Note: This issue doesn't apply to Horizon 6, 7 Agents installed on Linux
systems or Horizon Clients installed on non-Windows systems.

VMware would like to thank Steven Seeley (mr_me) of Source Incite working with
Trend Micro's Zero Day Initiative for reporting this issue to us.

The Common Vulnerabilities and Exposures project ( has assigned
the identifier CVE-2018-6970 to this issue.

Column 5 of the following table lists the action required to remediate the
vulnerability in each release, if a solution is available.

VMware          Product         Running on  Severity    Replace with/   Mitigation/
Product         Version                                 Apply Patch     Workaround
Horizon 7       7.x.x           Windows     Important   7.5.1           None
Horizon 6       6.x.x           Windows     Important   6.2.7           None
Horizon Client  4.x.x and prior Windows     Important   4.8.1           None

4. Solution

Please review the patch/release notes for your product and version and verify
the checksum of your downloaded file.

VMware Horizon 7 version 7.5.1
Downloads and Documentation:

VMware Horizon 6 version 6.2.7  
Downloads and Documentation:

VMware Horizon Client for Windows 4.8.1
Downloads and Documentation:
5. References

6. Change log

2018-08-07 VMSA-2018-0019 Initial security advisory in conjunction with the
release of VMware Horizon 6 version 6.2.7 and Horizon Client 4.8.1 on

7. Contact

E-mail list for product security notifications and announcements:

This Security Advisory is posted to the following lists:


PGP key at:

VMware Security Advisories

VMware Security Response Policy

VMware Lifecycle Support Phases

VMware Security & Compliance Blog


Copyright 2018 VMware Inc. All rights reserved.

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