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VMware Horizon's macOS Client Code Injection

VMware Horizon's macOS Client Code Injection
Posted Jul 12, 2017
Authored by Florian Bogner

VMware Horizon's macOS client versions prior to 4.5 suffer from a code injection vulnerability.

tags | advisory
advisories | CVE-2017-4918
SHA-256 | f66d718ae51d75bdcc8a8fa9026bde7c7516f85ea2777a8579d4c319165f6016

VMware Horizon's macOS Client Code Injection

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CVE-2017-4918: Code Injection in VMware Horizonas macOS Client

Metadata
===================================================
Release Date: 10-July-2017
Author: Florian Bogner // https://bogner.sh
Affected product: VMware Horizonas macOS Client
Fixed in: Version 4.5
Tested on: OS X El Capitan 10.11.6
CVE: CVE-2017-4918
URL: https://bogner.sh/2017/07/cve-2017-4918-code-injection-in-vmware-horizons-macos-client/
Vulnerability Status: Fixed

Product Description
===================================================
VMware Horizon 7 is the leading platform for virtual desktops and applications.
Provide end users access to all of their virtual desktops, applications, and online services through a single digital workspace.

Vulnerability Description
===================================================
An issue within a shell script of VMware Horizon's macOS client could be abused to load arbitrary kernel extensions. In detail, this was possible because a user modifiable environment variable was used to build the command line for a highly privileged command.

Further technical details can be found on my blog: https://bogner.sh/2017/07/cve-2017-4918-code-injection-in-vmware-horizons-macos-client/

Suggested Solution
===================================================
Update to the latest version (fixed in 4.5)

Disclosure Timeline
===================================================
21-04-2017: The issues has been documented and reported
24-04-2017: VMware started investigating
06-06-2017: Fix ready
08-06-2017: Updated Horizon version 4.5 alongside security advisory VMSA-2017-0011 released

Florian Bogner

eMail: florian@bogner.sh
Web: http://www.bogner.sh
LinkedIn: https://www.linkedin.com/profile/view?id=368904276
Xing: https://www.xing.com/profile/Florian_Bogner9
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