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CVE-2017-4918: Code Injection in VMware Horizon’s macOS Client

CVE-2017-4918: Code Injection in VMware Horizon’s macOS Client

Release Date: 10-July-2017
Author: Florian Bogner // https://bogner.sh
Affected product: VMware Horizon‘s 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@xxxxxxxxx
Web: http://www.bogner.sh
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