VMSA-2019-0014.1

VMware Security Advisories

Advisory ID	VMSA-2019-0014.1
Advisory Severity	Important
CVSSv3 Range	4.7-8.5
Synopsis	VMware ESXi, Workstation, Fusion, VMRC and Horizon Client updates address use-after-free and denial of service vulnerabilities. (CVE-2019-5527, CVE-2019-5535)
Issue Date	2019-09-19
Updated On	2019-09-21
CVE(s)	CVE-2019-5527, CVE-2019-5535

1. Impacted Products

VMware vSphere ESXi (ESXi)
VMware Workstation Pro / Player (Workstation)
VMware Fusion Pro / Fusion (Fusion)
VMware Remote Console for Windows (VMRC for Windows)
VMware Remote Console for Linux (VMRC for Linux)
VMware Horizon Client for Windows
VMware Horizon Client for Linux
VMware Horizon Client for Mac

2. Introduction

VMware ESXi, Workstation, Fusion, VMRC and Horizon Client updates address use-after-free and denial-of-service vulnerabilities.

CVE-2019-5527: ESXi, Workstation, Fusion, VMRC and Horizon Client use-after-free vulnerability
CVE-2019-5535: VMware Workstation and Fusion network denial-of-service vulnerability

3a. ESXi, Workstation, Fusion, VMRC and Horizon Client use-after-free vulnerability - CVE-2019-5527

Description:

ESXi, Workstation, Fusion, VMRC and Horizon Client contain a use-after-free vulnerability in the virtual sound device. VMware has evaluated the severity of this issue to be in the Important severity range with a maximum CVSSv3 base score of 8.5.

Known Attack Vectors:

A local attacker with non-administrative access on the guest machine may exploit this issue to execute code on the host.

Resolution:

To remediate CVE-2019-5527, update/upgrade to the versions listed in the 'Fixed Version' column of the 'Resolution Matrix' found below.

Workarounds:

None.

Additional Documentations:

None.

Notes:

None.

Acknowledgements:

VMware would like to thank Will Dormann of the CERT/CC and wenqunwang from Codesafe Team of Legendsec at Qi'anxin Group for independently reporting this issue to us.

Response Matrix:

Security

Security Advisories

Product	Version	Running On	CVE Identifier	CVSSV3	Severity	Fixed Version	Workarounds	Additional Documents
ESXi	6.7	Any	CVE-2019-5527	8.5	Important	ESXi670-201904101-SG	None	None
ESXi	6.5	Any	CVE-2019-5527	8.5	Important	ESXi650-201903401-SG	None	None
ESXi	6.0	Any	CVE-2019-5527	8.5	Important	ESXi600-201909101-SG	None	None
Workstation	15.x	Any	CVE-2019-5527	8.5	Important	15.5.0	None	None
Fusion	11.x	OS X	CVE-2019-5527	8.5	Important	11.5.0	None	None
VMRC for Windows	10.x	Windows	CVE-2019-5527	8.5	Important	10.0.5 and Later	None	None
VMRC for Linux	10.x	Linux	CVE-2019-5527	8.5	Important	10.0.5 and Later	None	None
Horizon Client for Windows	5.x and prior	Windows	CVE-2019-5527	8.0	Important	5.2.0	None	None
Horizon Client for Linux	5.x and prior	Linux	CVE-2019-5527	8.0	Important	5.2.0	None	None
Horizon Client for Mac	5.x and prior	OS X	CVE-2019-5527	8.0	Important	5.2.0	None	None

3b. VMware Workstation and Fusion network denial-of-service vulnerability - CVE-2019-5535

Description:

VMware Workstation and Fusion contain a network denial-of-service vulnerability due to improper handling of certain IPv6 packets. VMware has evaluated the severity of this issue to be in the Moderate severity range with a maximum CVSSv3 base score of 4.7.

Known Attack Vectors:

An attacker may exploit this issue by sending a specially crafted IPv6 packet from a guest machine on the VMware NAT to disallow network access for all guest machines using VMware NAT mode. This issue can be exploited only if IPv6 mode for VMNAT is enabled.

Resolution:

To remediate CVE-2019-5535, update/upgrade to the versions listed in the 'Fixed Version' column of the 'Resolution Matrix' found below.

Workarounds:

None.

Additional Documentations:

None.

Notes:

IPv6 mode for VMNAT is not enabled by default.

Acknowledgements:

VMware would like to thank Carlos Garcia Prado from FireEye for reporting this issue to us.

Response Matrix:

Product	Version	Running On	CVE Identifier	CVSSV3	Severity	Fixed Version	Workarounds	Additional Documents
Workstation	15.x	Any	CVE-2019-5535	4.7	Moderate	15.5.0	None	None
Fusion	11.x	OS X	CVE-2019-5535	4.7	Moderate	11.5.0	None	None