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VMware Patches Six Vulnerabilities in Various Products

VMware this week patched code execution, command injection, information disclosure and denial-of-service (DoS) vulnerabilities in its ESXi, vCenter Server, Workstation, Fusion, VMRC and Horizon Client products.

On Monday, the company announced the availability of patches for a total of four vulnerabilities affecting ESXi and vCenter Server. The most serious of them appear to be CVE-2019-5532 and CVE-2019-5534, high-severity information disclosure issues affecting vCenter Server.

Reported to VMware by Rich Browne of F5 Networks and Ola Beyioku, the flaws, classified by the company as “important,” are related to Open Virtualization Format (OVF) virtual machines and they can allow a malicious user to gain access to the credentials used to deploy the OVF. These credentials are typically for the root account of the virtual machine.

VMware also told users on Monday that patches are available for a Busybox command injection vulnerability affecting ESXi, which allows an attacker to trick an admin into executing shell commands by providing them a malicious file.

The virtualization giant also addressed an issue in ESXi and vCenter Server vSphere that allows a local or a man-in-the-middle (MitM) attacker to gain control of a VM console after a user has logged out or their session has timed out.

A separate advisory published by VMware on Thursday describes two vulnerabilities. One of them, CVE-2019-5527, is a high-severity issue related to the virtual sound device used by ESXi, Workstation, Fusion, VMRC and Horizon Client. This component is affected by a use-after-free bug that can be exploited by a local attacker with non-admin access to the guest machine to execute arbitrary code on the host.

This vulnerability, which can only be exploited if a valid sound backend is not connected, was independently reported to VMware by Will Dormann of CERT/CC and wenqunwang from the 360 Codesafe Team at Legendsec.

The second vulnerability, classified as “moderate,” affects Workstation on any platform and Fusion on macOS, and it can be exploited to cause a network DoS condition by sending specially crafted IPv6 packets from a guest machine to the VMware Network Address Translation (NAT) system.

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Eduard Kovacs (@EduardKovacs) is a contributing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.