Information disclosure in VMware ESXi, Fusion, Workstation and Cloud Foundation

1) Heap-based buffer overflow

EUVDB-ID: #VU29303

Risk: Low

CVSSv4.0: 2.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-3971

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

The vulnerability allows a local attacker to gain access to sensitive information on the system.

The vulnerability exists due to a boundary error in the vmxnet3 virtual network adapter. A local attacker can pass specially crafted data to the applicatoin, trigger heap-based buffer overflow and read privileged information contained in hypervisor memory from a virtual machine.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

VMware ESXi: 6.5 - 6.7

VMware Fusion: 11.0.0 - 11.0.1

VMware Workstation: 15.0.0 - 15.0.1

Cloud Foundation: 3.0 - 3.7.1

CPE2.3

• cpe:2.3:o:vmware:vmware_esxi:6.5:*:*:*:*:*:*:*
• cpe:2.3:o:vmware:vmware_esxi:6.7:*:*:*:*:*:*:*
• cpe:2.3:a:vmware:vmware_fusion:11.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:vmware:vmware_fusion:11.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:vmware:vmware_workstation:15.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:vmware:vmware_workstation:15.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:vmware:vmware_cloud_foundation:3.0:*:*:*:*:*:*:*
• cpe:2.3:a:vmware:vmware_cloud_foundation:3.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:vmware:vmware_cloud_foundation:3.0.1.1:*:*:*:*:*:*:*

External links

https://exchange.xforce.ibmcloud.com/vulnerabilities/183925
https://www.vmware.com/security/advisories/VMSA-2020-0015.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.