VMware ESXi and vCenter Server security vulnerabilities (CVE-2021-21972, CVE-2021-21973, CVE-2021-21974)

CVE numbers – CVE-2021-21972, CVE-2021-21973, CVE-2021-21974

Multiple vulnerabilities in VMware ESXi and vSphere Client (HTML5) were privately reported to VMware. Updates are available to remediate these vulnerabilities in affected VMware products.

VMware vCenter Server updates address remote code execution vulnerability in the vSphere Client (CVE-2021-21972)

Description

The vSphere Client (HTML5) contains a remote code execution vulnerability in a vCenter Server plugin. VMware has evaluated the severity of this issue to be in the Critical severity range with a maximum CVSSv3 base score of 9.8.

Known Attack Vectors

A malicious actor with network access to port 443 may exploit this issue to execute commands with unrestricted privileges on the underlying operating system that hosts vCenter Server. 

Resolution

To remediate CVE-2021-21972 apply the updates.

ESXi OpenSLP heap-overflow vulnerability (CVE-2021-21974)

Description

OpenSLP as used in ESXi has a heap-overflow vulnerability. VMware has evaluated the severity of this issue to be in the Important severity range with a maximum CVSSv3 base score of 8.8.

Known Attack Vectors

A malicious actor residing within the same network segment as ESXi who has access to port 427 may be able to trigger the heap-overflow issue in OpenSLP service resulting in remote code execution.

Resolution

To remediate CVE-2021-21974 apply the updates.

VMware vCenter Server updates address SSRF vulnerability in the vSphere Client (CVE-2021-21973)

Description

The vSphere Client (HTML5) contains an SSRF (Server Side Request Forgery) vulnerability due to improper validation of URLs in a vCenter Server plugin. VMware has evaluated the severity of this issue to be in the Moderate severity range with a maximum CVSSv3 base score of 5.3.

Known Attack Vectors

A malicious actor with network access to port 443 may exploit this issue by sending a POST request to vCenter Server plugin leading to information disclosure.

Resolution

To remediate CVE-2021-21973 apply the updates.

Further Information

Further details at https://www.vmware.com/security/advisories/VMSA-2021-0002.html

Duncan Newell

Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.

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