VMware published an advisory addressing 19 vulnerabilities, including one critical flaw in vCenter Server that is reportedly simple to exploit. Background On September 21, VMware published a security advisory addressing 19 vulnerabilities in vCenter Server, its centralized management software for VMware vSphere systems. The full list of vulnerabilities patched includes:

CVE-2021-22005: Critical File Upload Vulnerability in VMware vCenter Server

The vCenter Server contains an arbitrary file upload vulnerability in the Analytics service. A malicious actor with network access to port 443 on vCenter Server may exploit this issue to execute code on vCenter Server by uploading a specially crafted file.

An arbitrary file upload vulnerability exists in vCenter Server. An unauthenticated, remote attacker with network access to port 443 on vCenter Server may exploit this issue to execute code on vCenter Server by uploading a specially crafted file.

The version of VMware vCenter Server installed on the remote host is 7.0 prior to 7.0 U2c. It is, therefore, affected  by multiple vulnerabilities:

    - An arbitrary file upload vulnerability exists in the analytics service of vSphere Server. An       unauthenticated, remote attacker can exploit this to upload arbitrary files on the remote host       and execute code using a specially crafted file. (CVE-2021-22005)

    - A privilege escalation vulnerability exists in vCenter Server due to the way it handles session tokens.       An authenticated, local attacker can exploit this to gain unauthorized access to the system.       (CVE-2021-21991, CVE-2021-22015)

    - A reverse proxy bypass vulnerability exists in vCenter Server due to the way the endpoints handle the URI.       An unauthenticated, remote attacker can exploit this to gain unauthorized access to restricted endpoints.
      (CVE-2021-22006) 

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version   number. Nessus has also not tested for the presence of a workaround.

The version of VMware vCenter Server installed on the remote host is 6.7 prior to 6.7 U3o. It is, therefore, affected by multiple vulnerabilities:

    - A privilege escalation vulnerability exists in vCenter Server due to the way it handles session tokens.       An authenticated, local attacker can exploit this to gain unauthorized access to the system.       (CVE-2021-21991, CVE-2021-22015)

    - A reverse proxy bypass vulnerability exists in vCenter Server due to the way the endpoints handle the URI.       An unauthenticated, remote attacker can exploit this to gain unauthorized access to restricted endpoints.
      (CVE-2021-22006) 

    - An rhttproxy bypass vulnerability exists in vCenter Server due to improper implementation of URI       normalization. An unauthenticated, remote attacker can exploit this to gain access to internal       endpoints. (CVE-2021-22017)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version   number. Nessus has also not tested for the presence of a workaround.

ID	Name	Product	Family	Severity
153889	VMware vCenter Server Arbitrary File Upload (VMSA-2021-0020)	Nessus	Misc.	critical
153545	VMware vCenter Server < 7.0 U2c Multiple Vulnerabilities (VMSA-2021-0020)	Nessus	Misc.	critical
153544	VMware vCenter Server < 6.7 Multiple Vulnerabilities (VMSA-2021-0020)	Nessus	Misc.	critical

Detections

Analytics

CVE-2021-22005

critical

Tenable Plugins

critical

critical

critical