Vulnerability CVE-2021-21991 - CERT Civis.Net

Vulnerability Name:

CVE-2021-21991 (CCN-209752)

Assigned:

2021-09-21

Published:

2021-09-21

Updated:

2022-07-12

Summary:

The vCenter Server contains a local privilege escalation vulnerability due to the way it handles session tokens. A malicious actor with non-administrative user access on vCenter Server host may exploit this issue to escalate privileges to Administrator on the vSphere Client (HTML5) or vCenter Server vSphere Web Client (FLEX/Flash).

CVSS v3 Severity:

7.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Local Attack Complexity (AC): Low Privileges Required (PR): Low User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): High Integrity (I): High Availibility (A): High

8.8 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)
7.7 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Local Attack Complexity (AC): Low Privileges Required (PR): Low User Interaction (UI): None
Scope:	Scope (S): Changed
Impact Metrics:	Confidentiality (C): High Integrity (I): High Availibility (A): High

CVSS v2 Severity:

4.6 Medium (CVSS v2 Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P)

Exploitability Metrics:	Access Vector (AV): Local Access Complexity (AC): Low Authentication (Au): None
Impact Metrics:	Confidentiality (C): Partial Integrity (I): Partial Availibility (A): Partial

6.8 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:C/I:C/A:C)

Exploitability Metrics:	Access Vector (AV): Local Access Complexity (AC): Low Athentication (Au): Single_Instance
Impact Metrics:	Confidentiality (C): Complete Integrity (I): Complete Availibility (A): Complete

Vulnerability Type:

Vulnerability Consequences:

Gain Privileges

References:

Source: MITRE
Type: CNA
CVE-2021-21991

Source: XF
Type: UNKNOWN
vmware-cve202121991-priv-esc(209752)

Source: CCN
Type: IBM Security Bulletin 6507111 (Cloud Pak System)
Multiple Vulnerabilities in VMware vCenter affect IBM Cloud Pak System

Source: CCN
Type: VMware Security Advisory VMSA-2021-0020
VMware vCenter Server updates address multiple security vulnerabilities

Source: MISC
Type: Patch, Vendor Advisory
https://www.vmware.com/security/advisories/VMSA-2021-0020.html

Vulnerable Configuration:

Configuration 1:

cpe:/a:vmware:vcenter_server:6.5:f:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:e:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:d:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:c:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:b:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:a:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:*:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:d:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:b:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:-:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:update1:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:update1b:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:update1c:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:update1d:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:update1e:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:update3:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:update3d:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:update3f:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:update3k:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:update3n:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:-:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:a:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:7.0:-:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:7.0:a:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:7.0:b:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:7.0:c:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:7.0:d:*:*:*:*:*:*

OR cpe:/a:vmware:cloud_foundation:*:*:*:*:*:*:*:* (Version >= 3.0 and < 3.10.2.2)

OR cpe:/a:vmware:cloud_foundation:*:*:*:*:*:*:*:* (Version >= 4.0 and < 4.3)

OR cpe:/a:vmware:vcenter_server:6.5:update1g:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:update2:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:update2b:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:update2c:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:update2d:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:update2g:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.5:update3p:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:update1:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:update1b:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:update2:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:update2a:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:update2c:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:update3:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:update3a:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:update3b:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:update3f:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:update3g:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:update3j:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:update3l:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:update3m:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:update3n:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:7.0:update1:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:7.0:update1a:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:7.0:update1c:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:7.0:update1d:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:7.0:update2:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:7.0:update2a:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:7.0:update2b:*:*:*:*:*:*

Configuration CCN 1:

cpe:/a:vmware:vcenter_server:6.5:*:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:6.7:*:*:*:*:*:*:*

OR cpe:/a:vmware:vcenter_server:7.0:-:*:*:*:*:*:*

AND

cpe:/a:ibm:cloud_pak_system:2.3:*:*:*:*:*:*:*

OR cpe:/a:ibm:cloud_pak_system:2.3.0.1:*:*:*:*:*:*:*

OR cpe:/a:ibm:cloud_pak_system:2.3.1.1:*:*:*:*:*:*:*

OR cpe:/a:ibm:cloud_pak_system:2.3.2.0:*:*:*:*:*:*:*

OR cpe:/a:ibm:cloud_pak_system:2.3.3.0:*:*:*:*:*:*:*

OR cpe:/a:ibm:cloud_pak_system:2.3.3.1:*:*:*:*:*:*:*

OR cpe:/a:ibm:cloud_pak_system:2.3.3.2:*:*:*:*:*:*:*

OR cpe:/a:ibm:cloud_pak_system:2.3.3.3:*:*:*:*:*:*:*

Denotes that component is vulnerable