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Important

Advisory ID: VMSA-2023-0014
CVSSv3 Range: 5.9 - 8.1
Issue Date: 2023-06-22
Updated On: 2023-06-22 (Initial Advisory)
CVE(s): CVE-2023-20892, CVE-2023-20893, CVE-2023-20894, CVE-2023-20895,
CVE-2023-20896
Synopsis: VMware vCenter Server updates address multiple memory corruption
vulnerabilities (CVE-2023-20892, CVE-2023-20893, CVE-2023-20894, CVE-2023-20895,
CVE-2023-20896)

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1. IMPACTED PRODUCTS

 * VMware vCenter Server (vCenter Server)
 * VMware Cloud Foundation (Cloud Foundation)

2. INTRODUCTION

Multiple memory corruption vulnerabilities in VMware vCenter Server were
privately reported to VMware. Updates are available to remediate these
vulnerabilities in affected VMware products.

3A. VMWARE VCENTER SERVER HEAP-OVERFLOW VULNERABILITY (CVE-2023-20892)

Description:
The vCenter Server contains a heap overflow vulnerability due to the usage of
uninitialized memory in the implementation of the DCERPC protocol. VMware has
evaluated the severity of this issue to be in the Important severity range with
a maximum CVSSv3 base score of 8.1.

Known Attack Vectors:
A malicious actor with network access to vCenter Server may exploit this issue
to execute arbitrary code on the underlying operating system that hosts vCenter
Server.


Resolution:
To remediate CVE-2023-20892 apply the updates listed in the 'Fixed Version'
column of the 'Response Matrix' below to affected deployments.

Workarounds:
None.

Additional Documentation:
Async patches for vCenter Servers have been made available for VCF customers.
Please see knowledge base article 88287 for more information.
A supplemental FAQ was created for additional clarification. Please see:
https://via.vmw.com/vmsa-2023-0014-qna.


Acknowledgments:
VMware would like to thank Aleksandar Nikolic of Cisco for reporting this issue
to us.

Notes:
None.

3b. VMware vCenter Server use-after-free vulnerability (CVE-2023-20893)


Description:
The vCenter Server contains a use-after-free vulnerability in the implementation
of the DCERPC protocol. VMware has evaluated the severity of this issue to be in
the Important severity range with a maximum CVSSv3 base score of 8.1.

Known Attack Vectors:
A malicious actor with network access to vCenter Server may exploit this issue
to execute arbitrary code on the underlying operating system that hosts vCenter
Server.


Resolution:
To remediate CVE-2023-20893 apply the updates listed in the 'Fixed Version'
column of the 'Response Matrix' below to affected deployments.

Workarounds:
None.

Additional Documentation:
Async patches for vCenter Servers have been made available for VCF customers.
Please see knowledge base article 88287 for more information.
A supplemental FAQ was created for additional clarification. Please see:
https://via.vmw.com/vmsa-2023-0014-qna.


Acknowledgments:
VMware would like to thank Dimitrios Tatsis of Cisco Talos for reporting this
issue to us.

Notes:
None.

3c. VMware vCenter Server out-of-bounds write vulnerability (CVE-2023-20894)


Description:
The vCenter Server contains an out-of-bounds write vulnerability in the
implementation of the DCERPC protocol. VMware has evaluated the severity of this
issue to be in the Important severity range with a maximum CVSSv3 base score of
8.1.

Known Attack Vectors:
A malicious actor with network access to vCenter Server may trigger an
out-of-bound write by sending a specially crafted packet leading to memory
corruption.


Resolution:
To remediate CVE-2023-20894 apply the updates listed in the 'Fixed Version'
column of the 'Response Matrix' below to affected deployments.

Workarounds:
None.

Additional Documentation:
Async patches for vCenter Servers have been made available for VCF customers.
Please see knowledge base article 88287 for more information.
A supplemental FAQ was created for additional clarification. Please see:
https://via.vmw.com/vmsa-2023-0014-qna.


Acknowledgments:
VMware would like to thank Dimitrios Tatsis of Cisco Talos for reporting this
issue to us.

Notes:
None.

3d. VMware vCenter Server out-of-bounds read vulnerability (CVE-2023-20895)


Description:
The vCenter Server contains a memory corruption vulnerability in the
implementation of the DCERPC protocol. VMware has evaluated the severity of this
issue to be in the Important severity range with a maximum CVSSv3 base score of
8.1


Known Attack Vectors:
A malicious actor with network access to vCenter Server may trigger a memory
corruption vulnerability which may bypass authentication.

Resolution:
To remediate CVE-2023-20895 apply the updates listed in the 'Fixed Version'
column of the 'Response Matrix' below to affected deployments.

Workarounds:
None.

Additional Documentation:
Async patches for vCenter Servers have been made available for VCF customers.
Please see knowledge base article 88287 for more information.
A supplemental FAQ was created for additional clarification. Please see:
https://via.vmw.com/vmsa-2023-0014-qna.


Acknowledgments:
VMware would like to thank Dimitrios Tatsis of Cisco Talos for reporting this
issue to us.

Notes:
None.

3e. VMware vCenter Server out-of-bounds read vulnerability (CVE-2023-20896)


Description:
The vCenter Server contains an out-of-bounds read vulnerability in the
implementation of the DCERPC protocol. VMware has evaluated the severity of this
issue to be in the Moderate severity range with a maximum CVSSv3 base score of
5.9.

Known Attack Vectors:
A malicious actor with network access to vCenter Server may trigger an
out-of-bounds read by sending a specially crafted packet leading to
denial-of-service of certain services (vmcad, vmdird, and vmafdd).


Resolution:
To remediate CVE-2023-20896 apply the updates listed in the 'Fixed Version'
column of the 'Response Matrix' below to affected deployments.

Workarounds:
None.

Additional Documentation:
Async patches for vCenter Servers have been made available for VCF customers.
Please see knowledge base article 88287 for more information.
A supplemental FAQ was created for additional clarification. Please see:
https://via.vmw.com/vmsa-2023-0014-qna.


Acknowledgments:
VMware would like to thank Dimitrios Tatsis and Aleksandar Nikolic of Cisco
Talos for reporting this issue to us.

Notes:
None.

Response Matrix

Product Version Running On CVE Identifier CVSSv3 Severity Fixed Version
Workarounds Additional Documentation
vCenter Server
8.0
Any
CVE-2023-20892 CVE-2023-20893 CVE-2023-20894 CVE-2023-20895
8.1
important
8.0 U1b
None
None
vCenter Server
8.0
Any
CVE-2023-20896
5.9
moderate
8.0 U1b
None
None
vCenter Server
7.0
Any
CVE-2023-20892 CVE-2023-20893 CVE-2023-20894 CVE-2023-20895
8.1
important
7.0 U3m
None
None
vCenter Server
7.0
Any
CVE-2023-20896
5.9
moderate
7.0 U3m
None
None
Cloud Foundation (vCenter Server)
5.x
Any
CVE-2023-20892 CVE-2023-20893 CVE-2023-20894 CVE-2023-20895
8.1
important
8.0 U1b
None
KB88287
Cloud Foundation (vCenter Server)
5.x
Any
CVE-2023-20896
5.9
moderate
8.0 U1b
None
KB88287
Cloud Foundation (vCenter Server)
4.x
Any
CVE-2023-20892 CVE-2023-20893 CVE-2023-20894 CVE-2023-20895
8.1
important
7.0 U3m
None
KB88287
Cloud Foundation (vCenter Server)
4.x
Any
CVE-2023-20896
5.9
moderate
7.0 U3m
None
KB88287

4. REFERENCES

Fixed Version(s) and Release Notes:

VMware vCenter Server 8.0 U1b
Downloads and Documentation:
https://docs.vmware.com/en/VMware-vSphere/8.0/rn/vsphere-vcenter-server-80u1b-release-notes/index.html

VMware vCenter Server 7.0 U3m
Downloads and Documentation:
https://docs.vmware.com/en/VMware-vSphere/7.0/rn/vsphere-vcenter-server-70u3m-release-notes/index.html



KB Articles:
Cloud Foundation 4.x/5.x:
https://kb.vmware.com/s/article/88287



Mitre CVE Dictionary Links:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20892
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20893
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20894
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20895
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20896

FIRST CVSSv3 Calculator:
CVE-2023-20892:
https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVE-2023-20893:
https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVE-2023-20894:
https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVE-2023-20895:
https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVE-2023-20896:
https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H


5. CHANGE LOG

2023-06-22 VMSA-2023-0014
Initial security advisory.



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E-mail: security@vmware.com

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https://kb.vmware.com/kb/1055

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