VMSA-2023-0023:VMware vCenter Server updates address out-of-bounds write and information disclosure vulnerabilities

VMware Tanzu Application Service

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23677

15 January 2024

23 October 2023

CLOSED

CRITICAL

4.3-9.8

CVE-2023-34048,CVE-2023-34056

VMSA-2023-0023.1
4.3-9.8
2023-10-25
2024-01-17
CVE-2023-34048, CVE-2023-34056
VMware vCenter Server updates address out-of-bounds write and information disclosure vulnerabilities (CVE-2023-34048, CVE-2023-34056)
1. Impacted Products
  • VMware vCenter Server
  • VMware Cloud Foundation
2. Introduction

An out-of-bounds write (CVE-2023-34048) and a partial information disclosure (CVE-2023-34056) in vCenter Server were responsibly reported to VMware. Updates are available to remediate these vulnerabilities in affected VMware products.

3a. VMware vCenter Server Out-of-Bounds Write Vulnerability (CVE-2023-34048)

Description

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 Critical severity range with a maximum CVSSv3 base score of 9.8.

Known Attack Vectors

A malicious actor with network access to vCenter Server may trigger an out-of-bounds write potentially leading to remote code execution.

Resolution

To remediate CVE-2023-34048 apply the updates listed in the 'Fixed Version' column of the 'Response Matrix' below to affected deployments.

Workarounds

In-product workarounds were investigated, but were determined to not be viable.

Additional Documentation

A supplemental FAQ was created for additional clarification. Please see: https://via.vmw.com/vmsa-2023-0023-qna

Notes

  • While VMware does not mention end-of-life products in VMware Security Advisories, due to the critical severity of this vulnerability and lack of workaround VMware has made a patch generally available for vCenter Server 6.7U3, 6.5U3, and VCF 3.x. For the same reasons, VMware has made additional patches available for vCenter Server 8.0U1.
  • Async vCenter Server patches for VCF 5.x and 4.x deployments have been made available. Please see KB88287 for more information.
  • VMware has confirmed that exploitation of CVE-2023-34048 has occurred in the wild.

Acknowledgements

VMware would like to thank Grigory Dorodnov of Trend Micro Zero Day Initiative for reporting this issue to us.

3b. VMware vCenter Server Partial Information Disclosure Vulnerability (CVE-2023-34056)

Description

vCenter Server contains a partial information disclosure vulnerability. VMware has evaluated the severity of this issue to be in the Moderate severity range with a maximum CVSSv3 base score of 4.3.

Known Attack Vectors

A malicious actor with non-administrative privileges to vCenter Server may leverage this issue to access unauthorized data.

Resolution

To remediate CVE-2023-34056 apply the updates listed in the 'Fixed Version' column of the 'Response Matrix' below to affected deployments.

Workarounds

None.

Additional Documentation

None.

Acknowledgements

VMware would like to thank Oleg Moshkov of Deiteriy Lab OÜ for reporting this issue to us.

Response Matrix

Product Version Running On CVE Identifier CVSSv3 Severity Fixed Version Workarounds Additional Documentation
VMware vCenter Server
8.0
Any
CVE-2023-34048, CVE-2023-34056
9.8, 4.3
critical
None
VMware vCenter Server
8.0
Any
CVE-2023-34048
9.8
critical
None
VMware vCenter Server
7.0
Any
CVE-2023-34048, CVE-2023-34056
9.8, 4.3
critical
None
VMware Cloud Foundation (VMware vCenter Server)
5.x, 4.x
Any
CVE-2023-34048, CVE-2023-34056
9.8, 4.3
critical
None
4. References
5. Change Log

2023-10-25 VMSA-2023-0023
Initial security advisory.

2024-01-17 VMSA-2023-0023.1
Updated advisory to note that VMware has confirmed that exploitation of CVE-2023-34048 has occurred in the wild.

6. Contact

E-mail: [email protected]

PGP key at:
https://kb.vmware.com/kb/1055 

VMware Security Advisories
https://www.vmware.com/security/advisories 

VMware Security Response Policy
https://www.vmware.com/support/policies/security_response.html 

VMware Lifecycle Support Phases
https://www.vmware.com/support/policies/lifecycle.html 

VMware Security & Compliance Blog  
https://blogs.vmware.com/security 

Twitter
https://twitter.com/VMwareSRC

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