Multiple vulnerabilities in VMware vCenter Server

Published: 2023-10-25 | Updated: 2024-01-23

Risk	Critical
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2023-34048 CVE-2023-34056
CWE-ID	CWE-787 CWE-284
Exploitation vector	Network
Public exploit	Vulnerability #1 is being exploited in the wild.
Vulnerable software Subscribe	vCenter Server Server applications / Virtualization software
Vendor	VMware, Inc

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Out-of-bounds write

EUVDB-ID: #VU82353

Risk: Critical

CVSSv3.1: 9.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2023-34048

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error within the DCERPC protocol implementation. A remote non-authenticated attacker can send a specially crafted RPC request to the vCenter Server, trigger an out-of-bounds write and execute arbitrary code on the target system.

Note, the vulnerability is being actively exploited in the wild since late 2021.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

vCenter Server: 7.0 U1 - 8.0.0c

External links

http://www.vmware.com/security/advisories/VMSA-2023-0023.html
http://www.zerodayinitiative.com/advisories/ZDI-23-1590/
http://blog.sonicwall.com/en-us/2023/12/vmware-vcenter-dcerpc-dealloc-pointer-manipulation/
http://www.mandiant.com/resources/blog/chinese-vmware-exploitation-since-2021

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.

2) Improper access control

EUVDB-ID: #VU82354

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-34056

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote user to gain unauthorized access to sensitive information.

The vulnerability exists due to improper access restrictions. A remote user can bypass implemented security restrictions and gain unauthorized access to sensitive information.