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Knowledge Base

Ciphers supported on ESX/ESXi and vCenter Server (1018510)

Last Updated: 8/6/2021Categories: InformationalTotal Views: 22865Language:
Chinese (Simplified)JapaneseEnglish

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Details

Weak ciphers are defined based on the number of bits and techniques used for encryption. To detect supported ciphers on a specific port on ESX/ESXi hosts or on vCenter Server/vCenter Server Appliances, you can use certain open source tools such as OpenSSL by running the openssl s_client -cipher LOW -connect hostname:port command. In addition, you can use vulnerability scanners like Nessus to check SSL services on arbitrary ports.

Weak SSL encryption is detected on ESX/ESXi versions 4.0.x, 4.1 and ESXi version 5.x. However, by default both the vCenter Server and ESX hosts select the highest grade SSL or TLS cipher supported, for example, AES256-SHA.

Weak ciphers in VMware environments that result in the following situations:

A security scan of VMware environment shows that weak SSL ciphers are detected.

ESX or ESXi hosts fail a PCI scan due to weak ciphers being enabled.

An audit of VMware environment discovers that the Virtual Center service supports a number of weak SSL ciphers.

Nessus scans identify ESX hosts as supporting weak SSL ciphers.

Solution

The following tables list the supported ciphers and their ports on ESX/ESXi and vCenter Server. These ciphers are based off of the VMware-built OpenSSL package that is shipped with vCenter Server (C:\Program Files\VMware\vCenter Server\openSSL\openssl.exe in vSphere 6.0), vCenter Server Appliance (/usr/lib/vmware-openSSL/openssl in vSphere 6.0), and ESXi (/bin/openssl). VMware does not leverage the OpenSSL package shipped natively with SLES, and does not support individual cipher disablement with the below products.

ESX/ESXi

Supported Ciphers

RC4-MD5

RC4-SHA

AES128-SHA

DES-CBC3-SHA

Suite B 1,2

Port 443

ESX 4.0

Supported

Supported

Supported

Supported

Not Supported

ESX 4.0 Update

Supported

Supported

Supported

Supported

Not Supported

ESX 4.1

Supported

Supported

Supported

Supported

Not Supported

ESXi 5.x

Not Supported

Not Supported

Supported

Supported

Supported 2

ESXi 6.0

Not Supported

Not Supported

Supported

Not Supported

Supported 2

ESXi 6.5

Not Supported

Not Supported

Supported

Not Supported

Supported 2

ESXi 6.7

Not Supported

Not Supported

Supported

Not Supported

Supported 2

vCenter Server

Supported Ciphers

RC4-MD5

RC4-SHA

DES-CBC3-SHA

AES128-SHA

EDH-RSA-DES-CBC3-SHA

Suite B 1,2

Port 443

vCenter Server 4.0

Supported

Supported

Supported

Supported

Supported

Not Supported

vCenter Server 4.0 Update

Supported

Supported

Supported

Supported

Supported

Not Supported

vCenter Server 4.1

Supported

Supported

Supported

Supported

Supported

Not Supported

vCenter Server 5.x

Not Supported

Not Supported

Supported

Supported

Not Supported

Not Supported

vCenter Server 6.0

Not Supported

Not Supported

Not Supported

Supported

Not Supported

Supported 2

vCenter Server 6.5

Not Supported

Not Supported

Not Supported

Supported

Not Supported

Supported 2

vCenter Server 6.7

Not Supported

Not Supported

Not Supported

Supported

Not Supported

Supported 2

Port 9087 and 8443

vCenter Server 4.0

Supported

Supported

Supported

Not Supported

Supported

Not Supported

vCenter Server 4.0 Update

Supported

Supported

Supported

Not Supported

Supported

Not Supported

vCenter Server 4.1

Supported

Supported

Supported

Not Supported

Supported

Not Supported

Port 9443

vCenter Server 5.1

Not Supported

Not Supported

Supported

Supported

Supported

Not Supported

vCenter Server 5.5

Not Supported

Not Supported

Supported

Supported

Supported

Not Supported

vCenter Server 6.0

Not Supported

Not Supported

Not Supported

Supported

Not Supported

Supported 2

vCenter Server 6.5

Not Supported

Not Supported

Not Supported

Supported

Not Supported

Supported 2

vCenter Server 6.7

Not Supported

Not Supported

Not Supported

Supported

Not Supported

Supported 2

Notes:

For more information about cipher Suite B, see the National Security Agency article Suite B Cryptography and NSA Suite B Cryptography.

The Suite B cipher suite includes: ECDHE-RSA-AES128-GCM-SHA256; ECDHE-ECDSA-AES128-GCM-SHA256; ECDHE-RSA-AES128-SHA256; ECDHE-ECDSA-AES128-SHA256; ECDHE-RSA-AES128-SHA; ECDHE-ECDSA-AES128-SHA; DHE-DSS-AES128-GCM-SHA256; DHE-RSA-AES128-GCM-SHA256; ECDH-RSA-AES128-GCM-SHA256; ECDH-ECDSA-AES128-GCM-SHA256; ECDH-RSA-AES128-SHA256; ECDH-ECDSA-AES128-SHA256; ECDH-RSA-AES128-SHA; ECDH-ECDSA-AES128-SHA; AES128-GCM-SHA256; AES128-SHA256; ECDHE-RSA-AES256-GCM-SHA384; ECDHE-ECDSA-AES256-GCM-SHA384; ECDHE-RSA-AES256-SHA384; ECDHE-ECDSA-AES256-SHA384; ECDHE-RSA-AES256-SHA; ECDHE-ECDSA-AES256-SHA; ECDH-RSA-AES256-GCM-SHA384; ECDH-ECDSA-AES256-GCM-SHA384; ECDH-RSA-AES256-SHA384; ECDH-ECDSA-AES256-SHA384; ECDH-RSA-AES256-SHA; ECDH-ECDSA-AES256-SHA; AES256-GCM-SHA384; AES256-SHA256

For related information, see VirtualCenter Server 2.5 Update 4 and later uses high-security SSL ciphers (1009408)vv and ESXi 5.0 disables nonsecure ciphers in Internet Explorer 6 (2003464).

For vSphere 7.0 information, see VMware vSphere 7.0 Default SSL/TLS Cipher Suites

Ensure weak SSL encryption is not detected

The best practices to mitigate the risk of weak SSL encryption being detected on ESX 3.0.x, 4.0.x, 4.1 as well as ESXi 4.1, 5.x and 6.0 are:

Ensure that ESX hosts are not directly accessible by Internet and are protected by firewalls.

Ensure that browsers are configured to not use weak ciphers to connect with ESX/ESXi hosts.

Additional Information

For translated versions of this article, see:

日本語: ESX/ESXi および vCenter Server でサポートされる暗号 (2097063)

简体中文: ESX/ESXi 和 vCenter Server 上支持的密码 (2102396)

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