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Knowledge Base

Security threat with SSL certificates created with MD5 hash (1011704)

Last Updated: 8/16/2011Categories: Total Views: 11681Language:
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Symptoms

If you use SSL certificates generated using MD5 hash on an ESX host, a security scan may report a medium threat because of X.509 Certificate Signature Collision Vulnerability (CVE-2004-2761).

For more information about this threat, see http://www.microsoft.com/technet/security/advisory/961509.mspx.

Note: The preceding link was correct as of June 10, 2009. If you find that the link is broken, please provide feedback and a VMware employee will update the link.

Resolution

Note: Following industry best practices, VMware recommends that you regenerate the SSL Certificates and keys on ESX host according to your company's security policy. In the case of custom certificates, replace these certificates according to your company's security policy.

To resolve this issue, replace SSL certificates generated using MD5 with certificates generated using SHA1 hash.

Replacing self-signed certificates

Log in to the ESX host as root using an SSH client.

Rename the existing public and private keys in /etc/vmware/ssl/ so you have a backup.

Open the script /etc/rc.d/init.d/mgmt-vmware using a text editor.

Locate the the line:

/usr/bin/openssl req -new -x509 -keyout "$sslDir"'/rui.key' \

Change the line to:

/usr/bin/openssl req -new -x509 -sha1 -keyout "$sslDir"'/rui.key' \

Save your changes and exit.

Reboot the ESX host. The certificates are regenerated using SHA1 hash.

Replacing SSL certificated purchased from a Certificate Authority

To replace SSL certificates purchased from a Certificate Authority, contact your SSL certificate vendor and request replacements that are generated using SHA1 hash.

When you have replaced the certificate, reboot the ESX host.

Replacing self-generated (non-self signing) SSL certificates

To replace self-generated SSL certificates, contact your SSL certificate provider and request request replacements that are generated using SHA1 hash.

When you have replaced the certificate, reboot the ESX host.

Related Information

For related information, see Data Security Best Practices - SSL keys for communicating with VirtualCenter and other applications (1008166).

Detectable by VMware SkylineTM

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End Of General Availability of the Free vSphere Hypervisor (ESXi 7.x and 8.x) (2107518)

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在 Windows 客户机上安装 VMware Tools 时报错：系统管理员设置了阻止此安装的策略 (1016563)

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