Excluding RC4 ciphers still shows up in a TLS scan

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Article Information

This article applies to the following ZCS versions.

ZCS 8.6 Article ZCS 8.6 ZCS 8.5 Article ZCS 8.5 ZCS 8.0 Article ZCS 8.0


Excluding RC4 ciphers still shows up in a TLS scan

Purpose

Excluding RC4 ciphers still shows up in a TLS scan.

Resolution

For RC4, we have to specify the 'SSL' ciphers in the exclude list as well:

zmprov mcf +zimbraSSLExcludeCipherSuites SSL_RSA_WITH_RC4_128_MD5
zmprov mcf +zimbraSSLExcludeCipherSuites SSL_RSA_WITH_RC4_128_SHA
zmprov mcf +zimbraSSLExcludeCipherSuites SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA
zmmailboxdctl restart

The only change made is that 'TLS' has been replaced with 'SSL' for these specific cipher suites.

Additional Content

  • For detailed explanations of and Ciphers and Security, please visit the official [Wiki page].
Verified Against: Zimbra Collaboration 8.6, 8.5, 8.0 Date Created: 05/28/2015
Article ID: https://wiki.zimbra.com/index.php?title=Excluding_RC4_ciphers_still_shows_up_in_a_TLS_scan Date Modified: 2015-06-15



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Wiki/KB reviewed by SME1 SME2 Copyeditor Last edit by Jorge de la Cruz
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