Zimbra not affected by log4j (CVE-2021-44228)
After intensive review and testing, Zimbra Development determined that the 0-day exploit vulnerability for log4j (CVE-2021-44228) does not affect the current Supported Zimbra versions (9.0.0 & 8.8.15). Zimbra Collaboration Server currently uses log4j1 version 1.2.16 which doesn't contain the lookup expression feature that is found within versions 2.0 to 2.17, which is the cause of the vulnerability. Also, Redhat (CVE-2021-4104) vulnerability does not affect the Zimbra Collaboration Server version (8.8.15 & 9.0.0). For this vulnerability to affect the server, it needs JMSAppender, which the ZCS Server does not use, and the ability to append configuration files.

Intranet sign in

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zimbraNewbie
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Joined: Thu Jan 13, 2022 3:26 am

Intranet sign in

Postby zimbraNewbie » Thu Jan 13, 2022 3:55 am

Hi all,

The place I work hired a contractor to install Zimbra on Centos7 and the project has been delivered.

For reasons unknown to me, certificate configuration and some other things were not included as a deliverable.
So I've come back from leave and had the Zimbra solution handed to me and already there is an issue.

As I said, Zimbra is installed on Centos7, but to administer it I go to the intranet address 'https://ipaddress:7071/zimbraAdmin'.
However, the certificate is not trusted so i get an error on HTTPS (see pic below for details)

The certificate that the browser sees is a self-signed cert which is from the Zimbra server.
I exported that cert and installed it on the local Windows machine I was using, into both the Trusted Root Certification Authority store of the local machine and current user but it still fails.

So I have a feeling that there is more to the configuration then simply importing the cert onto the local machine. Perhaps related to the private key?
I'm not a Linux expert so does anyone know how to get HTTPS working for Zimbra login?

Note: I've searched the forum and also read the installation and admin guide, I can't see any mention of how to do this.

zimbra ssl.png
zimbra ssl.png (54.31 KiB) Viewed 543 times


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JDunphy
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ZCS/ZD Version: 8.8.15_P28 RHEL8 Network Edition
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Re: Intranet sign in

Postby JDunphy » Fri Jan 14, 2022 4:13 pm

Different browsers have different lengths for certificate validation but 1 year is generally the maximum safe acceptable period for most browsers in 2022. Meaning - creating self signed certificates longer than a year can create problems because you will need to know which browsers to use and which ones are moving to even shorter periods. Most of the major browsers will not accept certificates over 1 year in duration without complaining. Reissue your certificate for 1 year and see if that helps.

You can google this yourself what the constraints are for your browser but this came up first from a commercial certificate issuer.

Ref: https://www.godaddy.com/garage/ssl-term-change-2021/

If you want to move to a PKI issued certificate so you don't have to update every browser, you could use a free certificate like letsencrypt which is what many of us do. These forums and wiki's are littered with how to articles on that.

Ref: https://wiki.zimbra.com/wiki/Installing ... ertificate

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