Thanks.

On 9/7/2023 17:09:25, robert k Wild wrote:

Simple answer is no issues at all, I've done it all on the same server and my server has

Postfix, dovecote and roundcube

On Thu, 7 Sept 2023, 22:05 joe a, joea-lists@j4computers.com wrote:

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Any known issues with installing/running roundcube and dovecot on the same server?

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Any known issues with installing/running roundcube and dovecot on the same server?

There is a generic issue with doing this. That is if you have roundcube (or any other web mail interface) on the same server as dovecot, a breach of the web interface could be quite serious and allow access to  the complete mail store.

A better configuration is to run the web mail interface on an isolated server and get it to communicate using TLS imap with a remote dovecot service.

For economy, you could do this on the same machine using a small virtual server to run roundcube

I disagree with this, and that is what user/group/permissions are for.

Roundcube does not have direct file access to the emails even on the same server. Roundcube opens a connection to dovecot, supplies the user/pass/login credentials to dovecot, and dovecot fetches the email stores and serves it to roundcube. There is nothing a hacker can gain access to by exploiting roundcube that they also couldn't get in the same scenario if roundcube and dovecot were on two different machines.

On 2023-09-08, jeremy ardley via dovecot wrote:

The scenario you describe does not consider a breach of the web mail service that allows root access to the file system.

If the web service is compromised to that extent then the mail file store is also compromised.

If the mail file store is on a different device then an exploit has to not only breach the web service on the interface device, it then has to breach the remote store. This will be extremely difficult compared to simply breaching a web server and locally exploiting it.

When the dovecot server is on a remote system and correct firewalls are in place, then the attacker has to breach the imap protocols as well

But if root access is gained on the web server, root access is also gained on roundcube. And mails, the important thing to protect, can be freely read/deleted. At this point root access on the dovecot server does not matter.

On 2023-09-08, jeremy ardley via dovecot wrote:

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The scenario you describe does not consider a breach of the web mail service that allows root access to the file system.

If the web service is compromised to that extent then the mail file store is also compromised.

If the mail file store is on a different device then an exploit has to not only breach the web service on the interface device, it then has to breach the remote store. This will be extremely difficult compared to simply breaching a web server and locally exploiting it.

When the dovecot server is on a remote system and correct firewalls are in place, then the attacker has to breach the imap protocols as well

But if root access is gained on the web server, root access is also gained on roundcube. And mails, the important thing to protect, can be freely read/deleted. At this point root access on the dovecot server does not matter.

Since when does a hacked website gain root? What argument is next, when your storage solution is hacked they have access to your files? Are you not working with linux? How frequent are exploits that give you a root. You can even run the webserver without root, because you only need binding the low port linux capability. So if your webserver process does not even run root, how can it gain it?

A web search on 'linux  web server exploits that gain root' will give many examples.

No, not. And you better get your info for this type of stuff from cve websites or apache vulnerability list.

Security design by first principle assumes that an attacker will gain root access.

I would not know. Logical deduction of the topic question 'when roundcube gets hacked' does not include all this.

The OP is correct with his question. The risk of having an undetected exploit in roundcube code is probably >10000x than something with the webserver software.

Best practise is to limit the damage that can cause. The usual way to limit it is put all public facing systems in a DMZ and have a very carefully controlled access from them to an internal priavte network. The access control is performed by systems that cannot be controlled by a breached public facing server. e.g. router firewalls,.

How does stating something so obvious but irrelevant contribute?

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Since when does a hacked website gain root? What argument is next, when your storage solution is hacked they have access to your files? Are you not working with linux? How frequent are exploits that give you a root.

I was responding to jeremy ardley considering root access gained.

Apart from this privilege escalation is a real threat: https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=privilege+escalation

This link is crap, did you even read a few items on this page? Put then a link to the apache httpd root access.

Fact still remains that nobody here on this list has eternal life nor eternal resources, so you would be stupid to focus on your webserver root access exploit instead of roundcube.

Next to that, it is more common these days to use containers so there is not even a webserver that runs root.

El 8/9/23 a les 0:50, jeremy ardley via dovecot ha escrit:

On 8/9/23 05:00, joe a wrote:

...

Any known issues with installing/running roundcube and dovecot on the same server?

There is a generic issue with doing this. That is if you have roundcube (or any other web mail interface) on the same server as dovecot, a breach of the web interface could be quite serious and allow access to the complete mail store.

A better configuration is to run the web mail interface on an isolated server and get it to communicate using TLS imap with a remote dovecot service.

For economy, you could do this on the same machine using a small virtual server to run roundcube

+1

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Narcis Garcia

I'm using this dedicated address because personal addresses aren't masked enough at this mail public archive. Public archive administrator should fix this against automated addresses collectors.

On 2023-09-08, Robert Senger wrote:

I am running roundcube and dovecot on the same machine. To avoid the described scenario, I have:

1. Enabled and configured selinux on that machine,

yes selinux is a must have

2. Enabled mail-crypt plugin with user keys in dovecot.

This should make it hard for an attacker to get access to the emails even with root access gained through a compromised web server.

mail-crypt is useful if attacker get access to the mails but not to the keys. If you store mails on the same system it's useless

There is a generic issue with doing this. That is if you have roundcube (or any other web mail interface) on the same server as dovecot, a breach of the web interface could be quite serious and allow access to the complete mail store.

No this is crap. user/group is are preventing this. The only risk you have when roundcube is hacked is that any user logging after this hack, his mailbox can be accessed (grabbed userid/passwd). So users not even using this roundcube have no problem at all.