Bug 487124 - No server certificate verification method has been enabled
No server certificate verification method has been enabled
Product: Fedora
Classification: Fedora
Component: NetworkManager-openvpn (Show other bugs)
All Linux
low Severity medium
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Assigned To: Huzaifa S. Sidhpurwala
Fedora Extras Quality Assurance
Depends On:
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Reported: 2009-02-24 06:43 EST by Jens Liebchen
Modified: 2010-03-19 03:28 EDT (History)
4 users (show)

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Doc Type: Bug Fix
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Last Closed: 2010-03-19 03:28:01 EDT
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Description Jens Liebchen 2009-02-24 06:43:53 EST
NetworkManager-openvpn does not check the server certificate. It is not possible to configure NetworkManager-openvpn to do so.


To reproduce, you have to connect via NetworkManager-openvpn to a VPN with certificates authorization. You will find the following information in /var/log/messages:

nm-openvpn[3916]: WARNING: No server certificate verification method has been enabled.  See http://openvpn.net/howto.html#mitm for more info.

Easiest fix should be using the option "remote-cert-tls server" when starting openvpn. See the link above above for more info.

The risk of this issue is, that a compromised client with a CA-signed certificate can fake being the server and do a MITM attack against other clients.
Comment 1 Bug Zapper 2009-06-09 07:36:42 EDT
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle.
Changing version to '11'.

More information and reason for this action is here:
Comment 2 Huzaifa S. Sidhpurwala 2010-03-19 03:28:01 EDT
Hi Jens,
The latest version of NetworkManager-openvpn has support for tls-remote.

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