[maemo-users] Permissions on /etc/sudoers messed up - reflash?

[From: Philipp Haselwarter]

I chmod 0640'ed /etc/sudoers on my N900 and closed the terminal -.-
sudo gainroot/chmod/... fails complaining about the permissions, the gui
package manager does so silently.
Can't mount the filesystem root offline on another device to chmod 0440
back (?), can't login as root locally, ssh to localhost seems to work but I
don't have the slightest idea about the root password.

Any way to avoid a reflash?

-- 
Philipp Haselwarter