/etc/sudoer/ - Is it possible to enter into single user mode through putty?

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http://serverfault.com – I accidentally chown the /etc/sudoer/ folder so that my sudo command no longer works. (I can only ssh into this Linux Centos vm on windows azure) I don't have the root password and I wonder how I may reset the root password, or just chown the /etc/ folder back to root. Thanks a lot! (HowTos)