Getting trouble with Sudo permissions

When I've give "sudo bash" in terminal, following error message is displaying

sudo : /etc/sudoers is mode 0555, should be 0440
sudo : no valid sudoers sources found,quitting
sudo : unable to initialize policy plugin

What might be wrong, suddenly this message was showing.

Quote:

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Originally Posted by dmahesh22

When I've give "sudo bash" in terminal, following error message is displaying

sudo : /etc/sudoers is mode 0555, should be 0440
sudo : no valid sudoers sources found,quitting
sudo : unable to initialize policy plugin

What might be wrong, suddenly this message was showing.

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/etc/sudoers is by default 0440. you might have changed that accidentally
can you run other sudo commands? if yes then revert it back to 0440

Code:

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sudo chmod 0440 /etc/sudoers

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the above command is not working,because actual trouble with "Sudo".

Thanks for reply

I think you will need to boot into the recovery console, remount the root filesystem read-write, and do the chmod from there

Code:

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# mount -o remount,rw /
# chmod 0440 /etc/sudoers
# exit

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If you changed file modes on other stuff that you shouldn't (e.g. by doing a recursive chmod in the root filesystem) then other things may be broken as well though.