Ruby Undefined Method, Metasploit - ruby

I've been trying to get credentials hashes on a windows meterpreter session, but each time i run "run post/windows/gather/hashdump" i get the following error:
Post failed: NoMethodError undefined method unpack' for nil:NilClass
Call stack:
/usr/share/metasploit-framework/modules/post/windows/gather/hashdump.rb:42:inrun'
the unpack() method is used through all of the hashdump.rb script but as the meterpeter session tells it's not defined.
I've never used ruby before, so i don't know whether it's a predefined method or should i define it, nor how to do it.
Any help is appreciated.
Thanks.


It looks like hashdump is failing to retrieve the boot key from the system registry. My best guess is that you're trying to run hashdump without system privileges.
With insufficient access, the script returns nil instead of the boot key, then tries to unpack nil which causes a fairly unhelpful NoMethodError.
Try running getsystem before you run hashdump.

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Could anyone please help me regarding this doubt? For this I will be thankful.

As I understand correctly the create method in controller creates also the comment and sends the email for the freshly created comment?
Then it would be better to use a callback here.
We had the same issue in our project and we solved it by using something like that:
# in model
after_commit :send_mail, on: :create
private
def send_mail
CommentNotification.send_comment_mail(campaign.user).deliver_later
end
Then you can be sure that the record really exists in the Database before the mail gets delivered.
The problem here is, that you run a Comment#create and enqueue the mail in the controller. Now it can happen, that Sidekiq runs the task before Rails commits the new comment.
And then you get exactly this error.
Regards,
spa

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