Show picture from post with permalink in sidebar

Hello,

i need some help, please. I write some posts with pictures. Now i want only the picture from the post to show up in the sidebar with a permalink to the post itself.

I would be great if i can show up to 5 pictures in random in the sidebar.

Is there maybe a plugin ? I already use the NextGEN Galerie.

Anyone knows how to fix it ?

Cheers
Denis