Cloudflare published a very interesting page for curious people about Heartbleed with a website available to try to get the private key with this bug.
Don’t hesitate to look at it, for knowledge about security server.
With this data privacy period (see previous article), it is recommended, when you have private data, to delete them securely (no! move to trash is not how to delete a file, and empty the trash is not how to delete securely a file).
I give a simple but effective example on how to delete a file on Linux with shred command installed on Debian (certainly available with other Linux OS).
shred -n 7 -u -z <file name>
Yes, so simple, so why do not do that?
-n 7 : rewrite 7 times data in the file (default 3, but we are not too careful, 7 seems a good compromise)
-u : delete the file after rewriting
-z : fill 0 to hide shredding before deleting the file
This command take less than 10 minutes for a 7.4 Gb file and 7 pass, so nothing should stop you to do that without losing your day.
You can add -v option to show progress if you are curious.
An exploit (it seems to be a very critical one) endanger our informations transmitted on Internet. If you have servers and you administer them, you have risks to be vulnerable with SSL/TLS service.
To explain brievely, a buffer overflow attack (send data in specifical size and format) can give access to data that have been transmitted encrypted to the server.
You can fix it in a simple way, an apt-get update && apt-get upgrade or yum update should do it. Restart services using this library or reboot your server in a doubt with reboot command.
Finally test your server at this address to check you have fixed it.
More informations on Heartbleed bug.