I had a development server breached that I had an old development copy of the Endchan database (without media).
All users are advised to change their passwords ASAP.
Development server was breached used an redis/ssh exploit. Redis was installed and usually ran as a user but recently doing some development work, I accidentally started it up as root to look something up and left it running. Redis then can write to your ssh keys and insert unwanted keys and allow root access. All files in /root and /home were removed and a note was left:>Hi, please view here: http://pastebin.com/raw/vadfLyDS for information on how to obtain your files!
Luckily I have bandwidth logs on that box and I can see there was nothing transferred out of the box. So my guess is they just deleted the files. The nature in which they left the machine leads me to believe this was an automated attack (plenty of other meaningful data directories were left alone).
The copy of Endchan's data is left untouched on this development server. However the dump that was used to transfer the copy was still likely in the /root directory that was deleted. I will get the date of the data copy as soon as I can do some data recovery on that machine, I estimated the copy to be an early 2016 Q2 dump. This server is now offline.
At Endchan, we want to be as transparent as we possibly can and even though we do not believe anything was leaked, we cannot rule out nothing happen with 100%. And even if we could be certain that nothing was at risk, we still want to report anything of this nature to our users.
I fucked up, I'm sorry for any troubles this may and has caused any of you.
Please let us know any questions you may have.