Clément Lefebvre, creator of the Linux Mint distribution, announced yesterday that the project’s infrastructure had been hacked, and malicious ISO installation files downloaded by users.
Lefebvre writes:
“I’m sorry I have to come with bad news.
We were exposed to an intrusion today. It was brief and it shouldn’t impact many people, but if it impacts you, it’s very important you read the information below.
What happened?
Hackers made a modified Linux Mint ISO, with a backdoor in it, and managed to hack our website to point to it.
Does this affect you?
As far as we know, the only compromised edition was Linux Mint 17.3 Cinnamon edition.
If you downloaded another release or another edition, this does not affect you. If you downloaded via torrents or via a direct HTTP link, this doesn’t affect you either.
Finally, the situation happened today, so it should only impact people who downloaded this edition on February 20th.
How to check if your ISO is compromised?
If you still have the ISO file, check its MD5 signature with the command “md5sum yourfile.iso” (where yourfile.iso is the name of the ISO).
The valid signatures are below:
6e7f7e03500747c6c3bfece2c9c8394f linuxmint-17.3-cinnamon-32bit.iso e71a2aad8b58605e906dbea444dc4983 linuxmint-17.3-cinnamon-64bit.iso 30fef1aa1134c5f3778c77c4417f7238 linuxmint-17.3-cinnamon-nocodecs-32bit.iso 3406350a87c201cdca0927b1bc7c2ccd linuxmint-17.3-cinnamon-nocodecs-64bit.iso df38af96e99726bb0a1ef3e5cd47563d linuxmint-17.3-cinnamon-oem-64bit.iso
If you still have the burnt DVD or USB stick, boot a computer or a virtual machine offline (turn off your router if in doubt) with it and let it load the live session.
Once in the live session, if there is a file in /var/lib/man.cy, then this is an infected ISO.
What to do if you are affected?
Delete the ISO. If you burnt it to DVD, trash the disc. If you burnt it to USB, format the stick.
If you installed this ISO on a computer:
- Put the computer offline.
- Backup your personal data, if any.
- Reinstall the OS or format the partition.
- Change your passwords for sensitive websites (for your email in particular).
Is everything back to normal now?
Not yet. We took the server down while we’re fixing the issue”.
