“I’m sorry I have to come with bad news,” wrote Clement Lefebvre, head of the Linux Mint project, before announcing Linux Mint suffered an intrusion; on February 20, “hackers made a modified Linux Mint ISO, with a backdoor in it, and managed to hack our website to point to it.”
It’s not all Linux Mint, ranked by DistroWatch as the most popular Linux distribution for the last year, that were affected, but only the ISO for Linux Mint 17.3 Cinnamon edition downloaded from the site on Saturday. Lefebvre noted that other ISO releases downloaded from the site on Feb. 20 as well as the Cinnamon edition ISOs downloaded via torrents or a direct HTTP link should not be affected.
If you downloaded the Cinnamon edition yesterday, then Lefebvre advised users to compare the MD5 signature. However, technologist Micah Lee seemed flabbergasted by that advice, since the attackers could have also changed the MD5 checksums.
Nevertheless, if you installed the maliciously tainted edition, then Lefebvre said to take your PC offline, reinstall a clean version and then change your email and other passwords.
The attackers breached the site via WordPress, Lefebvre admitted in a comment. “The hacked ISOs are hosted on 5.104.175.212 and the backdoor connects to absentvodka.com. Both lead to Sofia, Bulgaria, and the name of 3 people over there.”
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Steve Ragan contacted me to say the config file for phpBB that was posted on Hacker News was copied from elsewhere as 'proof' by the hacker. Additionally, Tsunami isn't the name of the bot; “the code is called Kaiten, and it's been open source since about 2001.”
It's worth noting that Linux was not hacked. It was rewritten and redirected to the counterfeit version.