Urgent CF security update released March 1 2019, for CF11/2016/2018, Part 1

Note: This blog post is from 2019. Some content may be outdated--though not necessarily. Same with links and subsequent comments from myself or others. Corrections are welcome, in the comments. And I may revise the content as necessary.

All CF shops are urged to install this update immediately, to implement new protections against a known attack happening in the wild. It's identified in the associated Adobe Product Security Bulletin, APSB19-14, as a priority 1 critical vulnerability.

I will add that I can vouch personally for the significance of the vulnerability, as I reported it to the Adobe Product Security Incident Response Team (PSIRT), and I proposed the fix which was implemented. (I also know what was done specifically to perpetrate the attack, and the very negative consequences of what happened once the server of a client of mine was attacked. You don't want this to happen to you.) I plan to share much more in a part 2 post (now posted, but do see below for the context it builds upon).

(In the meantime, I have tweaked this part 1 since originally posting it, to share more here.)

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