I had the same IP connect to me, with the same failed-command.


On 2020-06-12 02:02, Edgar Pettijohn wrote:
On Thu, Jun 11, 2020 at 04:26:37PM -0700, Niklas wrote:
I'm curious what this would actually accomplish on a vulnerable server.

There's no path or executable its trying to find in its iterations. This looks 
more like an arbitrary shell command meant to act as a scan/test to find 
vulnerable servers without fully leveraging the exploit.

If you had the IP it originates from it could tell you a lot.On Jun 10, 2020 8:08 PM, 
Ryan Kavanagh <r...@debian.org> wrote:


On Wed, Jun 10, 2020 at 10:00:08PM -0500, Edgar Pettijohn wrote:
Saw this in the maillog today. Any ideas what they are trying to do?

?? 249c054a86af9328 smtp failed-command command="MAIL FROM: <;for i in 0 1 2 3 4 5 6 7 8 9 a b c 
d;do read r;done;sh;exit 0;>" result="530 5.5.1 Invalid command: Must issue an AUTH command 
My guess is that they're trying to exploit CVE-2020-7247. Search the
advisory text for that command:



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