From James Digriz@1:123/755 to All on Fri Apr 5 11:48:17 2019
I'm crossposting this from an othernet, and I'm also looking for any pointers or app-specific rulesets for setting up snort on an MBSE host or its LAN. I'm just getting back into snort, not sure if there are any MBSE specific rules, but it appears this new openappID thingy may be of some use.
I'm also going to aggregate all my hosts' blocklists and have some kind of rsync
script to run from cron to keep them synced. As noted below, I'm using CSF to generate them. I have fail2ban installed; not using it tho. Trying to keep
the performance impact in check. If anyone has any pointers setting all this up,
I'd appreciate it. Willing to share blocklists, etc. Or is there an echo for this, maybe?
Well, it happened again. A spambot managed to find the unpassworded newuser login, and despite my having disabled email access for new users the last time this happened, managed to start sending spam by using or forwarding ssh from there, to port 25 on the localhost address.
I've blocked IP's the bot was using, and some others that csf hadn't caught, but to fix
this I'm going have to disable localhost's smtp access except for valid users. Remains to be see how much is involved there. It's supposed to have already been done, but apparently I missed something.
So, if you experience any difficulty posting emails from, or sending to, bbs.dragonsweb.org, that's the reason. The smtp server is turned off while I modify the configuration and do some testing, till further notice.
Sorry this happened, but I can't tell you how much I detest apologizing for someone else being a jerk.
ps. it wouldn't have stopped this particular incident, but this is the kind of thing that also has me seriously considering allowing telnet access through a TLS tunnel. Only. So, if you're running old systems and require telnet access,
you'll be wise to be able to do so from behind an stunnel or other TLSified port on your linux or rpi "firewall", portmaster, etc.
Also why everyone should be sure their netmail is working properly;-)