Home page logo
/

nanog logo nanog mailing list archives

Re: M$SQL cleanup incentives
From: William Allen Simpson <wsimpson () greendragon com>
Date: Sat, 22 Feb 2003 17:25:54 -0500


Doug Clements wrote:
I see. So you're still filtering port 25 from the Morris sendmail worm.

Funny thing, I was a researcher visiting at Cornell, and had just left 
in the car for the 9.5 hour drive home when it struck.  I've often
wished I'd stuck around for a few more hours for the excitement.

Anyway, we didn't need to put in a long term block, as everyone took 
down their systems and cleaned them.  I didn't even find out about the 
problem until over a day later, by which time it was long gone.  

Ah, the days when we all cooperated....

Well, of course, there were fewer systems involved. ;-)  Then again, 
there were fewer people to fix them, too.


The issue I had with your argument is "forever". You should realize as well
as anyone that the course of software development and implementation will
mitigate the threats of the slammer worm until it's nothing more than a bad
memory.

Sure.  I'll be happy to modify that *forever* to "when all M$ systems 
have been cleaned and updated."  Let us all know when that happens, 
will you?


The first step in eradication is detection. I presume that since you're
taking this stance, you're checking your filter logs and attempting to
notify the appropriate partys for each hit.

For some silly reason, not all operators are notifying their own 
customers, even when reported.   

Anyway, we passed the detection phase long ago, and the second step in 
eradication is quarantine.  That's what I'm talking about!


If you're not, then our buddy trying to infect all the machines on his
network every so often is being more effective in wiping out the worm.

Fascinating.  I'm sure his legal department will have an opinion on that. 

However, we could help protect him from legal issues by adopting 
self-help as a "Best Current Practice."  Are you ready and willing to 
write up the internet-draft?


If you "didn't" filter or "don't" filter? We definately filtered when the
worm first came out. We don't block port 1433 anymore (nor does any of our
upstreams), but we still report suspicious traffic. Regardless of what
everyone else is doing, the worm is not causing a meltdown anymore. 

The reason is that many of us are _still_ filtering.  Some who removed 
filters put them back.


correct course of action is to remove filters as resources allow, and
investigate infected machines as they are noticed.

Unfortunately, I haven't seen a lot of investigation.  Perhaps you 
can explain why the infection rate is still the same after 3 weeks?

Anyway, I'll chalk you in the column for removing all filters, and 
hoping for the best.

-- 
William Allen Simpson
    Key fingerprint =  17 40 5E 67 15 6F 31 26  DD 0D B9 9B 6A 15 2C 32


  By Date           By Thread  

Current thread:
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]