While they do bother me, but I can’t just block a random cloud address the source IP is probably dynamic so who know when any of them will be assigned to something legit. I just wanted to be sure that there wasn’t a real vulnerability they
were trying to exploit. Obviously you can’t DDoS with a single request but if they are just going for a DoS it has been possible to do to some applications in the past with a small number of requests over time. These request are appearing on all the nodes
in the cluster. Since nothing is mishandling the requests I will just monitor for any changes.
Darryl Baker, GSEC, GCLD (he/him/his)
Sr. System Administrator
Distributed Application Platform Services
Northwestern University
4th Floor
2020 Ridge Avenue
Evanston, IL 60208-0801
darryl.baker@xxxxxxxxxxxxxxxx
(847) 467-6674
From: Frank Gingras <thumbs@xxxxxxxxxx>
Reply-To: Apache httpd Users <users@xxxxxxxxxxxxxxxx>
Date: Tuesday, November 1, 2022 at 12:11 PM
To: Apache httpd Users <users@xxxxxxxxxxxxxxxx>
Subject: Re: [users@httpd] Questionable URL being sent to our server
I would not attribute this to a "DoS", as you can't really DoS httpd with a single request. It looks like plain URL encoding.
If those log entries bother you, firewall their IP range(s).
They are mostly using GET but there were a couple of HEAD requests. The requests are coming from cloud accounts on Google and Amazon. They are using several variations of the URL
most get 404 errors, which is responded with by a custom 404 page, this is the only one that is getting a 400 error.
Darryl Baker, GSEC,
GCLD (he/him/his)
Sr. System Administrator
Distributed Application Platform Services
Northwestern University
4th Floor
2020 Ridge Avenue
Evanston, IL 60208-0801
darryl.baker@xxxxxxxxxxxxxxxx
(847) 467-6674
What is the HTTP method you see in the logs?
Either way, they may trying to use your server as an open proxy, and failing to do so.
We are getting a poorly formed URL being requested from our servers. Apache is returning a 400 error but I am wondering
if someone is try to exploit an issue with some version of some web server out there. Maybe a Dos attack or worse. Anyone have a clue what is being attempted?
Sketchy URL:
https://www.northwestern.edu/accounting-scrvices/Annual%252ORepothtm
Darryl Baker, GSEC,
GCLD (he/him/his)
Sr. System Administrator
Distributed Application Platform Services
Northwestern University
4th Floor
2020 Ridge Avenue
Evanston, IL 60208-0801
darryl.baker@xxxxxxxxxxxxxxxx
(847) 467-6674
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