Brute Force UDP Attack On SSH Port. . Possible/why
Nov 24, 2007
my server is being brute force attacked at port 22.. It caused my server to be blocked by my ISP's upstream...
at first I follow the instruction on this forum showthread.php?t=456571 (can't post link)
but then I realized (from the upstream email, I don't have access to any log on their side) that it was UDP.. not TCP.. but it was said to be brute force attack on SSH port.
Now all I do is moved ssh port.. and then limit the max connection per minute to port 22/UDP like on the above tutorial page..
Is that enough? I can't use IPTables to permit specific IPs, I'm pretty much very mobile so my own IP is different each time.
Any ideas why UDP attack?
Is it possible that brute force attack turned out to be UDP protocol? cause if it's not, then I think my ISP/its upstream can't be trusted..
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Jul 1, 2008
Today I woke up to a couple of emails from people in China and India trying to break into my server. Then as I went to login to WHM I get this message:
This account is currently locked out because a brute force attempt was detected. Please wait 10 minutes and try again. Attempting to login again will only increase this delay.
If you frequently experience this problem, we recommend having your username changed to something less generic.
Are there ways that I can prevent these attacks? I know that the IPs involved are getting banned, but are there any other methods I should be taking?
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Mar 11, 2008
I have a managed VPS and I haven't really ever paid too much attention to the logs until now.
I noticed that the APF logs indicate a 2-5 attacks on my server attempting to log in via ssh. My system allows 10 minutes of log in failure attacks before apf bans the ip.
To eliminate the method of attack, I see 2 ways. One way is to change the SSH port; the second is to only allow ssh via specified ip's.
What are the pro's and con's of both... also are there other ways to eliminate these attacks via ssh?
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Jan 14, 2007
Ok, this is weird. What do you do when your VPS was submitted to a brute force attack from the U.S Department of Defense?
The IP Whois and Reverse DNS gives me "DoD Network Information Center", why in the world would they try to force access to a small (less than 20 clients) Canadian host?
And in case you're wondering, they don't seem to have any abuse email address.
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Jan 21, 2008
I am getting a few hundred IIS 6.0 FTP login attempts a second on my windows 2003 x64 server.
We have a Sonicwall TZ180, a full IPS and Firewall in front of the server but I cannot determine a way to block these attacks. I simply have port 25 open to all ip addresses, as I do not know a range of valid ips.
Is there any way to prevent these attacks at the firewall/hardware level? I suspect not, because the firewall doesn’t know if a login attempt is valid or not.
I have enabled IPS on the firewall but doesn’t appear to be stopping these attacks. Is there any way to automatically ban ips that hit port 25 X number of times in a second?
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Oct 28, 2009
I get a lot of messages from CSF about Port Scanning and Bruteforce detection.. Is there a way to avoid all of these attacks ? Because it tries to figure out my clients ftp or pop3 user with several usernames, i.e. administrator, postgres, mysql, httpd, and many more..
I know a little about internet security.. Is it possible to make my public IP of shared hosting untraceable ? Like this one..
Just do a ping to ebay.com or paypal.com and then you will receive RTO message or Destination host unreachable, but actually the site is running well..
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May 19, 2008
I checked my attachments folder in WHMCS dir
There was a file ftpquickbrute_08.05.2008_10_47_08.log
Opened it up it says:
Quote:
FTP Quick Brute (called c99shell v. w4ck1ng-shell (Private Build v0.3)) started at 08.05.2008 10:47:21
No success. connections!
------------------------------------------
Done!
Total time (secs.): 3.2036
Total connections: 101
Success.: 0
Unsuccess.:101
Connects per second: 31.53
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Oct 27, 2008
flood in FTP and brute force
all day i receved msgs of BFD someone trying acess server, how to stop it, exemple:
Executed ban command:
/etc/apf/apf -d 221.186.164.233 {bfd.pure-ftpd}
The following are event logs from 221.186.164.233 on service pure-ftpd (all time stamps are GMT -0500):
Oct 25 13:52:37 svr1 pure-ftpd: (?@221.186.164.233) [INFO] New connection from 221.186.164.233
Oct 25 13:52:37 svr1 pure-ftpd: (?@221.186.164.233) [INFO] New connection from 221.186.164.233
Oct 25 13:52:38 svr1 pure-ftpd: (?@221.186.164.233) [WARNING] Authentication failed for user [router] ....
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Nov 2, 2008
Over the last few weeks I've been getting emails from WHM stating "x login failures attempts to account root (system) -- too many attempts from this ip"
These emails have been coming in almost hourly and it seems as though somebody is trying to guess the password to the root account and random other accounts.
For now I reduced the amount of failed login attempts to 2 before cPanel blocks the IP.
Is there any other way I can completely stop this person from even attempting to guess my passwords?
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Mar 17, 2008
For a company I'm working at, two nodes have been brute force attempted through SSH. I've got the logs from both servers in front of me, but could anyone enlighten me of who the ISP is?
ISP: host-80-241-179-30.deltanet.ge
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Apr 6, 2007
ive just installed bfd on a new server:
[url]
And im getting the following in an email every 10 minutes:
Code:
/usr/local/bfd/conf.bfd: line 26:
: command not found
/usr/local/bfd/conf.bfd: line 38:
: command not found
/usr/local/bfd/conf.bfd: line 47:
: command not found
/usr/local/bfd/conf.bfd: line 59:
: command not found
/usr/local/bfd/conf.bfd: line 60:
: command not found
/usr/local/bfd/conf.bfd: line 76:
: command not found
/usr/local/bfd/conf.bfd: line 88:
: command not found
The email is being sent from:
Cron Daemon <root@hostname.com> (replaced hostname myself)
Now i know this isnt r-fx networks support but none of there support options seem to work so i figured id post here considering the amount of users that are likely to be using bfd (or you should be)
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Apr 30, 2009
I have some windows 2k3 and 2k8 win servers and now i must to protect..
I need best free/commercial solution for firewall and anti brute force protection.
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Jan 29, 2008
I am getting these types of reports in my nightly reports:
=================
sshd:
Authentication Failures:
unknown (bips131.bi.ehu.es): 212 Time(s)
mail (bips131.bi.ehu.es): 4 Time(s)
news (bips131.bi.ehu.es): 4 Time(s)
root (bips131.bi.ehu.es): 4 Time(s)
unknown (swplinux02.swp.ewr.qwest.net): 1 Time(s)
Invalid Users:
Unknown Account: 213 Time(s)
Two nights ago:
--------------------- pam_unix Begin ------------------------
sshd:
Authentication Failures:
unknown (195.251.109.21): 413 Time(s)
root (195.251.109.21): 108 Time(s)
webadmin (195.251.109.21): 18 Time(s)
root (200.55.193.59): 16 Time(s)
daemon (195.251.109.21): 8 Time(s)
ftp (195.251.109.21): 5 Time(s)
root (218.19.69.193): 4 Time(s)
Invalid Users:
Unknown Account: 413 Time(s)
===============
My VPS support said I could try:
-alternate sshd port
-require key access
-selecting client ip access
-rate limit incoming sshd syn packets per src address
However, I need some help understanding the best way to address these so that these brute force attacks aren't successful.
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Dec 13, 2007
over the last 2 days I've gotten 11 emails telling me about brute force detections on my server, the vast majority of them are for sshd from different IP's.the number of events ranges anywhere from 11 to 515.
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Jul 10, 2007
What is everybody using?
Is there a "Best"
What do you guys recommend?
I have read about the CSF, is this any good?
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Jun 30, 2008
Alright so we have found someone hacking web hosting companies servers by brute attack.
How do we protect ourselves from this and all other hacking attacks?
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Dec 7, 2008
1- I have 2 servers attacked in same time.
2- The public interface experiences a high packet loss. There is a heavy inbound attack to the public interface which gets maxed out at 100MB.
3-There is no target outlets ports
4- I have changed apache port and the DDOS still attack my server
softlayer servers (Washington, DC)
can any one tell me what's the reason of this problem ?
and how to fix it even though there is no port exposed?
softlayer servers (Washington, DC)
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Jul 28, 2009
we have a server that is being attacked by a piece of software along the lines of "port****".
Basically it sends a lot of requests to a single port to kill it, this port being port 80 (http) and killing web interfaces.
Its being used to take a website off line.
What is the best way to defend this? And the quickest way, we have access to the server, its running Fedora.
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Aug 8, 2013
I'm runnung a server with Apache2 (Apache/2.2.16 (Debian 6.0))
I would like Apache2 listen on port 8080 for IPv4 and on port 80 for IPv6.
This is what I have now:
/etc/apache2/ports.conf
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Feb 19, 2008
Currently I am using Linux + cPAnel and using the port 25 for email sevrer. Currently we facing 1 problem is, some user's ISP is not support port. May I know how can I add additional port into server and allow users to send mail by different port?
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Jun 21, 2009
I have an office internal website and I opened a port in the gateway of my office (7080) to this website (server )'s 80 port. That makes this website open to public as office has static IP. And then when I view the site from home . it's fine. But when I tried to login, the site is using a pop-up, I guess it's http authentciation, login, I was redirected to a url without my port number any more, that stops my access to the site as obviously I would.
How can I keep my connection/port number ...?
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Jun 18, 2008
about the NIC and switch,
there are giga port vs mega port,
in your experience,do they really be different?
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Jun 10, 2007
I recently changed my SSH port, but locked myself out when my APF firewall was installed.
Where would I got to add a custom port inside the APF's config file?
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Mar 11, 2008
how to force that the PHP files won't run if the folder permission is 777
I saw this in micfo.com
but I want to know how to do this
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Feb 19, 2007
I would like to know what you do with your BFD data?
when you receive an alert message with IP of who tried to hack your server:
- do you just ignore?
- do you send a message of it abuses for the responsible for IP?
I sent for a long time messages of it abuses, but never nobody answered...
is that normal? when will anybody make something against these people?
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Jul 24, 2007
we're using a subdomain to point to one of our server's IP. (gaming purposes).
And people use this subdomain to connect to the game server.
However, We are going to move to a new server soon with a different IP.
I know, only thing I have to do is change the IP of the subdomain to point to the new server, however I know this will take like 1 to 48 hours to fully work.
Is there a way to force people who's still connecting to the OLD Ip to go to the new IP?
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May 20, 2009
How can I force sendmail to ignore it when a user sets the From: and Reply-to: headers for an email, such as a PHP script? I would like to force it so it always uses whatever email I set.
I cannot seem to find how to do this... sendmail config is quite difficult.
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Feb 2, 2008
we are running a file sharing service and use lighttpd as a web server
the problem is that in Internet Explorer are some files i.e. .mpg, .pdf
and others opened directly in the browser
so is there a way to prevent this behavior(to force the browser to
download the file) by setting headers (or something else) in
lighttpd.conf?
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Apr 13, 2007
how to force sending the e-mails of an Inbox to a outside e-mail like yahoo or hotmail?
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