search for: bruteforcers

...millions of bruteforce attempts per second on the exfiltrated /etc/shadow, on their computer (not yours). 4.) After a few hours, attacker has your password (or at least a password that hashes to the same value as your password), after connecting to your system only once. Now, there are the slow bruteforcers running out there, but those are not the droids this change is looking for. By being 'encouraged' to have a difficult to bruteforce password from the very first, you have better security even when the attacker exfiltrates /etc/shadow or other password hash table (I say 'when' a...

I read an article today about keyboard interactive auth allowing bruteforcing. I'm afraid I have minimal understanding of what keyboard-interactive really does. What does it do, and should I have my clients set it to off in sshd_config? --- Scott Neugroschl | XYPRO Technology Corporation 4100 Guardian Street | Suite 100 |Simi Valley, CA 93063 | Phone 805 583-2874|Fax 805 583-0124 |

Two pc's: 1 - router 2 - logger Situation: someone tries to bruteforce into a server, and the logger get's a log about it [e.g.: ssh login failed]. What's the best method to ban that ip [what is bruteforcig a server] what was logged on the logger? I need to ban the ip on the router pc. How can i send the bad ip to the router, to ban it? Just run a cronjob, and e.g.: scp the list

...tcp from any to ($ext_if) port 22 modulate state (source-track rule max-src-nodes 8 max-src-conn 8 max-src-conn-rate 3/60 overload <lamers> flush global) This works as expected, IP-addresses are added to the 'lamers'-table every once in a while. However, there apparently are SSH bruteforcers that simply use one connection to perform a brute-force attack: Aug 18 00:00:01 aberdeen sshd[87989]: Invalid user serwis from 83.19.113.122 Aug 18 00:00:03 aberdeen sshd[88010]: Invalid user serwis from 83.19.113.122 Aug 18 00:00:05 aberdeen sshd[88012]: Invalid user serwis from 83.19.113.122 Au...

On 02/04/2015 02:08 PM, Lamar Owen wrote: > > 3.) Attacker uses a large graphics card's GPU power, harnessed with > CUDA or similar, to run millions of bruteforce attempts per second on > the exfiltrated /etc/shadow, on their computer (not yours). > 4.) After a few hours, attacker has your password (or at least a > password that hashes to the same value as your password),

We alse have same problem, now we are running Dovecot 2.2.30.2 and also use Dovecot SASL for SMTP authentication (postfix 2.11). We need to save all failed login attempts to database as source IP address, username and date and time but post-login script can do this but only after successful login. Failed login attempts information may be useful in the fight with bruteforce attacks. It's

I have been playing around with 3 ath based FreeBSD boxes and seem to have got everything going via WPA and a common PSK for 802.11x auth. However, I want to have a bit more certainty about things working properly. What tools do people recommend for sniffing and checking a wireless network ? In terms of IDS, is there any way to see if people are trying to bruteforce the network ? I see

Hello All, I had problems with the security server, the server is frequently attacked using bruteforce attacks. Is there an application that can perform automatic blocking when there are failed login to the ports smtp, pop3 port, and others? I am currently using CentOS 5.5 in some servers Thanks in advanced....... -- -- Best regards, David http://blog.pnyet.web.id -------------- next part

...botnets ? is done on pnwed hardware, much of which was compromised by previous botnets banging on weak SSH passwords. > Since most of that crap comes from Windows hosts, the security of Linux > SSH passwords seems hardly relevant. > I happen to know from firsthand experience that SSH slow bruteforcers on Linux are a significant portion of the 'botnet' traffic out there. How do I know this? From a hacked Linux server which was brute-forced and conscripted into being a slow bruteforcer node back in 2009 or so. The particular payload that was dropped on that box was dropped into a n...

Hello, What is the best way to protect multiuser systems from brute force attacks? I am setting up a relatively loose DenyHosts policy, but I like the idea of locking an account for a time if too many attempts are made, but to balance this with keeping the user from making a helpdesk call. What are some policies/techniques that have worked for this list with minimal hassle? Thanks! -Eugene

Steps to reproduce: 1) PermitRootLogin no in sshd_config 2) login with "root" user from other host Present behaviour: 1) it asks for password 3 times and only then close the connection. 2) cpu consumption during bruteforce "attacks". Expected behaviour: Immediate disconnect/login fail Workaround is to change ssh port, or ban IP after some login fails, or limit IP that can

Hi, I am trying to replace a global variable with a constant. I did manage to do it, but somehow it appears to be fairly bruteforce by just iterating over all functions/bblocks/instructions and filtering for those that load the variable and replacing the instruction with Instruction::replaceAllUsesWith(). The more intuitive way of iterating over the uses of the variable did not work out as I

>>"Never use a browser for email." I don't agree. In fact, using a browser for email or atleast initial setup, is actually more secure. This because SMTP/IMAP clients normally don't support 2FA, so you would have to "hack" a solution to enable 2FA for email. This can be made in 2 ways: Either, you have a full fledged email setup. Whats important, is, to prevent

I need to save that to database because I have more then one mail server and them must share each other failed login attempts information. I'll try check how Dovecot Authentication Policy works. --JAcek 2017-06-12 16:50 GMT+02:00 Leonardo Rodrigues <leolistas at solutti.com.br>: > Em 12/06/17 09:39, j.emerlik escreveu: > >> Failed login attempts information may be useful

Hi Everyone, For all the folk here on this list that offer VPS hosting, do you guys just give a VPS to a customer in a non-firewalled state? Cheers _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users

Hi all, I think I've found a Bug in current rc2 (same occours with rc1 and 0.99.9.1). I'am running dovecot with imap, pop3 and the ssl equivalents, after a nessus scan of my host with Bruteforce checks on IMAP, imap-login eats up lots of cpu. Before the scan: dovecot 22342 0.0 0.1 2320 636 ? SN Jun18 0:00 imap-login dovecot 5841 0.0 0.1 2320 692 ? SN Jun21

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=57859 There's a method to see if an account exists or not: if it does exist, and the password fails, there's a small delay before getting the prompt again. But if it doesn't, the password prompt returns immediately. Looks like a bug... :o) -- Florin Andrei Linux Is Not "gnU linuX"

Hi I have "observations" obs <- (11455, 11536, 11582, 11825, 11900, ...) and a simulation function f(A,B,C,D,E,F), so sim <- f(A,B,C,D,E,F) e.g. sim = c(11464, 11554, 11603, 11831, 11907, ...) now I would like to fit A,B,C,D,E,F such that "obs" and f(A,B,C,D,E,F) match as well as possible. A,..,F should be integers and have bounds. How would you solve this problem

You need to disable ?ChallengeResponse? (aka keyboard-interactive) authentication, not password authentication, to protect against this attack. On Jul 22, 2015, at 1:56 PM, Bostjan Skufca <bostjan at a2o.si> wrote: > > And to answer your question about what to do, you have three options: > - disable access to ssh with a firewall > - disable password authentication > -

Hello, I was playing around with geli an gbde after last EuroBSDCon. I liked the idea of encrypting my data which resides in /home/$user. Since this is a "single" user laptop i intended to encrypt the whole /home partition. Well no problems with that. But i wanted the lockfile or keyfile on a seperate usb disc. Which would be mounted or used during boot of the system. I also used