search for: bruteforc

...should be a basic defence that when the password is wrong 'n' > occasions the IP address is blocked automatically and permanently > unless it is specifically allowed in IP Tables. As has been mentioned, fail2ban does this. However, the reason you want a password that is not easily bruteforced has nothing to do with this, and all bruteforce attempts cannot be blocked by this method. Scenario: 1.) There's some sort of security vulnerability that allows an intruder to read an arbitrary file. This type of vulnerability (whether it be in php, glibc, bash, apache httpd, or whateve...

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|...

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,...

Gang, For months now, we're all seeing repeated bruteforce attempts on SSH. I've configured my pf install to ratelimit TCP connections to port 22 and to automatically add IP-addresses that connect too fast to a table that's filtered: table <lamers> { } block quick from <lamers> to any pass in quick on $ext_if inet proto tcp from...

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), after > connecting to your system only once. Oh, and the program to do...

...d 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 possible to execude some script after failed login ("Password mismatch") ? Regards, Jacek

...m 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 hostap has nice logging, but anything beyond that ? e.g. with a bad psk on the client hostapd: ath0: STA 00:0b:6b:2b:bb:69 IEEE 802.1X: unauthorizing port is there a way to black list MAC addresses, or just allow certain ones from even trying ? IPSEC will be running on...

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...

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 connect to this port or number of connections per IP per unit of time using firewall. All of them have disadvantages. I use patched v...

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 have to replace the whole instruct...

...have dynamically, and then in the SMTP/IMAP server, lock down auth to the authorized IP of that particular user account only. Its very important, that upon authing with a incorrect IP, that the server responds in the same way as a invalid password was specified, in this way, if someone attempts to bruteforce the password, they will "miss" the correct password, if the server does not react differently to a correct password but invalid IP. Thus bots that bruteforce will not gain any success. All this can be combined with permanent whitelists and geoIP whitelists, to avoid users having to aut...

...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 in the >> fight with bruteforce attacks. >> >> > fail2ban is your friend, it can analyze the logs, no need for saving > that on database. > > > -- > > > Atenciosamente / Sincerily, > Leonardo Rodrigues > Solutti Tecnologia > http://www.solutti.com.b...

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 0:00 imap-login dovecot 5852 0.0 0.1 2320 692 ? SN Jun21 0:00 imap-login Looks wonderfull...

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"

...nction 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 without bruteforce in an acceptable time? thx Christof

...; > b. > > > On 22 July 2015 at 22:54, Bostjan Skufca <bostjan at a2o.si> wrote: >> I just stumbled upon this story too (on /.), and as far as I >> understand it, it allows a bit simpler way to perform brute force >> attacks. >> >> If you go about bruteforcing ssh, does it really matter that much if >> you do it over one or 10 tcp connections? >> >> If you do not have IDS (Intrusion Detection System, fail2ban or ossec >> HIDS) installed and functioning, this bug does not matter all that >> much. Determined attacker has t...

...ny filesystems except / is mounted. Gbde fails also because the system can't do interactivaly query for the passphrase. I wanted to use a 3 way authentication for the slice, encrypted fs, a usb key and passphrase. I can use geli without the usb key (keyfile). But that would render a possible bruteforce entry. Is there a way to have something similar like this working? I even thought of using something like vendor, product and serial ids for the "keyfile" which could be used with any usbdevice on the usb bus. Have any of you thought about these things and have a way to do this sort...