LINUX:SECURITYTIPS - CRMDA.
The freeze could only be gotten out of while pressing the reset button, was browser agnostic, and happened every 15 minutes. I get no logs about the freeze, and it requires a hard reset. Denyhosts Startup denyhosts_enable=YES. Well, with my upgrade to a recent snapshot, things have changed. I thought I was getting a lot of DenyHosts emails recently and the statistics page on the DenyHosts website seems to agree with me. Anyway, what happened after the reset had me a bit stumped until this morning when I realised what was happening. SSH daily s via DenyHosts stats for Oct23 2007. As a result it was necessary for most contributors to reset authentication tokens of various types (see this same issue. It also appeared that a concurrent event had led to the signing of some Red Hat OpenSSH packages, but that these had been quickly detected and had not led to the distribution of compromised packages. I know this is any unpopular subject but if anyone can help me navigate this madness Id appreciate it. Why is it that denyhosts cant see its own pid file. 1) Ive installed rpmforge -gt; yum check-update $ yum install denyhosts. Bump patch level to 320. Branching off to maintain the 0.24.x version. Update to 3.3.0 beta 1. Update to 2.12. Fix testsuite and add required pkgs.
UBUNTU FORUMS - HOWTO - INSTALLING DENYHOSTS.
Jan Feb Mar Apr (16) May Jun Jul (6) Aug Sep Oct Nov Dec. I just upgraded to Ubuntu 8.04, and like a fool I did not save a copy of my nicely working denyhosts. As a result it was necessary for most contributors to reset authentication tokens of various types (see this same issue. It also appeared that a concurrent event had led to the signing of some Red Hat OpenSSH packages, but that these had been quickly detected and had not led to the distribution of compromised packages. quot; of messages sent # by DenyHosts when it reports thwarted abuse attempts SMTP_SUBJECT = DenyHosts Report. On the heels of last weeks entry on using DenyHosts, and Nikto the week before that. I thought it appropriate to continue in the security vein with five more simple techniques that you can use to protect your systems. However, we need one for DenyHosts to work, and DenyHosts wont pull one in as a dependency. The last section controls DenyHosts relatively new ability to synchronize your list of ers with every other users of DenyHosts that has enabled this feature. DenyHosts) - which relies on botnets falling for #1, which they increasingly dont. Also, you cant reset it and email them a new one, since their email could be compromised as well. IP / host whitelists combined with traditional auth (sadly useless with dynamic IP users and the high churn on most web sites). I am using denyhosts on a server so in a config file / etc / denyhosts.
DENYHOSTS SMART DEFENSE FOR YOUR SSH SERVER - ZARZAX THE BLOG - POSTS.
confthe following value is setQuote:DENY_THRESHOLD_INVALID = 3which as per their configuration file saysQuote. At present Ive reset everything in the / etc / pam.d directory back to the default state. Here is one log for installing / security / denyhosts, which requires python. Error code 1 Stop in / usr / ports / security / denyhosts. Reset the BIOS to safe or default settings. The following configuration parameter has been renamed: DENY_THRESHOLD has been renamed DENY_THRESHOLD_INVALID - added the ability to automatically reset host login attempts after a given time period (age_reset) has elapsed. sometimes it says Read from remote host: Connection reset by peer. The owner could have denyhosts set up and only allow clients to access it from a single IP. Any ideas on how to fix this. Good luck paying customer service to handle requests to reset these blocks once your customers forget their passwords. Which is exactly what denyhosts and fail2ban do. Typically there is an account lock mechanism in place before the IP block. DenyHosts is a script intended to help Linux system administrators thwart ssh server s.
DENYHOSTS SPERRT MICH AUS - MAILINGLIST ARCHIVE - OPENSUSE-DE (1438 MAILS).
DenyHosts scans an ssh server log, updates / etc / hosts. deny after a configurable number of failed attempts from a rogue host is determined, and alerts the administrator of any suspicious logins. Then, I reset all valves on the boiler to their pre-Alex positions, and reset the water flow to the house. Afterward, I turned the boiler back on for a few minutes (to ensure it still worked), turned it back off, then waited a while for the plumber. Eg SMTP_SUBJECT = DenyHosts Report - $ will result in the following expansion: SMTP_SUBJECT = DenyHosts Report - foo on a host that is named foo - added configuaration option SMTP_DATE_FORMAT which allows you to override the DenyHosts Date. quot; field when sending reports via email - fixed bug in prefs. The only thing close I can find in the config is AGE_RESET_VALID=3D5d= , but gt; if Im reading it right thats the inactivity counter between attempted= gt; s for resetting the count to zero. Sudo service sshd restart Stopping sshd: Starting sshd: $ sudo pam_tally --user admin --reset User admin 500 had 6 $ sudo pam_tally --user admin --reset User admin 500 had 0 $ pam_tally $ ssh localhost admin@localhosts password: Permission denied, please try again. Thinking the password got reset for some reason, I tried reseting the password after powering off the linode, but no good. A quick google finds lots of results of how to reset the sudoers file. Unfortunately, the way that Amazon operates its EC2 service they have no ability to do anything to your instance once it is running. My first thought was that DenyHosts had borked me but that turned out not to be the case.
AWS DEVELOPER FORUMS - CANT ACCESS MY INSTANCE AND LOST ROOT.
On the heels of last weeks entry on using DenyHosts, and Nikto the week before that. Sudo wajig install ssh denyhosts molly-guard sshfs yafc keychain sudo -e / etc / ssh / sshd_config. I used to configure denyhosts to make it more restrictive and quicker to ban, but I dont bother anymore. I modify / etc / hosts to assign shortcuts to several of my most-used machines. AGE_RESET_VALID - Specifies period of time between failed login attempts that, when exceeded will reset failed count for host to 0. I have set it to yes which causes failed attempt count for host to be reset to 0 after successful login. Another very interesting feature is the purge option that can be used to reset the number of failed logins after a defined time interval. Running DenyHosts in daemon mode or as cron job leaves the time interval between two scans of the log files as time window for an er. net / faq.html#sync_download_resiliency - added RESET_ON_SUCCESS option which, when set to yes will automatically reset the counter for the connecting ip address to 0 if the login was successful. The default is no. This may be helpful in the event that a user occassionally mistypes their password. Nvu missing from repositories, Duncan Lithgow, 2007 / 03 / 31. Install trouble - hard disk.
DENYHOSTS - AUTOMATED SSH BRUTE FORCE RESPONSE SYSTEM - SAVVYADMIN.COM.
DenyHosts will also inform Linux administrators about offending hosts, ed users and suspicious logins. Just posted release 0185 of Processing on the download page. org/pipermail/freebsd-questions/2006-December/138184. html
SourceForge. net Logo - Port Scan Attack Detector - SourceForge. net - psad - psad-discuss You should probably be using a brute force detector like denyhosts. Or of course the person on the other end can reset their internet connection and should be able to have access that way, or you can explicitly trust that IP. There are others. Unlike ## fail2ban or DenyHosts, there are NO userspace requirements -- not ## even sshd is needed echo +1.2.3.4 gt; / proc / net / xt_recent / whitelist ## to whitelist 1.2.3.4 for an hour. New connections from IPs blacklisted within the last ten minutes are # chaotically rejected, AND reset the countdown back to ten minutes. Jan Feb Mar Apr (16) May Jun Jul Aug Sep Oct Nov Dec. Does DenyHosts need to be restarted after a host is added to allowed-hosts or will the file get re-read automatically. I believe it requires a restart since the allowed-hosts is only parsed at startup time. I dont recall adding support for any other behavior.
NOTES, TRICKS, TIPS - LINUX.
Other useful features include email notification when hosts are blocked, and counter resets after successful authentication to prevent accidental blacklisting caused by fat fingered admins. For those of you using Ubuntu 7.04 (Feisty Fawn) and above, it is available in the Universe repository. Running any kind of server at all is a risk, because the internet is a bad place full of bad people who like to destroy things for fun (and if you dont believe me, read this). If you need to manually reset your sound source for any reason, Option-click on your sound icon in the menubar and choose Internal Speakers. I would run ssh on the standard port and use something like fail2ban or denyhosts to limit the number of dictionary s. cfg, even if that would start the daemon. I had to kill a wedged denyhosts process today on my server. Denyhosts is supposed to kick in and block that IP after 5 failed attempts in 3 minutes.
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