Tag archive for ‘Security’

Virtual Users And Domains With Postfix, Courier And MySQL (+ SMTP-AUTH, Quota, SpamAssassin, ClamAV) – Part 3

7 Install Amavisd-new, SpamAssassin And ClamAV To install amavisd-new, spamassassin and clamav, run the following command: apt-get install amavisd-new spamassassin clamav clamav-daemon zoo unzip unarj bzip2 You will be asked a few questions: Virus database update method: <– daemon Local database mirror site: <– db.de.clamav.net (Germany; select the mirror that is closest to you) HTTP [...]

How do I install Rootkit Hunter?

Download the gzipped tarball, extract it and run the installation script. download: # wget http://downloads.rootkit.nl/rkhunter-<version>.tar.gz Note: It doesn’t matter where you save the tarball extract: # tar zxf rkhunter-<version>.tar.gz installation: # cd rkhunter # ./installer.sh (Source: http://www.evolution-security.com/) (Source: http://www.rootkit.nl/articles/rootkit_hunter_faq.html)

Virtual Users And Domains With Postfix, Courier And MySQL (+ SMTP-AUTH, Quota, SpamAssassin, ClamAV) – Part 4

8 Install Razor, Pyzor And DCC And Configure SpamAssassin Razor, Pyzor and DCC are spamfilters that use a collaborative filtering network. To install them, run apt-get install razor pyzor dcc-client Now we have to tell SpamAssassin to use these three programs. Edit /etc/spamassassin/local.cf so that it looks like this: # This is the right place [...]

How To Configure The AIDE (Advanced Intrusion Detection Environment) File Integrity Scanner For Your Website

A file integrity scanner is something you need to have.  Imagine a hacker placing a backdoor on your web site, or changing your order form to email him a copy of everyone’s credit card while leaving it appear to be functionally normally. By setting up daily reporting, this notifies you within, at most, 24 hours [...]

Detecting DoS / DDoS Attack on a Windows 2003 / 2008 Server

Question: How do I detect a DDOS (Distributed denial of service) / DOS attack on a Windows Server 2003 / 2000 / 2008? Can I use Linux netstat command syntax to detect DDoS attacks? Answer:A denial-of-service attack (DoS attack) or distributed denial-of-service attack (DDoS attack) is an attempt to make a computer resource unavailable to its intended users. [...]

Linux: Block Port With IPtables

How do I block port number with iptables under Linux operating systems? Port numbers which are recognized by Internet and other network protocols, enabling the computer to interact with others. Each Linux server has a port number (see /etc/services file). For example: TCP port 80 – HTTP Server TCP port 443 – HTTPS Server TCP [...]

Preventing SSH Dictionary Attacks With DenyHosts

Version 1.0 Author: Falko Timme <ft [at] falkotimme [dot] com> Last edited: 02/07/2006 In this HowTo I will show how to install and configure DenyHosts. DenyHosts is a tool that observes login attempts to SSH, and if it finds failed login attempts again and again from the same IP address, DenyHosts blocks further login attempts [...]

Mount /tmp With nodev, nosuid, and noexec Options

How do I mount /tmp with nodev, nosuid, and noexec options to increase the security of my Linux based web server? How can I add nodev, nosuid, and noexec options to /dev/shm under Linux operating systems? Temporary storage directories such as /tmp, /var/tmp and /dev/shm provide storage space for malicious executables. Crackers and hackers store [...]

BIND 9 Dynamic Update DoS Security Update

BIND 9 is an implementation of the Domain Name System (DNS) protocols. named daemon is an Internet Domain Name Server for UNIX like operating systems. Dynamic update messages may be used to update records in a master zone on a nameserver. When named receives a specially crafted dynamic update message an internal assertion check is [...]

How to Install ProFTPD

For this demonstration, we are using Proftpd instead of the widely known and used WU-Ftpd daemon. The main reason for this is security. We will go through the follwing steps that will show you how to set up your own ftp server. Download Installation Configuring Linux for Proftpd Configuring Proftpd Some usefull insformation along the [...]

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