Security

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Preventing Brute Force Attacks With BlockHosts On Debian Etch

Preventing Brute Force Attacks With BlockHosts On Debian Etch

In this article I will show how to install and configure BlockHosts on a Debian Etch system. BlockHosts is a Python tool that observes login attempts to various services, e.g. SSH, FTP, etc., and if it finds failed login attempts again and again from the same IP address or host, it stops further login attempts from that IP address/host. By default, BlockHosts supports services that use TCP_WRAPPERS, such as SSH, i.e. services, that use /etc/hosts.allow or /etc/hosts.deny, but it can also block other services using iproute or iptables.

Chrooted SFTP With MySecureShell On Debian Etch

Chrooted SFTP With MySecureShell On Debian Etch

This tutorial shows how to install MySecureShell on a Debian Etch system. MySecureShell is an SFTP server that is based on OpenSSH and can be configured in many ways, e.g. it has support for chrooting users into their homedirs or for limiting upload-/download bandwidths. MySecureShell makes SFTP available for users that do not have shell access so that these users do not have to use the insecure FTP protocol anymore.

Virus Protection With AVG Antivirus On Ubuntu Feisty Fawn

Virus Protection With AVG Antivirus On Ubuntu Feisty Fawn

This tutorial shows how you can install and use AVG Antivirus on an Ubuntu Feisty Fawn desktop. Although there aren't many Linux viruses out there, this can be useful if you often exchange files with Windows users - it can help you to not pass on any Windows viruses (that don't do any harm to Linux systems) to Windows users. AVG Antivirus for Linux is free for private and non-commercial use.

Chrooted SSH/SFTP Tutorial (Debian Etch)

Chrooted SSH/SFTP Tutorial (Debian Etch)

This tutorial describes two ways how to give users chrooted SSH access. With this setup, you can give your users shell access without having to fear that they can see your whole system. Your users will be jailed in a specific directory which they will not be able to break out of. The users will also be able to use SFTP in their chroot jails.

How To Harden PHP5 With Suhosin On OpenSuSE 10.2

How To Harden PHP5 With Suhosin On OpenSuSE 10.2

This tutorial shows how to harden PHP5 with Suhosin on an OpenSuSE 10.2 server. From the Suhosin project page: "Suhosin is an advanced protection system for PHP installations that was designed to protect servers and users from known and unknown flaws in PHP applications and the PHP core. Suhosin comes in two independent parts, that can be used separately or in combination. The first part is a small patch against the PHP core, that implements a few low-level protections against buffer overflows or format string vulnerabilities and the second part is a powerful PHP extension that implements all the other protections."

How To Harden PHP5 With Suhosin On CentOS 5.0

How To Harden PHP5 With Suhosin On CentOS 5.0

This tutorial shows how to harden PHP5 with Suhosin on a CentOS 5.0 server. From the Suhosin project page: "Suhosin is an advanced protection system for PHP installations that was designed to protect servers and users from known and unknown flaws in PHP applications and the PHP core. Suhosin comes in two independent parts, that can be used separately or in combination. The first part is a small patch against the PHP core, that implements a few low-level protections against bufferoverflows or format string vulnerabilities and the second part is a powerful PHP extension that implements all the other protections."

How To Harden PHP5 With Suhosin On Fedora 7

How To Harden PHP5 With Suhosin On Fedora 7

This tutorial shows how to harden PHP5 with Suhosin on a Fedora 7 server. From the Suhosin project page: "Suhosin is an advanced protection system for PHP installations that was designed to protect servers and users from known and unknown flaws in PHP applications and the PHP core. Suhosin comes in two independent parts, that can be used separately or in combination. The first part is a small patch against the PHP core, that implements a few low-level protections against bufferoverflows or format string vulnerabilities and the second part is a powerful PHP extension that implements all the other protections."

How To Harden PHP5 With Suhosin On Mandriva 2007 Spring

How To Harden PHP5 With Suhosin On Mandriva 2007 Spring

This tutorial shows how to harden PHP5 with Suhosin on a Mandriva 2007 Spring server. From the Suhosin project page: "Suhosin is an advanced protection system for PHP installations that was designed to protect servers and users from known and unknown flaws in PHP applications and the PHP core. Suhosin comes in two independent parts, that can be used separately or in combination. The first part is a small patch against the PHP core, that implements a few low-level protections against buffer overflows or format string vulnerabilities and the second part is a powerful PHP extension that implements all the other protections."

How to Avoid Being Blacklisted

How to Avoid Being Blacklisted

A blacklist usually refers to a list of e-mail or IP addresses known to send spam e-mails or some other type of unsolicited messages. Such lists are currently used by mail servers for filtering incoming e-mails and blocking the ones listed, in order to improve mail security and integrity. The blacklist is also the opposite of what is called a whitelist.

Installing ModSecurity2 On Debian Etch

Installing ModSecurity2 On Debian Etch

This article shows how to install and configure ModSecurity (version 2) for use with Apache2 on a Debian Etch system. ModSecurity is an Apache module that provides intrusion detection and prevention for web applications. It aims at shielding web applications from known and unknown attacks, such as SQL injection attacks, cross-site scripting, path traversal attacks, etc.

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