If you are running Microsoft IIS on your Web servers, you can download and use two free tools Microsoft has developed to secure your servers: Network Security Hotfix Checker (
HFNetChk) and
IIS Lockdown Tool. HFNetChk checks the servers for missing IIS patches, while the IIS Lockdown Tool turns off "unnecessary features" that attackers could exploit for attacks. Because HFNetChk produces its results in raw text format, another free tool,
Hotfix Reporter, converts them into HTML with links to the missing patches and additional information. You should run these tools on your test systems before applying them to your production systems to avoid any unexpected results.
For Apache users, you won't find any tools equivalent to HFNetChk or IIS Lockdown Tools for your servers. One possible reason is that most of the vulnerabilities you'll face are on the application level (e.g., PHP) rather than on the Apache server itself. But you can still refer to the
Apache Security Tips for Server Configuration page or try using a tool like
Snort.
Building a complete solution to manage your Web server security will take some time, but it doesn't have to cost money with the open source tools currently available. By learning how to apply and use these tools, you not only will gain a better assessment of the risks your Web servers or even your corporate network are facing, you probably also will learn what a malicious Internet user can do to your systems with these same tools. Armed with the data from your scanners, IDS, and server-monitoring tools, you will know yourself and your enemy better, thereby having better knowledge about what you should improve and what you should monitor closely.
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