Web Security Introduction Webserver hacking refers to ...

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HTTP Response Splitting or CRLF injection is an attack technique which enables various attacks such as web cache poisoning, cross user defacement, hijacking pages with sensitive user information and our favorite, cross-site scripting (XSS). This attack technique, and the derived attacks from it, are relevant to most web environments and is the result of the application’s failure to reject illegal user input, in this case, input containing malicious or unexpected characters. The talk will cover the concept of the attack and will take you through some use cases.

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Web sever environment: A Web server is a program that uses HTTP (Hypertext Transfer Protocol) to serve the files that form Web pages to users, in response to their requests, which are forwarded by their computers\' HTTP clients. Dedicated computers and appliances may be referred to as Web servers as well.The process is an example of the client/server model. All computers that host Web sites must have Web server programs. Leading Web servers include Apache (the most widely- installed Web server), Microsoft\'s Internet Information Server (IIS) and nginx (pronouncedengine X) from NGNIX. Other Web servers include Novell\'s NetWare server, Google Web Server (GWS) and IBM\'s family of Domino servers. Web servers often come as part of a larger package of Internet- and intranet-related programs for serving email, downloading requests for File Transfer Protocol (FTP) files, and building and publishing Web pages. Considerations in choosing a Web server include how well it works with the operating system and other servers, its ability to handle server-side programming, security characteristics, and the particular publishing, search engine and site building tools that come with it. Advantages of using a web server within your development environment: Problems posed by web server environment and methods to solve: Various high-profile hacking attacks have proven that web security remains the most critical issue to any business that conducts its operations online. Web servers are one of the most targeted public faces of an organization, because of the sensitive data they usually host. Securing a web server is as important as securing the website or web application itself and the network around it. If you have a secure web application and an insecure web server, or vice versa, it still puts your business at a huge risk. Your company’s security is as strong as its weakest point. Although securing a web server can be a daunting operation and requires specialist expertise, it is not an impossible task. Long hours of research and an overdose of coffee and take away food, can save you from long nights at the office, headaches and data breaches in the future. Irrelevant of what web server software and operating system you are running, an out of the box configuration is usually insecure. Therefore one must take some necessary steps in order to increase web server security. Below is a list of tasks one should follow when securing a web server. 1. Remove Unnecessary Services Default operating system installations and configurations, are not secure. In a typical default installation, many network services which won’t be used in a web server configuration are installed, such as remote registry services, print server service, RAS etc. The more services running on an operating system, the more ports will be left open, thus leaving more open doors for malicious users to abuse. Switch off all unnecessary services and disable them, so next time the server is rebooted, they .

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