Web site security expert
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Overview of Web Site Security Considerations
It's unfortunate, but there are several ways in which website security can be jeopardised. Security hazards lurk insidiously which might affect Web servers and LANs (local area networks) where Web sites reside, even by the conventional use of a Web browser.
Web Masters come under fire when managing the critical threats. As soon as a Web server is set up at a site, a porthole comes into being in the local area network through which anyone on the Internet can peek. Obviously, nearly all website visitors look at only what they are supposed to see, but a few try to unearth parts of the site that aren't intended to be evident to the general public. Dishonest visitors would like to do more than just look; they endeavour to unbolt the window and slip inside. The harm they may cause might be mere vandalism, for instance changing the website's home page with their own which could say or put on view anything, or it might be theft, such as gaining possession of a contacts or sales list.
It's hard to evade the probability that intricate computer software includes bugs. No matter how exhaustively it's tested, there exists typically a certain combination of events or user actions, even though it might appear seldom, which will cause a failure. Software bugs cause breaches in system security. A Web server is intricate software that can quite easily include a security gap.
It's not merely the intricacy of a Web server which can instigate a problem, but also its open architecture. Consider a CGI script as a case in point. A CGI script may be processed at the server in reply to a remote request from a client. This might be a request from an application or even the click of a button in a browser. If the CGI script has a bug, there is a risk of a security breach.
Network Administrators also have to face problems from Web servers on account of the risk they pose to the security of the local area network. Whereas there should be no unauthorized incursions, access has to be granted to web site visitors. This means that access to the network should be regulated. The Administrator therefore must perform a delicate balancing act. Even the most sturdy firewall may be compromised if the Web server is configured badly. Concomitant with this constraint, normal use of the website may be unachievable if the firewall is configured badly. Reaching an ideal resolution is yet more difficult if an intranet exists as a constituent of the system. Usually, the Web server in that case needs to be configured to recognise and authenticate domains and user groups, which are likely to have differing permission levels and access rights.
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Almost all people using a browser to surf the Net suppose that they're doing it in secret and securely. This is not the case. Web browsers can run self-contained software programs on the user's computer which are located on a website. Modern browsers display a warning and ask authorization to run those programs. Identified generally as "active content", e.g., ActiveX controls or Java applets, these programs, if malicious, may easily inject a virus or other hazardous software on the browser user's computer. After it is in the system it can cause all kinds of catastrophe and can be extremely hard to get rid of.
This is also a worry for Network Administrators. Web browsers afford a path for possibly malicious software to filter all the way through the local area network's firewall. After it is in the system, the harm it is able to cause can range from stealthily appropriating confidential information to wilful spoliation.
Besides the matters in re active content, merely browsing the Internet leaves a trail of the user's activities in the browser's history. This might be used by websites and installed software to create an exact profile of the user's behaviour and interests. Although this may be unacceptable as an invasion of privacy by some, it can be constructive by offering appropriate subject matter directly, thus exonerating the user of the chore of trying to find it.
Confidentiality is a matter that worries not only browser users but also Web Masters and Network Administrators during the actual transmission of data by means of the Internet. TCP/IP (Transmission Control Protocol/Internet Protocol) is the fundamental language of communication for the Internet. When it was created, security was not the most essential aspect of its design. Both network and Internet transmissions should therefore not be considered as necessarily private. Every time the browser on a local machine downloads a confidential file from the remote Web server, or the browser user completes a form with personal information and clicks the 'Submit' button, the transmitted data can be intercepted without authorization.
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