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The security issues for Web applications are normally constrained to the following scenarios: Protecting the client How do we protect a client host with Internet access from hackers that could exploit bugs in the browser or any browser plug-ins What do we expose to a legitimate server Can servers infer anything about us that we wish to keep private Can servers extract information about other sites visited or extract email or address information previously presented to other sites What are the risks of running active content from other sources What levels of access does the browser permit to the underlying operating system Protecting the connection.

In a typical consultation, the expert system would ask the user to enter facts about the problem, and the expert system would output the recommendation in text form Today, of course, graphical, high-resolution displays are the norm (most typically displayed on a PC), and so a wider variety of user interfaces are possible For example, an expert system that runs a nuclear power plant might contain a graphical control panel that contains dials, switches, alerts, graphs, and various other displays to help an operator run and monitor the nuclear power plant Another option, which we will explore more fully in the next chapter, is the creation of diagrammatic representations that a user can interactively explore and manipulate We look at some varieties of diagrammatic user interfaces that can make expert systems more transparent and exible to use.

How should we protect the communications channel between browser and server Can attackers intercept, delete, modify, or add information to a valid communication Can the session be hijacked Even if the connection is secure, can the endpoints of communication be exploited before requests or responses are delivered Preventing denial of service Can we prevent attackers from completely disrupting communication between our application and all legitimate users If unavoidable, can this situation be mitigated in some manner Protecting the server.

ifications of physical layer information to high-level application analysis of reassembled packets from fragments using knowledge of the syntax of the data (for example, recognizing a command to delete all files on a UNIX host). Systems can come with a predefined filter and signature set installed or can provide full programming support for custom signature definition. IDS configuration requires us to be very knowledgeable about networking protocols used to get a good idea of what normal traffic looks like. Intrusion analysts must be able to separate false positives (which are nonattacks reported by the IDS) from actual attacks. Tools such as tcpdump can filter and capture IP packets for analysis and help us create signatures for attacks. A packet might depart from the standard IP networking protocol definitions in some particular way. It could be:

How do we protect the Web server from unauthorized access How do we restrict authorized access Can confidential data be stolen from the server Does the server host other services that could compromise Web security What vulnerabilities can a vendor s Web server extensions present to the world What are the risks of uploading content or processing requests for services from clients What levels of access does the server permit to the underlying operating system Protecting the services hidden behind the Web server What do application servers in the middle tier reveal Can Web server connections to enterprise middleware architectures such as Java servlets, CORBA services, EJB, or dynamically generated HTML be protected from abuse How do we prevent Web.

9/21/05

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While certain aspects of the old schema were retained, the schema was refactored to make it more exible and maintainable (see Figure 9.2). In moving from DBMS to Symbian SQL, data compatibility was broken and this gave an opportunity to improve the schema, removing some of the earlier peculiarities (such as separate Contacts and Identity tables).