Computer-Related Risks by Peter G. Neumann

By Peter G. Neumann

In keeping with information accumulated via the writer as a part of ACM's foreign hazards discussion board, this ebook includes money owed of mishaps attributed to desktops and the folk utilizing them--some funny, and a few tragic. Neumann characterizes other kinds of computer-related hazards, discusses hazard explanations and results, and considers their implications. He additionally indicates how you can reduce dangers sooner or later.

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The relationship between the JVM bytecode language and Java, and deriving sufficient, effectively checkable conditions on the bytecode to ensure that Java semantics are always upheld, is a major open problem in Java security today. Of course, complete formal specifications of both the JVM and Java are needed first. 6 Analysis We found a number of interesting problems in an alpha version of HotJava, and various commercial versions of Netscape Navigator and Microsoft Internet Explorer. More instructive than the particular bugs we and others have found is an analysis of their possible causes.

The first role does not demand any extra security, as we expect the operating system to treat applications written in Java just like any other application, and we trust that the operating system’s security policy will be enforced. Web applets, however, cannot be trusted with the full authority granted to a given user, and so require that Java define and implement a protected subsystem with an appropriate security policy. 2 Enforcement The Java SecurityManager is intended to be a reference monitor [Lam71].

ClassLoader. 5. 36 is a public class with a public constructor that adds an additional stack frame, making the applet’s constructor be the fifth stack frame, not the fourth, on the stack. If Netscape had used their stack inspection-based permission model for this security check, the problem would not have occurred. However, LaDue was unable to break the type system directly, because Netscape was identifying types correctly by (name, ClassLoader) pairs, not just names. AppletClassLoader. subclass of AppletClassLoader implemented a final method for the upcall from the JVM to the ClassLoader, so we were unable to intercept name lookups.

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