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The second of the two attacks discovered by Major Malfunction and Ben Laurie in February 1997 works against Microsoft's Internet Explorer browser, but not Netscape Unlike the minor Steal This IP Address problem, this problem is much more disturbing On their Web page, wwwalcryptocouk/java/, Major Malfunction and Ben Laurie claim "this loophole allows an attacker to connect to any TCP/IP port on the client's machine" That's a bit of an overstatement, but interesting information about listening ports can be gathered (for possible later use), which may leave a firewalled host more susceptible to standard TCP/IPbased attacks And that's bad news The Java Security Manager usually disallows port-scanning behavior, but the crackers use the well-known trick of sticking some Java code (in this case, a port scanner) in the browser's cache and later executing it through a file: URL (using frames in the usual way).

Recent measurements of local-area and wide-area traf c [14, 22, 28] have shown that network traf c exhibits variability at a wide range of scales. Such scale-invariant variability is in strong contrast to traditional models of network traf c, which show variability at short scales but are essentially smooth at large time scales; that is, they lack long-range dependence. Since self-similarity is believed to have a signi cant impact on network performance [2, 15, 16], understanding the causes and effects of traf c self-similarity is an important problem. In this chapter, we study a mechanism that induces self-similarity in network traf c. We show that self-similar traf c can arise from a simple, high-level property of the overall system: the heavy-tailed distribution of le sizes being transferred over the network. We show that if the distribution of le sizes is heavy tailed meaning that the distribution behaves like a power law thus generating very large le transfers with nonnegligible probability then the superposition of many le transfers in a client=server network environment induces self-similar traf c, and this causal

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card should be viewed as a small load to bear to enhance security sufficiently to protect the privacy of identity, financial, or medical information. The token card concept, once sufficient infrastructure is in place, could also be used to verify identity and authenticate users over the telephone with human or automated voice interactive systems. The token card s time-randomized number can be entered as easily over a touch-tone phone as it can be on a computer keyboard. You can imagine the prospect of a two-factor token card to raise the level of security on debit and credit cards. For example, perhaps transactions up to $500 could work in the conventional fashion, with just the secret PIN used, and any amount over that would require authentication with the PIN and the random string from the token card. Even ordering by telephone could be facilitated with an authentication entry using touch-tone phones to enter the number string from the token card. With a proper deployment strategy, a token card could substantially reduce the risk of doing online transaction by preventing misuse of identity data even if it were stolen or compromised. If token cards were required for all highvalue transactions, the compromised identity data without the token string would be useless. Certainly, consumer would appreciate that benefit.

Self-Similar Network Traf c and Performance Evaluation, Edited by Kihong Park and Walter Willinger ISBN 0-471-31974-0 Copyright # 2000 by John Wiley & Sons, Inc.

This attack works because Microsoft's cache layout is transparent This is an interesting variation on the Slash and Burn attack described on page 153 The attackers cheat a bit for demonstration purposes by having the patsy clear his or her cache, but even without this exercise, guessing the cache location (one of four possibilities) would not be all that much of a challenge Contrary to their claim, however, Java security rules are no longer relaxed for code loaded out of the cache (unless the cache happens to be in the CLASSPATH, which is not recommended) That problem was fixed in the upgrade to JDK 102 (Yet another reason that the Slash and Burn attack is obsolete) In any case, Microsoft apparently places HTML and class files in the same directory stored with their original names (remember, a Java class will only run if it is correctly named).

mechanism is robust with respect to changes in network resources (bottleneck bandwidth and buffer capacity), topology, interference from cross-traf c with dissimilar traf c characteristics, and changes in the distribution of le request interarrival times Properties of the transport=network layer in the protocol stack are shown to play an important role in mediating this causal relationship The mechanism we propose is motivated by the on=off model [28] The on=off model shows that self-similarity can arise in an idealized context that is, one with independent traf c sources and unbounded resources as a result of aggregating a large number of 0=1 renewal processes whose on or off periods are heavy tailed.

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