The yamanner worm that infested Yahoo Mail last week was quickly squashed. In the 24-hour period it thrived, though, the worm provided a glimpse of what's in store for Internet users unless companies apply strict measures when building Web applications with techniques such as Ajax. The worm exploited a weakness related to JavaScript, which is a key component of Ajax, a set of technologies being used more frequently for interactive Web applications. That's what made last week's worm worrisome. Ajax can be used securely but without careful, designed-in security. Web apps using it open additional doors to writers of malicious code.
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