DETECTION OF JIT SPRAYING BY FLASH WITH AN ACTIONSCRIPT EMULATOR
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United States of America Patent
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Issued Date -
May 1, 2014
app pub date -
Nov 1, 2012
filing date -
Nov 1, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Methods and systems for detecting JIT spraying by ActionScript bytecode (ABC) contained within a Flash file are provided. According to one embodiment, an ActionScript emulator receives a Flash file to be tested. The emulator implements a modified version of an operator typically implemented by an ActionScript virtual machine. The emulator reveals one or more tagged data blocks (tags) contained within the Flash file by decoding the Flash file. The emulator determines whether the one or more tags are capable of containing ABC by evaluating the one or more tags. When an affirmative determination results with respect to a tag of the one or more tags, then the emulator interprets and executes the ABC associated with the tag. Responsive to observing one or more predetermined conditions by a detector implemented within the modified version of the operator, the emulator reports existence of JIT spraying functionality within the Flash file.
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