NDLI: Measuring channel capacity to distinguish undue influence

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Measuring channel capacity to distinguish undue influence

Content Provider	ACM Digital Library
Author	Song, Dawn McCamant, Stephen Newsome, James
Abstract	The channel capacity of a program is a quantitative measure of the amount of control that the inputs to a program have over its outputs. Because it corresponds to worst-case assumptions about the probability distribution over those inputs, it is particularly appropriate for security applications where the inputs are under the control of an adversary. We introduce a family of complementary techniques for measuring channel capacity automatically using a decision procedure (SAT or #SAT solver), which give either exact or narrow probabilistic bounds. We then apply these techniques to the problem of analyzing false positives produced by dynamic taint analysis used to detect control-flow hijacking in commodity software. Dynamic taint analysis is based on the principle that an attacker should not be able to control values such as function pointers and return addresses, but it uses a simple binary approximation of control that commonly leads to both false positive and false negative errors. Based on channel capacity, we propose a more refined quantitative measure of influence, which can effectively distinguish between true attacks and false positives. We use a practical implementation of our influence measuring techniques, integrated with a dynamic taint analysis operating on x86 binaries, to classify tainting warnings produced by vulnerable network servers, such as those attacked by the Blaster and SQL Slammer worms. Influence measurement correctly distinguishes real attacks from tainting false positives, a task that would otherwise need to be done manually.
Starting Page	73
Ending Page	85
Page Count	13
File Format	PDF
ISBN	9781605586458
DOI	10.1145/1554339.1554349
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2009-06-15
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Quantitative information flow Channel capacity Model counting
Content Type	Text
Resource Type	Article

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