Publications (6)0.96 Total impact
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ABSTRACT: Many popular and well-established cyber security Capture the Flag (CTF) exercises are held each year in a variety of settings, including universities and semiprofessional security conferences. CTF formats also vary greatly, ranging from linear puzzle-like challenges to team-based offensive and defensive free-for-all hacking competitions. While these events are exciting and important as contests of skill, they offer limited educational opportunities. In particular, since participation requires considerable a priori domain knowledge and practical computer security expertise, the majority of typical computer science students are excluded from taking part in these events. Our goal in designing and running the MIT/LL CTF was to make the experience accessible to a wider community by providing an environment that would not only test and challenge the computer security skills of the participants, but also educate and prepare those without an extensive prior expertise. This paper describes our experience in designing, organizing, and running an education-focused CTF, and discusses our teaching methods, game design, scoring measures, logged data, and lessons learned.Proceedings of the 4th conference on Cyber security experimentation and test; 08/2011
Article: The Real Cost of Software Errors[Show abstract] [Hide abstract]
ABSTRACT: Software is no longer creeping into every aspect of our lives - it's already there. In fact, failing to recognize just how much everything we do depends on software functioning correctly makes modern society vulnerable to software errors.IEEE Security and Privacy Magazine 05/2009; · 0.96 Impact Factor
Conference Paper: Securing Current and Future Process Control Systems.[Show abstract] [Hide abstract]
ABSTRACT: Process control systems (PCSs) are instrumental to the safe, reliable and efficient operation of many critical infrastructure components. However, PCSs increasingly employ commodity information technology (IT) elements and are being connected to the Internet. As a result, they have inherited IT cyber risks, threats and attacks that could affect the safe and reliable operation of infrastructure components, adversely affecting human safety and the economy. This paper focuses on the problem of securing current and future PCSs, and describes tools that automate the task. For current systems, we advocate specifying a policy that restricts control network access and verifying its implementation. We further advocate monitoring the control network to ensure policy implementation and verify that network use matches the design specifications. For future process control networks, we advocate hosting critical PCS software on platforms that tolerate malicious activity and protect PCS processes, and testing software with specialized tools to ensure that certain classes of vulnerabilities are absent prior to shipping. Full Text at Springer, may require registration or feeCritical Infrastructure Protection, Post-Proceedings of the First Annual IFIP Working Group 11.10 International Conference on Critical Infrastructure Protection, Dartmouth College, Hanover, New Hampshire, USA, March 19-21, 2007; 01/2007
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ABSTRACT: Abstract Computer attacks can cripple major software systems and cost billions of dollars in dam- age by exploiting vulnerabilities in software. One type of vulnerability, the buer overflow, is common,in low-level languages like C that do not have built-in bounds-checking. Modified compilers are available to add bounds-checking to C applications, but a major part of the problem remains: how can a program survive the bug or attack and continue providing its service? Failure-oblivious computing helps an attacked program continue execution by cre- ating an illusion of correct memory,accesses. While failure-oblivious computing techniques can prevent exploits, the nature of the techniques can still cause programs to terminate pre- maturely or to produce incorrect results. We attempt to create new and improved heuristics that enhance programs’ ability to continue executing through buer,overflow vulnerabili- ties and other memory,errors while attempting to sacrifice as little correctness of results as possible.
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ABSTRACT: Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005. This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections. Includes bibliographical references (p. 143-146). The research presented in this thesis aims to improve existing approaches to dynamic buffer overflow detection by developing a system that utilizes code instrumentation and adaptive test case synthesis to find buffer overflows and corresponding failure-inducing inputs automatically. An evaluation of seven modern dynamic buffer overflow detection tools determined that C Range Error Detector (CRED) is capable of providing fine-grained buffer access information necessary for the creation of this system. CRED was also selected because of its ability to provide comprehensive error reports and compile complex programs with reasonable performance overhead. CRED was extended to provide appropriate code instrumentation for the adaptive testing system, which also includes a test case synthesizer that uses data perturbation techniques on legal inputs to produce new test cases, and an analytical module that evaluates the effectiveness of these test cases. Using information provided by code instrumentation in further test case generation creates a feedback loop that enables a focused exploration of the input space and faster buffer overflow detection. Applying the adaptive testing system to jabberd, a Jabber Instant Messaging server, demonstrates its effectiveness in finding buffer overflows and its advantages over existing dynamic testing systems. (cont.) Adaptive test case synthesis using CRED to provide buffer access information for feedback discovered 6 buffer overflows in jabberd using only 53 messages, while dynamic testing using random messages generated from a protocol description found only 4 overflows after sending 10,000 messages. by Michael A. Zhivich. M.Eng.
Article: Dynamic Buffer Overflow Detection[Show abstract] [Hide abstract]
ABSTRACT: The capabilities of seven dynamic buer overflow detec- tion tools (Chaperon, Valgrind, CCured, CRED, Insure++, ProPolice and TinyCC) are evaluated in this paper. These tools employ dierent approaches to runtime buer over- flow detection and range from commercial products to open- source gcc-enhancements. A comprehensive testsuite was developed consisting of specifically-designed test cases and model programs containing real-world vulnerabilities. In- sure++, CCured and CRED provide the highest buer over- flow detection rates, but only CRED provides an open-source, extensible and scalable solution to detecting buer over- flows. Other tools did not detect o-by-one errors, did not scale to large programs, or performed poorly on complex programs.