Automated detection of persistent kernel control-flow attacks

  • Authors:
  • Nick L. Petroni, Jr.;Michael Hicks

  • Affiliations:
  • University of Maryland: College Park, College Park, MD;University of Maryland: College Park, College Park, MD

  • Venue:
  • Proceedings of the 14th ACM conference on Computer and communications security
  • Year:
  • 2007

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Abstract

This paper presents a new approach to dynamically monitoring operating system kernel integrity, based on a property called state-based control-flow integrity (SBCFI). Violations of SBCFI signal a persistent, unexpected modification of the kernel's control-flow graph. We performed a thorough analysis of 25 Linux rootkits and found that 24 (96%) employ persistent control-flow modifications; an informal study of Windows rootkits yielded similar results. We have implemented SBCFI enforcement as part of the Xen and VMware virtual machine monitors. Our implementation detected all the control-flow modifying rootkits we could install, while imposing unnoticeable overhead for both a typical web server workload and CPU-intensive workloads when operating at 10 second intervals.