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Fundamental Challenges in Cybersecurity and a Philosophy of Vulnerability-Guided Hardening

Marcel Böhme

TL;DR

The paper tackles the problem that achieving universal security guarantees for complex software is fundamentally unattainable. It presents a theory of cybersecurity that attributes exploitable flaws to inherent limits in how we define, reason about, and trust software systems, supported by diverse, concrete examples. To address these limits, it proposes vulnerability-guided hardening and counterexample-guided meta verification as a practical, iterative framework to continually improve defenses and formal assurances. By grounding the philosophy in adversarial testing and vulnerability discovery, the authors provide a path toward more robust tooling and verification processes that evolve with new evidence and attacks. The work aims to shift from seeking final proofs to embracing a structured, evidence-driven cycle of proving, breaking, and reformulating security guarantees with broad sociotechnical considerations.

Abstract

Research in cybersecurity may seem reactive, specific, ephemeral, and indeed ineffective. Despite decades of innovation in defense, even the most critical software systems turn out to be vulnerable to attacks. Time and again. Offense and defense forever on repeat. Even provable security, meant to provide an indubitable guarantee of security, does not stop attackers from finding security flaws. As we reflect on our achievements, we are left wondering: Can security be solved once and for all? In this paper, we take a philosophical perspective and develop the first theory of cybersecurity that explains what precisely and *fundamentally* prevents us from making reliable statements about the security of a software system. We substantiate each argument by demonstrating how the corresponding challenge is routinely exploited to attack a system despite credible assurances about the absence of security flaws. To make meaningful progress in the presence of these challenges, we introduce a philosophy of cybersecurity.

Fundamental Challenges in Cybersecurity and a Philosophy of Vulnerability-Guided Hardening

TL;DR

The paper tackles the problem that achieving universal security guarantees for complex software is fundamentally unattainable. It presents a theory of cybersecurity that attributes exploitable flaws to inherent limits in how we define, reason about, and trust software systems, supported by diverse, concrete examples. To address these limits, it proposes vulnerability-guided hardening and counterexample-guided meta verification as a practical, iterative framework to continually improve defenses and formal assurances. By grounding the philosophy in adversarial testing and vulnerability discovery, the authors provide a path toward more robust tooling and verification processes that evolve with new evidence and attacks. The work aims to shift from seeking final proofs to embracing a structured, evidence-driven cycle of proving, breaking, and reformulating security guarantees with broad sociotechnical considerations.

Abstract

Research in cybersecurity may seem reactive, specific, ephemeral, and indeed ineffective. Despite decades of innovation in defense, even the most critical software systems turn out to be vulnerable to attacks. Time and again. Offense and defense forever on repeat. Even provable security, meant to provide an indubitable guarantee of security, does not stop attackers from finding security flaws. As we reflect on our achievements, we are left wondering: Can security be solved once and for all? In this paper, we take a philosophical perspective and develop the first theory of cybersecurity that explains what precisely and *fundamentally* prevents us from making reliable statements about the security of a software system. We substantiate each argument by demonstrating how the corresponding challenge is routinely exploited to attack a system despite credible assurances about the absence of security flaws. To make meaningful progress in the presence of these challenges, we introduce a philosophy of cybersecurity.
Paper Structure (25 sections, 1 figure, 1 algorithm)

This paper contains 25 sections, 1 figure, 1 algorithm.

Table of Contents

  1. Introduction
  2. Background
  3. Science of Security
  4. Generating Reliable Statements about Software Security
  5. What is a secure software system?
  6. Attacks.
  7. Defenses.
  8. A Theory of Guarantees in Cybersecurity
  9. Challenges to Distinguish Secure from Insecure Software
  10. Which line? Unknown unknowns.
  11. Drawing the line (operationalization).
  12. Challenges Of Reasoning About Cybersecurity
  13. Assumptions.
  14. Abstractions.
  15. Non-Universal claims.
  16. ...and 10 more sections

Figures (1)

  • Figure 1: Overview of the identified challenges to make reliable statements about the security of a software system.