PHP2Shell: From Flaw to Fix

PHP2Shell exposed how failures in a widely used web runtime can become code execution and secret theft. For builders and technically curious learners, this course explains the memory bugs, discovery timeline, AI-assisted research, exploitation evidence and practical verification of fixes.

4 sections · 14 lessons

Course outline

Impact and exposure

  1. What PHP2Shell puts at risk
  2. The runtime beneath your website
  3. What the exposure numbers mean
  4. Severity is not exploit probability

Memory failures

  1. One worker serves many requests
  2. When memory exhaustion breaks cleanup
  3. State that outlives its request
  4. Why server configuration changes exploitability
  5. Diagnose a broken request boundary

Discovery and disclosure

  1. From warning to working exploit
  2. What AI changed in the research
  3. An embargo under pressure
  4. Attempts are not confirmed breaches

Fixing the system

  1. What the patches actually change
  2. Proving the fix is running
  3. Close Harbor’s remediation gaps

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