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Security Engineering

How to Automatically Fix AWS IAM Wildcard Policies

June 20, 2026 Postura Security Labs 7 min read

IAM wildcard policy statements (e.g. Action: "*" or Principal: "*") represent a severe privilege escalation vector in AWS. Finding these policies is easy, but automatically fixing them without breaking application code requires active logic verification.

The Wildcard Privilege Escalation Threat

When a policy grants wildcard permissions to anonymous or external accounts, it effectively bypasses IAM authorization boundaries. An attacker who gains control of any session inside that boundary can execute administrative API actions like creating users, access keys, or modifying existing policies.

Using Z3 SMT Solver for Policy Safety

PosturaNet models IAM policy rules as mathematical logic statements. Using the Z3 theorem prover, we verify the policy against safety invariants:

# Logic: NOT (WildcardPrincipal AND DangerousAction)
solver.add(p_wildcard == has_wildcard)
solver.add(p_dangerous == has_dangerous)
solver.add(Or(Not(p_wildcard), Not(p_dangerous)))
assert solver.check() == sat

Automated Remediation & GitOps

When the SMT solver proves that a wildcard configuration is unsafe, PosturaNet automatically:

  • Synthesizes a minimal-privilege HCL policy replacement.
  • Opens a GitOps pull request targeting your Terraform repositories.
  • Enables rollback tracking to revert changes instantly if active monitoring detects routing errors.

This closed-loop automated verification allows startups to meet SOC 2 Type II audit requirements continuously without requiring a full-time DevSecOps engineering team.