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Avast Antivirus: X.509 Error Rendering Command Execution

Avast will render the commonName of X.509 certificates into an HTMLLayout frame when your MITM proxy detects a bad signature. Unbelievably, this means CN="<h1>really?!?!?</h1>" actually works, and is pretty simple to convert into remote code execution. To verify this bug, I've attached a demo certificate for you. Please find attached …

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