While this would be an alternative, I assume protecting from this authentication bypass vulnerability with a signature is difficult, maybe even impossible as there - as far as I understand the securityadvisory - isn't some 'malicious' in the traffic that can be blocked. The traffic looks like a normal authentication request and the problem (the vulnerability) is that PAN-OS does not correctly verify the signature of the SAML assertion.
So if you are affected, do not wait and install the update as soon as possible or make sure the option "Validate Identity Provider Certificate" is enabled.
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