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ISC2 Certified Secure Software Lifecycle Professional (CSSLP) Practice Question

During threat modeling for a cloud document-sharing service, you identify a misuse case: an attacker uploads malware disguised as "report.pdf.exe" to bypass extension filtering. Which security requirement most effectively mitigates this threat before the file is stored?

  • The system must limit each upload to a maximum of 25 MB to conserve storage resources.

  • The application must inspect the file header (magic number) to confirm it matches the declared MIME type before accepting the upload.

  • All uploaded files must be encrypted at rest using AES-256 within one hour of storage.

  • The platform must enforce TLS 1.2 or higher for all client connections.

ISC2 Certified Secure Software Lifecycle Professional (CSSLP)
Secure Software Requirements
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