ISC2 Systems Security Certified Practitioner (SSCP) Practice Question
An e-commerce company runs its public website on Amazon EC2 instances behind an Application Load Balancer (ALB). A recent penetration test reports exposure to the BEAST attack because the ALB still negotiates SSLv3 and TLS 1.0 with CBC ciphers. Which change will most effectively remediate this weak protocol implementation without requiring application code changes?
Reconfigure the architecture so TLS is terminated on each EC2 instance while the ALB operates in TCP passthrough mode.
Replace the current RSA server certificate with an Elliptic Curve certificate while leaving protocol support unchanged.
Enable HTTP/2 on the ALB so the client and server communicate over a newer application layer protocol.
Apply an AWS managed security policy on the ALB that disables SSLv3 and TLS 1.0 and allows only TLS 1.2 with strong ciphers.
The BEAST attack exploits weaknesses in SSLv3 and early versions of TLS that rely on CBC-mode ciphers. The simplest remediation is to prevent the use of these legacy protocol versions and weak ciphers during the TLS handshake. Selecting an AWS predefined security policy that supports only TLS 1.2 (or newer) and strong cipher suites forces every client connection to use secure algorithms, eliminating BEAST exposure. Enabling HTTP/2 does not guarantee older protocols are disabled. Merely swapping to an ECC certificate keeps vulnerable protocols available if the ALB still offers them. Moving TLS termination to the instances retains the same weak protocols unless they, too, are reconfigured and adds operational overhead, so it is not the most direct fix.
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ISC2 Systems Security Certified Practitioner (SSCP)
Cryptography
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