A Linux administrator is hardening a server based on a recent security audit report. The report mandates the removal of all weak and deprecated cryptographic protocols to mitigate known vulnerabilities. Which of the following should the administrator prioritize for disablement?
SSLv3
SHA-256
TLS 1.3
AES-256-GCM
The correct answer is SSLv3. The SSLv3 protocol is deprecated and has significant known vulnerabilities, most notably the POODLE (Padding Oracle On Downgraded Legacy Encryption) attack. This vulnerability allows an attacker to decrypt sensitive information from within an encrypted session. Modern security standards require that SSLv3 be disabled. TLS 1.3 is the latest and most secure version of the Transport Layer Security protocol and should be enabled, not disabled. AES-256-GCM is a strong, modern, and widely recommended authenticated encryption cipher. SHA-256 is a secure hashing algorithm from the SHA-2 family and is a current standard for many applications, such as digital signatures.
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