The operating system must use organization-defined replay-resistant authentication mechanisms for network access to non-privileged accounts.

From Apple OS X 10.8 (Mountain Lion) Workstation STIG

Associated with: CCI-000776

SV-65729r1_rule The operating system must use organization-defined replay-resistant authentication mechanisms for network access to non-privileged accounts.

Vulnerability discussion

An authentication process resists replay attacks if it is impractical to achieve a successful authentication by recording and replaying a previous authentication message. Techniques used to address this include protocols using challenges (e.g., TLS, WS_Security), time synchronous, or challenge-response one-time authenticators.

Check content

To check which protocol is configured for sshd, run the following: grep ^Protocol /etc/sshd_config | awk '{ print $2 }' If there is no result or the result is not "2" this is a finding.

Fix text

In order to make sure that "Protocol 2" is used by sshd, run the following command: sudo sed -i.bak 's/.*Protocol.*/Protocol 2/' /etc/sshd_config

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