The SSH daemon must limit connections to a single session.

From AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: ECSC-1

Associated with: CCI-000054

SV-26776r1_rule The SSH daemon must limit connections to a single session.

Vulnerability discussion

The SSH protocol has the ability to provide multiple sessions over a single connection without reauthentication. A compromised client could use this feature to establish additional sessions to a system without consent or knowledge of the user.Alternate per-connection session limits may be documented if needed for a valid mission requirement. Greater limits are expected to be necessary in situations where TCP or X11 forwarding are used.

Check content

Check the SSH daemon configuration for the MaxSessions setting. # grep -i MaxSessions /etc/ssh/sshd_config | grep -v '^#' If the setting is not present, or not set to 1, this is a finding.

Fix text

Edit the SSH daemon configuration and add or edit the MaxSessions setting value to 1.

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