The system must use initial TCP sequence numbers most resistant to sequence number guessing attacks.

From SOLARIS 10 SPARC SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: ECSC-1

Associated with: CCI-001436

SV-27416r1_rule The system must use initial TCP sequence numbers most resistant to sequence number guessing attacks.

Vulnerability discussion

One use of initial TCP sequence numbers is to verify bidirectional communication between two hosts, which provides some protection against spoofed source addresses being used by the connection originator. If the initial TCP sequence numbers for a host can be determined by an attacker, it may be possible to establish a TCP connection from a spoofed source address without bidirectional communication.

Check content

# grep "TCP_STRONG_ISS=2" /etc/default/inetinit If this variable is not set, this is a finding.

Fix text

Edit /etc/default/inetinit and set the TCP_STRONG_ISS parameter to 2.

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