Securing the VOS Telnet Daemon

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Summary Scanners see an open port � TCP Wrappers Yes � -local_ip Yes (but only on selected interface) � SSH Tunnels No • Requires client to connect to localhost • Will require key setup to skip password prompt � IPSec No • Requires separately shipped and priced software � Don’t remove telnet from <strong>the</strong> services file 24
Questions? a = b a^2 = a*b a^2-b^2 = a*b-b^2 (a+b)(a-b) = b(a-b) (a+b) = b a+a = a 2a = a 2 = 1 25
Page 1 and 2: Securing the VOS Telnet Daemon Noah
Page 3 and 4: Background - why is the Telnet daem
Page 5 and 6: Restricting connections with TCP Wr
Page 11 and 12: Selective listening with -local_ip
Page 13 and 14: Using SSH tunnels � When using an
Page 15 and 16: Using SSH tunnels C Telnetd Port 23
Page 17 and 18: Using SSH tunnels � Scanners will
Page 19 and 20: Using IPSec � ipsec.conf file •
Page 21 and 22: Using IPSec spd[2] spd index = 2 sa
Page 23: What not to do � Do not remove (o

Securing the VOS Telnet Daemon

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