gather/external_ip: set Host header

[arno01]

http://ifconfig.me replies with 404 when Host header isn't set.

Related issue:
#9778

[arno01]

@smcintyre-r7 thanks for the hints! I pushed the changes. It is working for me.

[smcintyre-r7]

This is working for me now. Thanks alot for the patch!

msf6 payload(python/meterpreter/reverse_tcp) > use auxiliary/gather/external_ip 
msf6 auxiliary(gather/external_ip) > show options 

Module options (auxiliary/gather/external_ip):

   Name         Current Setting  Required  Description
   ----         ---------------  --------  -----------
   Proxies                       no        A proxy chain of format type:host:port[,type:host:port][...]
   REPORT_HOST  false            no        Add the found IP to the database
   RHOSTS       ifconfig.me      yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT        80               yes       The target port (TCP)
   SSL          false            no        Negotiate SSL/TLS for outgoing connections
   VHOST        ifconfig.me      no        HTTP server virtual host

msf6 auxiliary(gather/external_ip) > run
[*] Running module against 216.239.32.21

[+] Source ip to 216.239.32.21 is ###.###.217.159
[*] Running module against 216.239.38.21
[+] Source ip to 216.239.38.21 is ###.###.217.159
[*] Running module against 216.239.34.21
[+] Source ip to 216.239.34.21 is ###.###.217.159
[*] Running module against 216.239.36.21
[+] Source ip to 216.239.36.21 is ###.###.217.159
[*] Auxiliary module execution completed
msf6 auxiliary(gather/external_ip) > 

[adfoster-r7]

Release notes

Updated the modules/auxiliary/gather/external_ip module to provide a valid default VHOST setting.