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Network Security Firewalls
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x.25 link running HDLC does not need firewall?

Subject: x.25 link running HDLC does not need firewall?
Date: 25 Aug 2004 19:29:25 -0000


You gurus out there please kindly enlighten me on whether we need a firewall 
for this scenario and if so, what product would support this:
The bank I work for has a x.25 HDLC serial point to point link to a stock 
exchange.  The link is via leased lines provided by a vendor, which goes 
through 2 telecom exchanges between us and destination.  The connection between 
our application server (solaris 2.6) and the stock exchange is initiated by us. 
 This application server is connected to the rest of my internal network via 
tcp/ip. This solaris server is not hardened.

Without a firewall in between the stock exchange and my application server, 
would there be a way an attacker from the stock exchange, or from the telco 
line vendor, could potentially hack into my solaris box or tunnel through to my 
internal tcp/ip lan?  Any specific examples would be greatly appreciated!

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