Note that, for example, a HTTP server on port 80 identifying itself
$ httptype togaware.com
Apache/1.3.29 (Debian GNU/Linux) PHP/4.3.3
or a SSH server on port 22 identifying itself as:
$ telnet togaware.com 22
Connected to togaware.com.
Escape character is '^]'.
SSH-1.99-OpenSSH_3.6.1p2 Debian 1:3.6.1p2-10
is not really a security risk. Serious attacks will attempt all know
vulnerabilities of the port, irrespective of what is running behind
the port. Thus this is not regarded as sensitive information. On the
other-hand, hiding the banner loses a lot for inter-operation.
Indeed, software should advertise its version number to aid debugging
in all kinds of circumstances. If there's a security flaw then the
flaw should be fixed instead of trying to hide it.
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