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Hi all

We just had a security investigation and one of the issues raised is that my routers and pix both show ssh version number, if you telnet to them on port 22. Apparently, this could help an attacker by providing information on the vendor and version of the server.

for example

Telnet router.com 22

SSH - 1, 99-Cisco-1: 25

Any ideas on how to avoid this?

Thanks in advance

Chris

Remote administration of network devices should only allow the IP address of the authorized staff and use the encrypted connection over untrusted network (e.g. internet). An ACL must be in place to allow the IP address of authorized personnel only. Know the version is irrelevant because they are the administrator of the unit.

If you do not put ACL to allow only authorized IP addresses, even if the version is NOT specified, it doesn't matter to the pirates.

Tags: Cisco Security

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