Ethereal-dev: Re: [Ethereal-dev] offtopic: Services and Protocols that unreveal much OS inform

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From: Gerald Combs <gerald@xxxxxxxxxxxx>
Date: Thu, 9 Jan 2003 11:04:16 -0600 (CST)
On Thu, 9 Jan 2003, skyper wrote:

> Does anyone know any other widely used Protocol/Service that leaks
> OS, host, vendor, arch, ... information?

SMTP and FTP spring to mind.  You might want to look at Nmap and Nessus.
Both projects use a wide variety of methods to remotely fingerprint OSes.