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Re: Top 15 Reasons Why Admins Use Security Scanners
From: Jeremiah Cornelius <jeremiah () nur net>
Date: Wed, 28 Apr 2004 19:28:20 -0700

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On Wednesday 28 April 2004 15:35, nicolas vigier wrote:
you get too much false positive because nessus only
try to find the version and don't really test the vulnerability.
I think the right way to do it is to use a scanner which will use
an exploit to test the vulnerability. Unfortunately an exploit is
not always avaible for every vulnerability.

This depends on the individual NASL script.  Safe-checks only read banners, 
port combinations, etc.

There is nothing preventing a NASL check from mimicking exploit behavior.  For 
instance, some of the DoS checks are canned 'sploits.  There are unsafe SMTP 
checks that will send mail to a file in the /etc or /var/log hierarchies.  
This does not rely on banners, but behaviors.  You could adjust the NASL to 
do real harm to a vulnerable system.

True, Nessus doesn't run codes for a remote shell  against indications of of a 
buffer overflow.  That's when judicious manual checking is called for - where 
the tool leaves off.

Admins are in a privileged position to do these checks - as opposed to the 
pen-test auditor whos hand checks require adoption of invasive behavior.

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