From the web page
"Active alert verification is a technique designed to reduce the false
positive rate of IDSs by actively probing for a vulnerability
associated with detected attacks. If the vulnerability corresponding
to a detected attack is found to exist in the host or network against
which the attack was directed, the alert is generated, invoking any
logging and response functions as normal. If, however, the
vulnerability is determined not to exist, the alert is considered a
false positive and is suppressed."
This is a lot like what Psionic ( now cisco ) does -
http://newsroom.cisco.com/dlls/corp_102202.html.
What is the first thing attackers do after compromising a host? They
patch the flaw they entered through in order to maintain control and
not lose the system in the same manner.
Automated attack tools and kits make this process extremely expedient
and are likely to result in the real events being suppressed by the
infrastructure you trust to let you know about the problem. I've been
witness to this failure on many occasion and can only recommend
against any reliance on this and similar methodologies.
The approach is fundamentally flawed from a security perspective.
Nothing about the target host, as reported by itself, can be trusted
post attack; if there were a real compromise.
On 12/28/06, John Hally <JHally@epnet.com> wrote:
Hello All,
I stumbled upon SnortAV recently, which looks to be integration of Nessus to
attempt to verify alerts and actual vulnerabilities to raise priority. It
looks as though the project is stalled. Is that the case? Has anyone had
any experience with it? It seems like a really cool concept, almost a poor
man's RNA.
Thoughts?
Thanks!
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