On Fri, 24 Jan 2014 09:42:04 -0500
"dan (ddp)" <[email protected]> wrote:

> On Fri, Jan 24, 2014 at 9:38 AM, Bruno Andrade <[email protected]>
> wrote:
> > On Fri, 24 Jan 2014 07:50:25 -0500
> > "dan (ddp)" <[email protected]> wrote:
> >
> >> On Fri, Jan 24, 2014 at 5:41 AM, Bruno Andrade <[email protected]>
> >> wrote:
> >> > Hey, I have a doubt about update file signatures to the
> >> > database..
> >> >
> >> > Basically I have installed OSSEC Hids and the webUI. On the
> >> > webUI, I go integrity checking->Dump database and I check the
> >> > last modified files. I click the file and I see the old
> >> > signature and new one.
> >> >
> >> > If I now that change is legitimate, how can I update database to
> >> > use the new file signature and don't alert about that change?
> >> >
> >>
> >> If the signature is in the database, the alert should have already
> >> been triggered.
> >
> > I think you don't fully understand my question.
> >
> > Basically, I have this:
> >
> > /etc/gshadow-   md5 <old_signature>
> >                 sha1 <old_signature>
> >                 ->
> >                 md5 <new_signature>
> >                 sha1 <new_signature>
> >
> > So, I know that /etc/gshadow file has been changed because
> > maintenance in the system and not an attack.
> > I think the <old_signature> still in the database, and it will be
> > triggering the alert every time it analysis the file. So, how can I
> > update the signature for the file to use the <new_signature>?
> >
> >
> 
> I think the database keeps some older copies of the signatures, but
> it's not supposed to check them.
> 
> If you don't think it is working properly, open a ticket. I'll try to
> test it out later.

Hey, that's not what I thinking.

Lets restart... I install OSSEC, he generate file signatures, I change
a file, OSSEC trigger an alarm for that file because the signature
change. What happens now?

Thanks.


-- 
Bruno Andrade <[email protected]>
Programador (I&D)
Eurotux Informática, S.A. | www.eurotux.com
(t) +351 253 680 300 (m) +351 936 293 858

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