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Re: Session-ID randomness
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Re: Session-ID randomness


  • Subject: Re: Session-ID randomness
  • From: Chuck Hill <email@hidden>
  • Date: Mon, 24 Mar 2014 17:57:54 +0000
  • Thread-topic: Session-ID randomness

Hi Markus,

I think the session ID is pretty strong so any attack will require a random session ID.  I’d rate the chances of success as low.  To be extra sure, capture the originating IP, user agent, etc from the request that starts a session.  If those ever change, kill the session as a preventative measure.

And as someone else suggested, you can use Apache to block this IP or user agent from getting near your app.


Chuck


On 2014-03-24, 3:08 AM, "Markus Stoll, junidas GmbH" wrote:

Hi,

for quite some time someone is fireing on one of my customers WebObjects applications,
that very much looks like a bot net.

The firing occurs always on the same instance and the same WO action for each request, its
trying another session id. So this looks like someone is doing a brute force
attack to guess a valid session id.

So I am wondering: is there a known weakness in the randomness of generated session ids,
that is making this (guessing a valid session id) possible at all?

Regards, Markus

PS: the attacker is using this user agent: "Mozilla/5.0+(compatible;+AhrefsBot/5.0;++http://ahrefs.com/robot/)“
    they are obviously not respecting the robots.txt and the observed behaviour does not match
    the expected behaviour for a crawler/bot


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 >Re: ERXObjectStoreCoordinator dispose not releasing database connection? (From: John Pollard <email@hidden>)

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