lkml.org 
[lkml]   [2005]   [Jan]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] OpenBSD Networking-related randomization port
    On Fri, Jan 28, 2005 at 06:47:55PM +0100, Lorenzo Hernández García-Hierro wrote:
    > El vie, 28-01-2005 a las 18:40 +0100, Adrian Bunk escribió:
    > > On Fri, Jan 28, 2005 at 06:17:17PM +0100, Lorenzo Hernández García-Hierro wrote:
    > > >...
    > > > As it's impact is minimal (in performance and development/maintenance
    > > > terms), I recommend to merge it, as it gives a basic prevention for the
    > > > so-called system fingerprinting (which is used most by "kids" to know
    > > > how old and insecure could be a target system, many time used as the
    > > > first, even only-one, data to decide if attack or not the target host)
    > > > among other things.
    > > >...
    > >
    > > "basic prevention"?
    > > I hardly see how this patch makes OS fingerprinting by e.g. Nmap
    > > impossible.
    >
    > That's an example, as you can find at the grsecurity handbook [1]:
    >...
    > "Randomized IP IDs hinders OS fingerprinting and will keep your machine
    > from being a bounce for an untraceable portscan."
    >...

    The OS detection in Nmap [1], which is AFAIK the most popular port
    scanner today works by e.g. checking the answer of an ACK to a closed
    port.

    I do still not understand how your patch has any impact on these issues.

    > Cheers,
    >...

    cu
    Adrian

    [1] http://www.insecure.org/nmap/nmap-fingerprinting-article.html

    --

    "Is there not promise of rain?" Ling Tan asked suddenly out
    of the darkness. There had been need of rain for many days.
    "Only a promise," Lao Er said.
    Pearl S. Buck - Dragon Seed

    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 14:09    [W:0.023 / U:0.692 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site