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Date:      Thu, 24 Feb 2000 18:36:50 -0800
From:      tom brown <tomb@cgf.net>
To:        "A. Rakukin" <rakukin@mail.ru>
Cc:        freebsd-questions@FreeBSD.ORG, freebsd-security@FreeBSD.ORG
Subject:   Re: X authorization
Message-ID:  <38B5EAC2.5063CC6@cgf.net>
References:  <E12O4Et-0001Zs-00@f4.mail.ru>

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"A. Rakukin" wrote:

> Hi to all,
>
> Would be grateful for help or explanation. I used to think that by default
> nobody can run anything on my display. But now I revealed that it is enough
> to export DISPLAY on remote host to access my xserver. 'xhost' on the server
> (that has been accessed) says that
>
> access control enabled, only authorized clients can connect
>
> and nothing more. What is the possible source of the problem?
> I have not customized any authorization mechanisms...
> I run FreeBSD 3.4.
>
> Thank you,
> Alex
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
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If you are realy bothered by this you could apply IPFW filters to ports between
6000-6100 to prevent any connection to the X system.

I think that there is also a kerberos token based scheme of athentication.
I've never used it but details are at :
http://www.xfree86.org


If you want to know more about the vunerabilites of X:
http://packetstorm.securify.com/opensec-exploits/exploits/netapps/x-win/

Tom

Tom



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