From: Luís Miguel Silva (lms_at_ispgaya.pt)
Date: Fri 06 Feb 2004 - 21:44:46 GMT
As the exploit been published?
A Sex, 2004-02-06 às 21:33, Herbert Poetzl escreveu:
> Hello Folks!
>
> because the last security fix for the chmod()/chroot()
> issue was a little too fast, and a little too secure
> for some distros (debian was mentioned), this release
> restricts the security to the 'important' parts, the
> vserver directory.
>
> this is done in the following way:
>
> the chroot() 000 barrier is unaffected and unchanged,
> but in addition to that, a barrier with IUNLINK set
> can not be changed (chmod()), so the exploit isn't
> possible on such a secured system.
>
> What you have to do, after applying that patch?
>
> chmod 000 /vservers
> chattr +t -d /vservers
>
> all-in-one and broken out patches for 2.4.24 as well
> as incremental patches are available at
>
> http://www.13thfloor.at/vserver/s_release/
>
> a temporary fix for the chmod()/chroot() exploit is
> to make the vserver directory immutable, but that
> will affect vserver creation and destruction in
> various ways, so an upgrade is advised.
>
> best,
> Herbert
>
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