Re: [Xen-devel] severe security issue on dom0/xend/xm/non-root users

[Tommi Virtanen <tv@xxxxxxxxxxxxx>]

Rik van Riel wrote:
> Note that I do not believe that xend access should be root
> only, people may want to run management software under another
> UID.  As long as domain 0 doesn't get any untrusted users,
> things should be fine.
That's not good design. I sincerely think access to any confidential
or security conscious part of xen should be limited, e.g. with a
unix domain socket located in a directory only readable by a certain
group.

If any user in dom0 can do sensitive xm operations, a security bug
in _any_ dom0 networked app allows the attacker to gain remote root.
That is, (xen trusts every user in dom0) implies (in dom0, all security
vulnerabilities give access to root).

Note that if there are harmless xm commands (xm list and so on), they
could be allowed for all users in dom0.


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