From: domg472@gmail.com (Dominick Grift)
Date: Mon, 21 Feb 2011 15:07:50 +0100
Subject: [refpolicy] [patch 1/1] sudo: Fixes for sudo,
	handle /var/db/sudo
In-Reply-To: <4D62706E.9090801@redhat.com>
References: <4D5EA91C.1080409@redhat.com> <1298092089.3101.51.camel@tesla.lan>
	<4D62706E.9090801@redhat.com>
Message-ID: <4D6271B6.8020105@gmail.com>
To: refpolicy@oss.tresys.com
List-Id: refpolicy.oss.tresys.com

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On 02/21/2011 03:02 PM, Daniel J Walsh wrote:
> On 02/19/2011 12:08 AM, Guido Trentalancia wrote:
>> Hello Miroslav !
> 
>> On Fri, 18/02/2011 at 17.15 +0000, Miroslav Grepl wrote:
>>> http://mgrepl.fedorapeople.org/F15/admin_sudo.patch
>>>
>>>      * Allow sudo to send signals to any domains the user could have 
>>> transitioned to.
>>>      * Handle /var/db/sudo
>>>      * Allow users to run executables in /tmp or ~/
> 
>> To the best of my knowledge, the first part of the last change is
>> something really bad from a security point of view. 
> 
>> System administrators put much effort to avoid that (such as
>> mounting /tmp with noexec, nosuid options) !
> 
>> A legitimate user does not need to store his/her executables in /tmp, as
>> he/she has at least its own home directory available for that (and if
>> he/she cannot write there, then he/she is probably over quota).
> 
>> /tmp just "potentially provides storage space for malicious
>> executables" (quoted from paragraph 2.2.1.3 of NSA public document
>> "Guide to the Secure Configuration of Red Hat Enterprise Linux 5"
>> Revision 4, but any decent web search engine would easily provide you
>> with tons of pages relative to the cries of those whom have allowed that
>> sort of thing to happen on their systems).
> 
>> Regards,
> 
>> Guido
> 
>> _______________________________________________
>> refpolicy mailing list
>> refpolicy at oss.tresys.com
>> http://oss.tresys.com/mailman/listinfo/refpolicy
> 
> +	userdom_domtrans_user_tmp($1_sudo_t, $3)
> 
> Says to run user_tmp_t files as staff_t, Which is the equivalent of if
> the staff_t had executed the file directly.
> 
> I guess if execution of homedir/tmp dir was turned off this could be
> seen as a priv escalation.

refpolicy does not have the above functionality afaik.

> staff_t is not allowed to execute user_tmp_t, but it can if it goes
> through sudo.
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