GNU bug report logs - #3712
23.1.50; SECURITY: Tramp creates -rwxrwxrwx permission files with /su and /sudo method

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From: help-debbugs <at> gnu.org (Emacs bug Tracking System)
To: Teemu Likonen <tlikonen <at> iki.fi>
Subject: bug#3712: marked as done (23.1.50; SECURITY: Tramp creates
 -rwxrwxrwx permission files with /su and /sudo method)
Date: Tue, 30 Jun 2009 16:40:05 +0000

[Message part 1 (text/plain, inline)]

Your message dated Tue, 30 Jun 2009 19:36:32 +0300
with message-id <878wj9fzlb.fsf <at> iki.fi>
and subject line Re: bug#3712: 23.1.50; SECURITY: Tramp creates -rwxrwxrwx permission files with /su and /sudo method
has caused the Emacs bug report #3712,
regarding 23.1.50; SECURITY: Tramp creates -rwxrwxrwx permission files with /su and /sudo method
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
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immediately.)


-- 
3712: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3712
Emacs Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Teemu Likonen <tlikonen <at> iki.fi>
To: emacs-pretest-bug <at> gnu.org
Subject: 23.1.50; SECURITY: Tramp creates -rwxrwxrwx permission files with /su and /sudo method
Date: Mon, 29 Jun 2009 18:16:30 +0300

When method /su: or /sudo: is used to _create_ a file the file's
permission will be set to -rwxrwxrwx (777), that is, allow everything
for everyone. Obviously this is serious security bug. Steps to
reproduce:

 1. Start Emacs as a normal user:

        emacs -Q

 2. Create a file in a directory to which the user who launched this
    Emacs session doesn't have write access.

        C-x C-f /su::/root/test.txt

 3. Write some content to the file and save it with "C-x C-s".

 4. Check file's permissions. It has 777 permission bits:

        $ ls -l /root/test.txt
        -rwxrwxrwx 1 root root 5 2009-06-29 17:58 /root/test.txt

For some reason, if I create similar file to the same user's home
directory who launched this Emacs session (/su::$HOME/test.txt) then it
gets 644 permissions (probably honoring umask settings).


In GNU Emacs 23.1.50.4 (i686-pc-linux-gnu, GTK+ Version 2.12.12)
 of 2009-06-29 on mithlond
Windowing system distributor `The X.Org Foundation', version 11.0.10402000
configured using `configure  '--prefix=/home/dtw/local''

[Message part 3 (message/rfc822, inline)]

From: Teemu Likonen <tlikonen <at> iki.fi>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 3712-done <at> debbugs.gnu.org
Subject: Re: bug#3712: 23.1.50; SECURITY: Tramp creates -rwxrwxrwx permission files with /su and /sudo method
Date: Tue, 30 Jun 2009 19:36:32 +0300

On 2009-06-30 17:34 (+0200), Michael Albinus wrote:

> OK, you've convinced me. Execution bits are removed now for newly
> created remote files.

> If it works also for you it is OK for me.

It seems to work perfectly now. Huge thanks! I'm happy to close this
bug.

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