From: Dor Azouri <dor.azouri@safebreach.com>
To: Noam Postavsky <npostavs@users.sourceforge.net>
Cc: 28618@debbugs.gnu.org
Subject: bug#28618: Emacs Security Issue
Date: Fri, 29 Sep 2017 12:57:06 +0000 [thread overview]
Message-ID: <CALVPaFYR+BeuVFjQXAiKK0gUfpN5wW37C5Y9kY8U4za68k2Mbg@mail.gmail.com> (raw)
In-Reply-To: <87efqrf4k3.fsf@users.sourceforge.net>
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Hi,
This is the output in my env that demonstrates how it works (forgive the
hebrew chars):
*~/.emacs.d$ ls -all*
total 20
drwx------ 2 duke duke 4096 ספט 28 20:24 .
drwxr----- 105 duke duke 16384 ספט 28 14:36 ..
*~/.emacs.d$ echo '(let ((default-directory "/opt/")) (shell-command "touch
stub.file"))' > init.el*
*~/.emacs.d$ ls -all /opt/ | grep stub.file*
*~/.emacs.d$ sudo emacs*
*~/.emacs.d$ ls -all /opt/ | grep stub.file*
-rw-r--r-- 1 root root 0 ספט 28 20:25 stub.file
*~/.emacs.d$ rm /opt/stub.file *
rm: remove write-protected regular empty file ‘/opt/stub.file’? yes
rm: cannot remove ‘/opt/stub.file’: Permission denied
*~/.emacs.d$ sudo rm /opt/stub.file *
*~/.emacs.d$ ls -all /opt/ | grep stub.file*
*duke@nukem:~/.emacs.d$ sudo ls -all /root/.emacs*
ls: cannot access /root/.emacs: No such file or directory
My env:
GNU Emacs 25.3.2 (tested with old version 23 as well)
Ubuntu 14.04, Kernel 4.13.0
Tested and works as well on Ubuntu 16.04 with emacs24.
Best,
Dor Azouri
On Thu, Sep 28, 2017 at 2:25 PM Noam Postavsky <
npostavs@users.sourceforge.net> wrote:
> tags 28618 + unreproducible
> quit
>
> Dor Azouri <dor.azouri@safebreach.com> writes:
>
> > Reproduction steps:
> > ===================
> > 1) Add the following ELisp line of code to the init file. It will be
> > loaded on startup and execute the command “touch /stub.file”, when “~
> > /.emacs.d/” is the working directory.
> > (let ((default-directory "~/.emacs.d/")) (shell-command
> > "touch /stub.file"))
> > 2) Wait for the user to invoke Emacs in elevated mode. The owner of
> > the newly created stub file is root.
>
> As Glenn noted, this doesn't actually work: 'sudo emacs' uses
> /root/.emacs, not ~/.emacs.
>
> ~$ sudo id
> uid=0(root) gid=0(root) groups=0(root)
> ~$ echo '(let ((default-directory "~/.emacs.d/")) (shell-command "touch
> /stub.file"))' > .emacs
> ~$ emacs # *Messages* has "touch: cannot touch '/stub.file': Permission
> denied"
> ~$ ls /stub.file
> ls: cannot access '/stub.file': No such file or directory
> ~$ sudo emacs
> ~$ ls /stub.file
> ls: cannot access '/stub.file': No such file or directory
>
>
>
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next prev parent reply other threads:[~2017-09-29 12:57 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-27 13:56 bug#28618: Emacs Security Issue Dor Azouri
2017-09-27 15:44 ` John Wiegley
2017-09-27 16:02 ` Dor Azouri
2017-09-27 16:23 ` Andreas Schwab
2017-09-27 17:24 ` Glenn Morris
2017-09-27 18:03 ` Glenn Morris
2017-09-28 11:25 ` Noam Postavsky
2017-09-29 12:57 ` Dor Azouri [this message]
2017-09-29 13:24 ` Noam Postavsky
2017-09-29 16:41 ` Glenn Morris
2017-09-29 22:55 ` Noam Postavsky
2017-10-01 15:27 ` Dor Azouri
2017-10-06 2:23 ` Noam Postavsky
2018-03-17 1:43 ` Noam Postavsky
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