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Date: Mon, 25 Mar 2024 11:12:56 +0100
From: Salvatore Bonaccorso <carnil@...ian.org>
To: oss-security@...ts.openwall.com
Subject: Re: GNU emacs 29.3 released to fix security issues
Hi,
On Sun, Mar 24, 2024 at 09:05:20AM -0700, Alan Coopersmith wrote:
> https://lists.gnu.org/archive/html/info-gnu/2024-03/msg00005.html reports:
>
> > Version 29.3 of Emacs, the extensible text editor, should now
> > be available from your nearest GNU mirror:
> >
> > https://ftpmirror.gnu.org/emacs/emacs-29.3.tar.xz
> > https://ftpmirror.gnu.org/emacs/emacs-29.3.tar.gz[...]
> > Emacs 29.3 is an emergency bugfix release; it includes no new features
> > except a small number of changes intended to resolve security
> > vulnerabilities uncovered in Emacs 29.2. See the file etc/NEWS in the
> > tarball; you can view it from Emacs by typing 'C-h n', or by clicking
> > Help->Emacs News from the menu bar.
> >
> > You can also browse NEWS on-line using this URL:
> >
> > https://git.savannah.gnu.org/cgit/emacs.git/tree/etc/NEWS?h=emacs-29
> >
> > For the complete list of changes and the people who made them, see the
> > various ChangeLog files in the source distribution. For a summary of
> > all the people who have contributed to Emacs, see the etc/AUTHORS
> > file.
> >
> > For more information about Emacs, see:
> > https://www.gnu.org/software/emacs
>
> https://git.savannah.gnu.org/cgit/emacs.git/tree/etc/NEWS?h=emacs-29
> lists these changes:
>
> > * Changes in Emacs 29.3
> > Emacs 29.3 is an emergency bugfix release intended to fix several
> > security vulnerabilities described below.
> >
> > ** Arbitrary Lisp code is no longer evaluated as part of turning on Org mode.
> > This is for security reasons, to avoid evaluating malicious Lisp code.
> >
> > ** New buffer-local variable 'untrusted-content'.
> > When this is non-nil, Lisp programs should treat buffer contents with
> > extra caution.
> >
> > ** Gnus now treats inline MIME contents as untrusted.
> > To get back previous insecure behavior, 'untrusted-content' should be
> > reset to nil in the buffer.
> >
> > ** LaTeX preview is now by default disabled for email attachments.
> > To get back previous insecure behavior, set the variable
> > 'org--latex-preview-when-risky' to a non-nil value.
> >
> > ** Org mode now considers contents of remote files to be untrusted.
> > Remote files are recognized by calling 'file-remote-p'.
>
> The detailed changelogs are at:
> https://git.savannah.gnu.org/cgit/emacs.git/tree/ChangeLog.4?h=emacs-29
Related to this there is as well an org-mode update:
https://list.orgmode.org/87o7b3eczr.fsf@bzg.fr/T/#t
quoting that post:
> I just released Org mode 9.6.23 that fixes several critical
> vulnerabilities. The release is coordinated with emergency Emacs 29.3
> release
> (https://lists.gnu.org/archive/html/info-gnu/2024-03/msg00005.html).
>
> Please upgrade your Org mode *and* Emacs ASAP.
>
> The vulnerabilities involve arbitrary Elisp and LaTeX evaluation when
> previewing attachments in Emacs or when opening third-party Org files.
>
> The arbitrary Elisp evaluation is fixed by this release.
>
> The fix for LaTeX evaluation requires Emacs 29.3 and will not work for
> the earlier Emacs versions. If upgrading Emacs is not viable, as a
> workaround, you can set `org-preview-latex-default-process' to 'verbatim
> - this will disable LaTeX previews and avoid the vulnerability.
I believe CVE assignments are yet missing. RedHat folks, can you
assign CVEs as needed for the individual emacs and org-mode issues?
Regards,
Salvatore
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