Re: Reproducers for recent Emacs security issues

[Max Nikulin]

On 16/04/2024 20:23, Andrew Cohen wrote:
>      EZ> Maybe I misunderstand something (I don't use Gnus), but isn't it
>      EZ> a security problem that the presence of such a line in an email
>      EZ> message causes Emacs to download a remote file?
>
> It doesn't cause the file to be downloaded immediately---it displays a
> message identifying downloading the file as a possible security risk,
> and requires confirmation in order to proceed with the download. This
> seems OK from the security viewpoint.

The dialog was introduced in Org mode 9.6 while Emacs-28.2 (the version 
in Debian stable) has Org 9.5. Moreover, Emacs before 29.3 had a bug, 
and attempts to fetch remote file happened even when users declined 
requests. (I do not think, user experience would be great in the case of 
a message having a dozen of #+setupfile lines...)

> But this is what 'gnus-article-emulate-mime is supposed to do:
> it consults a list of regular expressions to match and invokes handlers
> to deal with them (whether the article is mime or not).

I did not figure out at first that it is not an attachment that 
activates Org mode for message body.

However almost certainly it is incorrect that in the case of

#+startup: latexpreview
\begin{equation}
x = 1
\end{equation}

`org-mode' is invoked just for
---- 8< ----
#+startup: latexpreview
\begin{equation}
---- >8 ----

I am in doubts if the intention is to highlight just the #+startup line 
or rest of the body.

If a message contains just #+startup without immediately following 
\begin{equation} then Org mode does not tries if latex command is 
available and it is even more confusing.