patch 9.0.2070: [security] disallow setting env in restricted mode Commit: https://github.com/vim/vim/commit/6b89dd6a7257a1e2e9c7ea070b407bc4674a5118 Author: Christian Brabandt <cb@256bit.org> Date: Thu Oct 26 22:14:17 2023 +0200 patch 9.0.2070: [security] disallow setting env in restricted mode Problem: [security] disallow setting env in restricted mode Solution: Setting environment variables in restricted mode could potentially be used to execute shell commands. Disallow this. restricted mode: disable allow setting of environment variables Setting environment variables in restricted mode, may have some unwanted consequences. So, for example by setting $GCONV_PATH in restricted mode and then calling the iconv() function, one may be able to execute some unwanted payload, because the `iconv_open()` function internally uses the `$GCONV_PATH` variable to find its conversion data. So let's disable setting environment variables, even so this is no complete protection, since we are not clearing the existing environment. I tried a few ways but wasn't successful :( One could also argue to disable the iconv() function completely in restricted mode, but who knows what other API functions can be influenced by setting some other unrelated environment variables. So let's leave it as it is currently. closes: #13394 See: https://huntr.com/bounties/b0a2eda1-459c-4e36-98e6-0cc7d7faccfe/ Signed-off-by: Christian Brabandt <cb@256bit.org>

.TH VIMTUTOR 1 "2001 April 2"
.SH NAME
vimtutor \- the Vim tutor
.SH SYNOPSIS
.br
.B vimtutor [\-g] [language]
.SH DESCRIPTION
.B Vimtutor
starts the
.B Vim
tutor.
It copies the tutor file first, so that it can be modified without changing
the original file.
.PP
The
.B Vimtutor
is useful for people that want to learn their first
.B Vim
commands.
.PP
The optional argument \-g starts vimtutor with gvim rather than vim, if the
GUI version of vim is available, or falls back to Vim if gvim is not found.
.PP
The optional [language] argument is the two-letter name of a language, like
"it" or "es".
If the [language] argument is missing, the language of the current locale will
be used.
If a tutor in this language is available, it will be used.
Otherwise the English version will be used.
.PP
.B Vim
is always started in Vi compatible mode.
.SH FILES
.TP 15
/usr/local/lib/vim/tutor/tutor[.language]
The
.B Vimtutor
text file(s).
.TP 15
/usr/local/lib/vim/tutor/tutor.vim
The Vim script used to copy the
.B Vimtutor
text file.
.SH AUTHOR
The
.B Vimtutor
was originally written for Vi by Michael C. Pierce and Robert K. Ware,
Colorado School of Mines using ideas supplied by Charles Smith,
Colorado State University.
E-mail: bware@mines.colorado.edu (now invalid).
.br
It was modified for
.B Vim
by Bram Moolenaar.
For the names of the translators see the tutor files.
.SH SEE ALSO
vim(1)