https://arstechnica.com/information-technology/2019/06/millions-of-machines-affected-by-command-execution-flaw-in-exim-mail-server/
By Dan Goodin
Ars Technica
6/6/2019
Millions of Internet-connected machines running the open source Exim mail
server may be vulnerable to a newly disclosed vulnerability that, in some
cases, allows unauthenticated attackers to execute commands with all-powerful
root privileges.
The flaw, which dates back to version 4.87 released in April 2016, is trivially
exploitable by local users with a low-privileged account on a vulnerable system
running with default settings. All that's required is for the person to send an
email to "${run{...}}@localhost," where "localhost" is an existing local domain
on a vulnerable Exim installation. With that, attackers can execute commands of
their choice that run with root privileges.
The command execution flaw is also exploitable remotely, albeit with some
restrictions. The most likely scenario for remote exploits is when default
settings have been made such as:
[...]
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