Debian Security Update DSA-5728-1 exim4 - security update

[LinuxBot]

Phillip Szelat discovered that Exim, a mail transport agent, does not properly parse a multiline RFC 2231 header filename, allowing a remote attacker to bypass a $mime_filename based extension-blocking protection mechanism.
https://security-tracker.debian.org/tracker/DSA-5728-1

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