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Date: Mon, 14 May 2018 10:29:52 +0200
From: Jakub Wilk <>
Subject: Re: PGP/MIME and S/MIME mail clients vulnerabilities has 
more details:

"[...] HTML is used as a back channel to create an oracle for modified 
encrypted mails.  It is long known that HTML mails and in particular 
external links like <img href=""/> are evil if the MUA 
actually honors them (which many meanwhile seem to do again; see all 
these newsletters).  Due to broken MIME parsers a bunch of MUAs seem to 
concatenate decrypted HTML mime parts which makes it easy to plant such 
HTML snippets."

Jakub Wilk

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