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Your encrypted email messages might not be that secure after all

15 May 2018, 04:22 | Francis Delgado

PGP is leaking plain text versions of your emails and there's no known fix

PGP is leaking your emails in plaintext and there's no known fix

A paper detailing the vulnerability, co-authored by Sebastian Schinzel, computer security professor at the M√ľnster University of Applied Sciences in Germany, is available online. The email encryption vulnerability was first reported by the Electronic Frontier Foundation (EFF) on Monday.

A post on EFF's website says that users of PGP, which stands for "Pretty Good Privacy", should "pause" their use until the vulnerability is fixed.

Once altered, the encrypted email can be sent back to the victim's email client, which will mistakenly decrypt the contents inside and send the information to the attacker's server via a URL request. It will be safer for the users to switch to services like Signal, the massaging app backed by WhatsApp co-founder Brian Acton.

The vulnerability has been named "efail", but many researcher believe the issue has been overblown. In contrast, mainstream email clients simply process and store your messages using plain text. They also advised users to stop using the encryption tools S/MIME and OpenPGP.

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The research is focused on how popular HTML-based email platforms - like Mozilla's Thunderbird, Apple's Mail, and Microsoft Outlook - continue to mishandle specific, internal configurations within email.

Schinzel also urged users via Twitter to visit the blog posts by the EFF, which includes detailed step-by-step guides on how to disable PGP in Outlook, Apple Mail, and Thunderbird. "They might reveal the plaintext of encrypted emails, including encrypted emails sent in the past". The PGP CFB gadget attack was assigned CVE-2017-17688, while the S/MIME CBC vulnerability was given CVE-2017-17689. They say the PGP and S/MIME standards need an update, but that "will take some time".

Asking his online community if any of the members use PGP, responses ranged from "LOL, no" to "Most don't even know what that is" to a member saying he set up PGP, but no client has ever wanted to use the encryption option. The importance of email encryption went mainstream after whistleblower Edward Snowden revealed the extent of the USA government's electronic surveillance in 2013. Hacker House cofounder and Brit infosec pro Matthew Hickey told The Register while we're unlikely to see widespread abuse of EFAIL, the potential for targeted attacks against journalists, corporations, activists, and academics makes it worth taking seriously.

Mikko Hypponen of F-Secure, a cyber security firm, said: "This is bad because the people who use PGP use it for a reason, people don't use it for fun - people who use it have real secrets, like business secrets or confidential things". Security experts recommend to remove them immediately, so hackers are unable to read correspondence.



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