Headline

CVE-2019-14664: Enigmail / Bugs / #984 Leak encrypted emails by replying to benign looking mails

In Enigmail below 2.1, an attacker in possession of PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted part(s) can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the intended receiver. If the receiver replies to this (benign looking) email, he unknowingly leaks the plaintext of the encrypted message part(s) back to the attacker. This attack variant bypasses protection mechanisms implemented after the “EFAIL” attacks.

5 years ago

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#984 Leak encrypted emails by replying to benign looking mails

Status: fixed

Owner: nobody

Labels: None

Found in Version: 2.0.10

Severity: Major

Thunderbird version:

GnuPG version:

Operating System: All

Fixed in version: 2.0.11

Cc: nobody

Updated: 2019-07-03

Created: 2019-04-30

Private: No

Related to bug #983 (partially signed), a variant of leaking the plaintext of PGP encrypted messages by replying to a benign looking email still works with the PGP/Inline wrapping trick. Note that multiple (hundreds) of encrypted mail can be wrapped and thereby leaked at once. Also, every captured PGP/MIME message can be “downgraded” to be interpreted in the context of a PGP/Inline message.

Related

Bugs: #984
Bugs: #985
Bugs: #995
Forum: Enigmail no longer displays unencrypted part of message

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