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Date: Thu, 16 Jul 2015 18:34:11 -0400 (EDT)
From: cve-assign@...re.org
To: carnil@...ian.org
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com
Subject: Re: CVE Request: kmail: Attachments are not encrypted when "automatic encryption" is selected

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> It was reported a while ago to the KDE Bugtracking System, that
> attachments are not encrypted when "automatic encryption" is selected.
> 
> Upstream bugreport: https://bugs.kde.org/show_bug.cgi?id=340312
> Fix: http://quickgit.kde.org/?p=kdepim.git&a=commit&h=626c857eb30c0533a4de7836ee843caaa8c00a26
> Debian Bug: https://bugs.debian.org/791800

Use CVE-2014-8878.

Other comments (probably irrelevant):

This general type of issue has been included in CVE before: see
CVE-2014-5369.

We feel that it is conceivable that this kmail behavior had been
intentional. Encrypting attachments to arbitrary recipients, simply
because a PGP key is known, has a usability problem. Some mail systems
automatically and silently remove attachments that can't be scanned
for malware (e.g., when the pre-encryption content type of the
attachment is one that can have malware). This has, in some sense, a
risk of "data corruption" because the meaning of a message can be
vastly different if the attachment doesn't arrive. If the sender
explicitly selects the "encrypt message" option, then that's a very
strong signal that encryption is required, and kmail did encrypt
attachments in that case. The "automatic encryption" implementation
might have made a different tradeoff between security and usability.
But, probably not. We decided to assign a CVE ID anyway because the
commit refers to the change as a bug fix, because there was apparently
no documentation of an intentional tradeoff, and because we're unaware
of any widespread acceptance of a need to avoid encrypted attachments
in some cases.

- -- 
CVE assignment team, MITRE CVE Numbering Authority
M/S M300
202 Burlington Road, Bedford, MA 01730 USA
[ PGP key available through http://cve.mitre.org/cve/request_id.html ]
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