CVE-2017-17689

NameCVE-2017-17689
DescriptionThe S/MIME specification allows a Cipher Block Chaining (CBC) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium
Debian Bugs898633, 899127, 899128

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
evolution (PTS)jessie3.12.9~git20141130.241663-1vulnerable
jessie (security)3.12.9~git20141130.241663-1+deb8u1vulnerable
stretch (security), stretch3.22.6-1+deb9u2vulnerable
buster3.30.5-1.1vulnerable
bullseye, sid3.34.1-2vulnerable
kdepim (PTS)jessie4:4.14.1-1+deb8u1vulnerable
jessie (security)4:4.14.1-1+deb8u2vulnerable
stretch4:16.04.3-4~deb9u1vulnerable
kf5-messagelib (PTS)stretch4:16.04.3-3~deb9u1vulnerable
bullseye, sid, buster4:18.08.3-2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
evolutionsource(unstable)(unfixed)unimportant898633
kdepimsource(unstable)(unfixed)899128
kf5-messagelibsource(unstable)4:18.08.1-1899127

Notes

[stretch] - kf5-messagelib <no-dsa> (Defaults to secure handling, change to disable it entirely can be fixed via spu)
[stretch] - kdepim <no-dsa> (Defaults to secure handling, change to disable it entirely can be fixed via spu)
[jessie] - kdepim <no-dsa> (Defaults to secure handling, change to disable it entirely can be fixed via spu)
https://efail.de
https://bugzilla.gnome.org/show_bug.cgi?id=796135
https://dot.kde.org/2018/05/15/efail-and-kmail
protocol vulnerability can't be fixed in implementations but they can prevent exploitation by disabling loading of remote content
kmail bug is #898634, but src:kmail is not affected, the code in question is in kf5-messagelib
kf5-messagelib: https://phabricator.kde.org/D12391 (v18.04.1)
kf5-messagelib: https://phabricator.kde.org/D12393 (v18.04.1)
kmail: https://phabricator.kde.org/D12394

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