ID

VAR-201805-0228

CVE

CVE-2017-17689

TITLE

OpenPGP and S/MIME mail client vulnerabilities

DESCRIPTION

The S/MIME specification allows a Cipher Block Chaining (CBC) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL. In multiple mail clients OpenPGP and S/MIME A plaintext message may be leaked when decrypting the message. OpenPGP and S/MIME For e-mail clients that support, it is possible to establish a channel for sending plaintext by decrypting encrypted e-mail inserted with content crafted by an attacker with the user's e-mail client. The discoverer can attack with this vulnerability "CBC/CFB gadget attack" I call it. For example HTML image By inserting a tag, the decrypted message is HTTP It may be sent as part of the request. * *CVE-2017-17688: OpenPGP CFB Attacks * *CVE-2017-17689: S/MIME CBC Attacks Some email clients also use multipart MIME Because the message is not properly separated and processed, attackers can process encrypted mail in plain text. MIME It can be included in the part. in this case, CBC/CFB gadget attack The plaintext message may be sent without executing. Detail is, <a href="https://efail.de/efail-attack-paper.pdf" target="blank"> Articles provided by the discoverer </a> Please refer to.A remote attacker may obtain plaintext from encrypted mail without the key information required for decryption. An attacker can exploit this issue to perform man-in-the-middle attacks and obtain sensitive information. Successful exploits will lead to other attacks. S/MIME is a certificate implementation for email encryption. A security vulnerability exists in S/MIME. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 - ------------------------------------------------------------------------- Debian Security Advisory DSA-4244-1 security@debian.org https://www.debian.org/security/ Moritz Muehlenhoff July 13, 2018 https://www.debian.org/security/faq - ------------------------------------------------------------------------- Package : thunderbird CVE ID : CVE-2017-17689 CVE-2018-5188 CVE-2018-12359 CVE-2018-12360 CVE-2018-12362 CVE-2018-12363 CVE-2018-12364 CVE-2018-12365 CVE-2018-12366 CVE-2018-12372 CVE-2018-12373 CVE-2018-12374 Multiple security issues have been found in Thunderbird, which may lead to the execution of arbitrary code, denial of service or attacks on encrypted emails. For the stable distribution (stretch), these problems have been fixed in version 1:52.9.1-1~deb9u1. We recommend that you upgrade your thunderbird packages. For the detailed security status of thunderbird please refer to its security tracker page at: https://security-tracker.debian.org/tracker/thunderbird Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: debian-security-announce@lists.debian.org -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEtuYvPRKsOElcDakFEMKTtsN8TjYFAltI+2sACgkQEMKTtsN8 TjZXHRAAgOmSvTwwmmzxRH/4tSSpndZCFCtkHrG5PU5D3XesLGnWpNZk9aINsaU2 ih3fmEKzQgHHfAzK3d9TcGjyiI+PoVuWkVknsVqTrHd+xQtxUs7B/5Pfz5WKiYDJ QJ4NhjTgHHystYa0j2CvK28/ZoPVZgwnc/D051ChTInPWXimJI+TxpsndW/NPuaJ SphoPP34OMO2EARjrKCxiL6NRv6kD4CJv0AgoYfdO0qPXomuA8HpDAH1itd7GbRq yVJoZRnpz9dGjJSM5wyFCc1BIqmA/CMphhmqiRTuFBA+rOSEDblzfc2tg9t82CVQ caA7rF3VrYx8qmgpP3akCju+SDOEWLerFGHH1iaQ+GBqiXvduvMl/MSXCZmVZzIC 92Ko2m9kURkak4yKccEbHJ5Vh8i0oLUOc+Ee3MUUfWUblYbCcB4z34p9hRwc8u83 mmGUbsq+qWvdcd9NkekKC/ENQZt4Egb3doeEzqSkaa4uhFaQ1gGosHXGslNTCqLl 6RyeFON9Q5CWphQET+rmnlcJ8B1cSHgpG1ZTN6szlsQpiVgcRu/JYrgyzX9Y6WdY rAape6t+gsEeLOP7n9pZ/KYSadUF5CvYY/nX9H6kJO1RmG9y0A+8wAEuW+nSOMMJ vh2U09+y5XJHQqV0MMTKbnadxlyi8Oerc0zrYaoBuYhR7wmvkus= =R2OH -----END PGP SIGNATURE-----

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

encryption problem

CONFIGURATIONS

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Damian Poddebniak, Christian Dresen, Jens Muller, Fabian Ising, Sebastian Schinzel1, Simon Friedberger, Juraj Somorovsky, and Jorg Schwenk

SOURCES

LAST UPDATE DATE

2024-11-23T20:59:49.596000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE