Vulnerability Details : CVE-2017-17688
The OpenPGP specification allows a Cipher Feedback Mode (CFB) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL. NOTE: third parties report that this is a problem in applications that mishandle the Modification Detection Code (MDC) feature or accept an obsolete packet type, not a problem in the OpenPGP specification
Products affected by CVE-2017-17688
- cpe:2.3:a:microsoft:outlook:2007:*:*:*:*:*:*:*
- cpe:2.3:a:apple:mail:-:*:*:*:*:*:*:*
- cpe:2.3:a:apple:mail:-:*:*:*:*:iphone_os:*:*
- cpe:2.3:a:mozilla:thunderbird:-:*:*:*:*:*:*:*
- cpe:2.3:a:horde:horde_imp:-:*:*:*:*:*:*:*
- cpe:2.3:a:roundcube:webmail:-:*:*:*:*:*:*:*
- cpe:2.3:a:bloop:airmail:-:*:*:*:*:*:*:*
- cpe:2.3:a:emclient:emclient:-:*:*:*:*:*:*:*
- cpe:2.3:a:flipdogsolutions:maildroid:-:*:*:*:*:*:*:*
- cpe:2.3:a:freron:mailmate:-:*:*:*:*:*:*:*
- cpe:2.3:a:postbox-inc:postbox:-:*:*:*:*:*:*:*
- cpe:2.3:a:r2mail2:r2mail2:-:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2017-17688
0.84%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 80 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2017-17688
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:N/A:N |
8.6
|
2.9
|
NIST | |
|
5.9
|
MEDIUM | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
2.2
|
3.6
|
NIST |
References for CVE-2017-17688
-
https://twitter.com/matthew_d_green/status/995996706457243648
Matthew Green on Twitter: "So in summary, PGP clients are vulnerable because 17 years after a vulnerability was known, the mitigation was not made a default in GnuPG and defense was instead “left to PThird Party Advisory
-
https://lists.gnupg.org/pipermail/gnupg-users/2018-May/060334.html
Efail press releaseThird Party Advisory
-
https://news.ycombinator.com/item?id=17066419
Let's summarize the situation: Abstract: S/MIME and MUAs are broken. OpenPGP (... | Hacker NewsIssue Tracking;Third Party Advisory
-
http://flaked.sockpuppet.org/2018/05/16/a-unified-timeline.html
Third Party Advisory
-
https://www.synology.com/support/security/Synology_SA_18_22
Synology Inc.Third Party Advisory
-
https://protonmail.com/blog/pgp-vulnerability-efail
No, PGP is not broken, not even with the Efail vulnerabilities - ProtonMail BlogIssue Tracking;Third Party Advisory
-
http://www.securityfocus.com/bid/104162
OpenPGP CVE-2017-17688 Man In The Middle Information Disclosure VulnerabilityThird Party Advisory;VDB Entry
-
http://www.securitytracker.com/id/1040904
OpenPGP CFB Mode Authentication Flaw Lets Remote Users Decrypt and Obtain Potentially Sensitive Information from the Target User's Email Client - SecurityTrackerThird Party Advisory;VDB Entry
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https://www.patreon.com/posts/cybersecurity-15-18814817
Cybersecurity Roundup: May 15, 2018 | Violet Blue on PatreonIssue Tracking;Third Party Advisory
-
https://efail.de
EFAILExploit;Mitigation;Third Party Advisory
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