Medium severity · published May 16, 2018
CVE-2017-17688
The OpenPGP specification allows a Cipher Feedback Mode (CFB) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL
5.9
CVSS
5.4%
EPSS
No
On KEV
Description
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
CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)5.4% · higher than 93% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OU
Outlook · Microsoft
2007 · source: NVD
AI
Airmail · Bloop
All versions, or not specified · source: NVD
EM
Emclient · Emclient
All versions, or not specified · source: NVD
HI
Horde Imp · Horde
All versions, or not specified · source: NVD
MA
Mail · Apple
All versions, or not specified · source: NVD
MA
Maildroid · Flipdogsolutions
All versions, or not specified · source: NVD
MA
Mailmate · Freron
All versions, or not specified · source: NVD
PO
Postbox · Postbox-inc
All versions, or not specified · source: NVD
R2
R2mail2 · R2mail2
All versions, or not specified · source: NVD
TH
Thunderbird · Mozilla
All versions, or not specified · source: NVD
WE
Webmail · Roundcube
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-17688
CVE.org
https://www.cve.org/CVERecord?id=CVE-2017-17688
Third Party Advisory
http://flaked.sockpuppet.org/2018/05/16/a-unified-timeline.html
Third Party Advisory
http://www.securityfocus.com/bid/104162
Third Party Advisory
http://www.securitytracker.com/id/1040904
Exploit
https://efail.de
Third Party Advisory
https://lists.gnupg.org/pipermail/gnupg-users/2018-May/060334.html
Issue Tracking
https://news.ycombinator.com/item?id=17066419
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