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CVE-2017-17688 (GCVE-0-2017-17688)

Vulnerability from cvelistv5 – Published: 2018-05-16 19:00 – Updated: 2024-08-05 20:59 Disputed
VLAI
Summary
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
Severity
5.9 (Medium)
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • n/a
Assigner
References
Date Public
2018-05-16 00:00
Show details on NVD website
To clipboard 

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OpenPGP.\"}],\"metrics\":{\"cvssMetricV30\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.0\",\"vectorString\":\"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N\",\"baseScore\":5.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.2,\"impactScore\":3.6}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:M/Au:N/C:P/I:N/A:N\",\"baseScore\":4.3,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":8.6,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apple:mail:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"217117AE-C16C-4265-A9A9-152D06FCD64E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apple:mail:-:*:*:*:*:iphone_os:*:*\",\"matchCriteriaId\":\"081D62F6-B751-4109-B10B-3CF9535B3C12\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:bloop:airmail:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"F389CED1-846A-4807-B8E7-00FBECAA41A0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:emclient:emclient:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"930AFDDA-C32A-45E7-BA6E-5827E59B573B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:flipdogsolutions:maildroid:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"ED2616EA-332D-4D6E-B66C-137A166E181D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:freron:mailmate:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"2C26D918-1548-4A62-BC5C-72DF9168A34E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:horde:horde_imp:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FDAD39AA-B9FD-492B-9BDA-57F74F4FABE5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:outlook:2007:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"D789259A-034E-40BB-9DFF-76B3104B212F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:mozilla:thunderbird:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FF583CDC-DE9E-45AB-9861-CB203BFA8862\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:postbox-inc:postbox:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"C0BA111F-A9FB-457D-818E-412195F9EA0A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:r2mail2:r2mail2:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"19296516-EAD4-4B08-8D9A-5E853C7BEF58\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:roundcube:webmail:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"5010756A-99B8-4C05-9DAC-9BE19B8B6373\"}]}]}],\"references\":[{\"url\":\"http://flaked.sockpuppet.org/2018/05/16/a-unified-timeline.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"http://www.securityfocus.com/bid/104162\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\",\"VDB Entry\"]},{\"url\":\"http://www.securitytracker.com/id/1040904\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\",\"VDB Entry\"]},{\"url\":\"https://efail.de\",\"source\":\"cve@mitre.org\",\"tags\":[\"Exploit\",\"Mitigation\",\"Third Party Advisory\"]},{\"url\":\"https://lists.gnupg.org/pipermail/gnupg-users/2018-May/060334.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://news.ycombinator.com/item?id=17066419\",\"source\":\"cve@mitre.org\",\"tags\":[\"Issue Tracking\",\"Third Party Advisory\"]},{\"url\":\"https://protonmail.com/blog/pgp-vulnerability-efail\",\"source\":\"cve@mitre.org\",\"tags\":[\"Issue Tracking\",\"Third Party Advisory\"]},{\"url\":\"https://twitter.com/matthew_d_green/status/995996706457243648\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.patreon.com/posts/cybersecurity-15-18814817\",\"source\":\"cve@mitre.org\",\"tags\":[\"Issue Tracking\",\"Third Party Advisory\"]},{\"url\":\"https://www.synology.com/support/security/Synology_SA_18_22\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"http://flaked.sockpuppet.org/2018/05/16/a-unified-timeline.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"http://www.securityfocus.com/bid/104162\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\",\"VDB Entry\"]},{\"url\":\"http://www.securitytracker.com/id/1040904\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\",\"VDB Entry\"]},{\"url\":\"https://efail.de\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Mitigation\",\"Third Party Advisory\"]},{\"url\":\"https://lists.gnupg.org/pipermail/gnupg-users/2018-May/060334.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://news.ycombinator.com/item?id=17066419\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Issue Tracking\",\"Third Party Advisory\"]},{\"url\":\"https://protonmail.com/blog/pgp-vulnerability-efail\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Issue Tracking\",\"Third Party Advisory\"]},{\"url\":\"https://twitter.com/matthew_d_green/status/995996706457243648\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.patreon.com/posts/cybersecurity-15-18814817\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Issue Tracking\",\"Third Party Advisory\"]},{\"url\":\"https://www.synology.com/support/security/Synology_SA_18_22\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T16:40:18+00:00",
      "cve": "CVE-2017-17688",
      "id": "CVE-2017-17688",
      "initial_release_date": "2017-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "12",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "OpenPGP: CFB gadget attacks allows to exfiltrate plaintext out of encrypted emails",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2017/cve-2017-17688.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-03T00:57:36Z",
      "cve": "CVE-2017-17688",
      "id": "CVE-2017-17688",
      "initial_release_date": "2023-02-15T04:36:38Z",
      "product_status:known_not_affected": "232",
      "product_status:recommended": "23",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2017-17688",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2017-17688.json",
      "version": "15"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.