ubuntu-cve-2020-14145
Vulnerability from osv_ubuntu
Published
2020-06-29 18:15
Modified
2025-08-01 04:52
Summary
Details

The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client). NOTE: some reports state that 8.5 and 8.6 are also affected.

Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
N/A (UNKNOWN)
low
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "openssh",
        "purl": "pkg:deb/ubuntu/openssh@1:6.6p1-2ubuntu2.13+esm2?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
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        "1:6.5p1-2",
        "1:6.5p1-3",
        "1:6.5p1-4",
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        "1:6.6p1-1",
        "1:6.6p1-2",
        "1:6.6p1-2ubuntu1",
        "1:6.6p1-2ubuntu2",
        "1:6.6p1-2ubuntu2.2",
        "1:6.6p1-2ubuntu2.3",
        "1:6.6p1-2ubuntu2.4",
        "1:6.6p1-2ubuntu2.6",
        "1:6.6p1-2ubuntu2.7",
        "1:6.6p1-2ubuntu2.8",
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        "1:6.6p1-2ubuntu2.12",
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        "1:6.6p1-2ubuntu2.13+esm2"
      ]
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    {
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        "name": "openssh",
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      },
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        "1:7.2p2-4ubuntu2.5",
        "1:7.2p2-4ubuntu2.6",
        "1:7.2p2-4ubuntu2.7",
        "1:7.2p2-4ubuntu2.8",
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        "1:7.2p2-4ubuntu2.10+esm1",
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        "1:7.2p2-4ubuntu2.10+esm3",
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        "1:7.2p2-4ubuntu2.10+esm5",
        "1:7.2p2-4ubuntu2.10+esm6",
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      ]
    },
    {
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        "name": "openssh",
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      },
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        "1:7.2p2-4ubuntu2.fips.2.4.1",
        "1:7.2p2-4ubuntu2.fips.2.4.2",
        "1:7.2p2-4ubuntu2.fips.2.8.1",
        "1:7.2p2-4ubuntu2.fips.2.10.1",
        "1:7.2p2-4ubuntu2.fips.2.10.2",
        "1:7.2p2-4ubuntu2.fips.2.10.3",
        "1:7.2p2-4ubuntu2.fips.2.10.4",
        "1:7.2p2-4ubuntu2.fips.2.10.5",
        "1:7.2p2-4ubuntu2.fips.2.10.6",
        "1:7.2p2-4ubuntu2.fips.2.10.7"
      ]
    },
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Ubuntu:Pro:FIPS:16.04:LTS",
        "name": "openssh",
        "purl": "pkg:deb/ubuntu/openssh@1:7.2p2-4ubuntu2.fips.2.10.1?arch=source\u0026distro=fips/xenial"
      },
      "ranges": [
        {
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        "1:7.6p1-4ubuntu0.3",
        "1:7.6p1-4ubuntu0.5",
        "1:7.6p1-4ubuntu0.6",
        "1:7.6p1-4ubuntu0.7",
        "1:7.6p1-4ubuntu0.7+esm1",
        "1:7.6p1-4ubuntu0.7+esm2",
        "1:7.6p1-4ubuntu0.7+esm3",
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    },
    {
      "ecosystem_specific": {},
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        "name": "openssh-ssh1",
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      },
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        }
      ],
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        "1:7.5p1-9",
        "1:7.5p1-9build1",
        "1:7.5p1-10"
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    },
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Ubuntu:Pro:FIPS-updates:18.04:LTS",
        "name": "openssh",
        "purl": "pkg:deb/ubuntu/openssh@1:7.9p1-10~ubuntu18.04.fips.0.10?arch=source\u0026distro=fips-updates/bionic"
      },
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        "1:7.9p1-10~ubuntu18.04.fips.0.2",
        "1:7.9p1-10~ubuntu18.04.fips.0.3",
        "1:7.9p1-10~ubuntu18.04.fips.0.4",
        "1:7.9p1-10~ubuntu18.04.fips.0.5",
        "1:7.9p1-10~ubuntu18.04.fips.0.6",
        "1:7.9p1-10~ubuntu18.04.fips.0.7",
        "1:7.9p1-10~ubuntu18.04.fips.0.8",
        "1:7.9p1-10~ubuntu18.04.fips.0.9",
        "1:7.9p1-10~ubuntu18.04.fips.0.10"
      ]
    },
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Ubuntu:Pro:FIPS:18.04:LTS",
        "name": "openssh",
        "purl": "pkg:deb/ubuntu/openssh@1:7.9p1-10~ubuntu18.04.fips.0.2?arch=source\u0026distro=fips/bionic"
      },
      "ranges": [
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        "1:7.9p1-10~ubuntu18.04.fips.0.1",
        "1:7.9p1-10~ubuntu18.04.fips.0.2"
      ]
    },
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "openssh",
        "purl": "pkg:deb/ubuntu/openssh@1:8.2p1-4ubuntu0.13?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
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        "1:8.1p1-1",
        "1:8.1p1-5",
        "1:8.2p1-4",
        "1:8.2p1-4ubuntu0.1",
        "1:8.2p1-4ubuntu0.2",
        "1:8.2p1-4ubuntu0.3",
        "1:8.2p1-4ubuntu0.4",
        "1:8.2p1-4ubuntu0.5",
        "1:8.2p1-4ubuntu0.7",
        "1:8.2p1-4ubuntu0.8",
        "1:8.2p1-4ubuntu0.9",
        "1:8.2p1-4ubuntu0.10",
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        "1:8.2p1-4ubuntu0.12",
        "1:8.2p1-4ubuntu0.13"
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    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "openssh-ssh1",
        "purl": "pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-11build1?arch=source\u0026distro=esm-apps/focal"
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    },
    {
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        "ecosystem": "Ubuntu:Pro:FIPS-updates:20.04:LTS",
        "name": "openssh",
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    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "openssh",
        "purl": "pkg:deb/ubuntu/openssh@1:8.9p1-3ubuntu0.13?arch=source\u0026distro=jammy"
      },
      "ranges": [
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          ],
          "type": "ECOSYSTEM"
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        "1:8.7p1-2",
        "1:8.7p1-2build1",
        "1:8.7p1-4",
        "1:8.8p1-1",
        "1:8.9p1-3",
        "1:8.9p1-3ubuntu0.1",
        "1:8.9p1-3ubuntu0.3",
        "1:8.9p1-3ubuntu0.4",
        "1:8.9p1-3ubuntu0.5",
        "1:8.9p1-3ubuntu0.6",
        "1:8.9p1-3ubuntu0.7",
        "1:8.9p1-3ubuntu0.10",
        "1:8.9p1-3ubuntu0.11",
        "1:8.9p1-3ubuntu0.13"
      ]
    },
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "openssh-ssh1",
        "purl": "pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-13?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:7.5p1-12",
        "1:7.5p1-12build1",
        "1:7.5p1-13"
      ]
    }
  ],
  "aliases": [],
  "details": "The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client). NOTE: some reports state that 8.5 and 8.6 are also affected.",
  "id": "UBUNTU-CVE-2020-14145",
  "modified": "2025-08-01T04:52:19Z",
  "published": "2020-06-29T18:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-14145"
    },
    {
      "type": "REPORT",
      "url": "https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angriffe-auf-ssh-clients/"
    },
    {
      "type": "REPORT",
      "url": "https://www.fzi.de/fileadmin/user_upload/2020-06-26-FSA-2020-2.pdf"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/openssh/openssh-portable/compare/V_8_3_P1...V_8_4_P1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-6279-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-14145"
    }
  ],
  "related": [
    "USN-6279-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-14145"
  ],
  "withdrawn": "2025-08-01T19:37:08Z"
}



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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.