ubuntu-cve-2020-14002
Vulnerability from osv_ubuntu
Published
2020-06-29 18:15
Modified
2025-10-24 04:48
Summary
Details

PuTTY 0.68 through 0.73 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).

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)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "pterm",
            "binary_version": "0.67-3+deb9u1build0.16.04.1"
          },
          {
            "binary_name": "putty",
            "binary_version": "0.67-3+deb9u1build0.16.04.1"
          },
          {
            "binary_name": "putty-tools",
            "binary_version": "0.67-3+deb9u1build0.16.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "putty",
        "purl": "pkg:deb/ubuntu/putty@0.67-3+deb9u1build0.16.04.1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.65-2",
        "0.66-1",
        "0.66-2",
        "0.66-3",
        "0.66-4",
        "0.67-1",
        "0.67-2",
        "0.67-3build0.16.04.1",
        "0.67-3+deb9u1build0.16.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "pterm",
            "binary_version": "0.70-4"
          },
          {
            "binary_name": "putty",
            "binary_version": "0.70-4"
          },
          {
            "binary_name": "putty-tools",
            "binary_version": "0.70-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "putty",
        "purl": "pkg:deb/ubuntu/putty@0.70-4?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.70-1",
        "0.70-2",
        "0.70-3",
        "0.70-4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "pterm",
            "binary_version": "0.73-2"
          },
          {
            "binary_name": "putty",
            "binary_version": "0.73-2"
          },
          {
            "binary_name": "putty-tools",
            "binary_version": "0.73-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "putty",
        "purl": "pkg:deb/ubuntu/putty@0.73-2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.72-1",
        "0.73-1",
        "0.73-2"
      ]
    }
  ],
  "aliases": [],
  "details": "PuTTY 0.68 through 0.73 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).",
  "id": "UBUNTU-CVE-2020-14002",
  "modified": "2025-10-24T04:48:31Z",
  "published": "2020-06-29T18:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-14002"
    },
    {
      "type": "REPORT",
      "url": "https://lists.tartarus.org/pipermail/putty-announce/"
    },
    {
      "type": "REPORT",
      "url": "https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html"
    },
    {
      "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.cve.org/CVERecord?id=CVE-2020-14002"
    }
  ],
  "related": [],
  "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": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-14002"
  ]
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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