ubuntu-cve-2020-5211
Vulnerability from osv_ubuntu
Published
2020-01-28 19:15
Modified
2025-10-24 04:48
Summary
Details

In NetHack before 3.6.5, an invalid extended command in value for the AUTOCOMPLETE configuration file option can cause a buffer overflow resulting in a crash or remote code execution/privilege escalation. This vulnerability affects systems that have NetHack installed suid/sgid and shared systems that allow users to upload their own configuration files. Users should upgrade to NetHack 3.6.5.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nethack-common",
            "binary_version": "3.4.3-15build1"
          },
          {
            "binary_name": "nethack-console",
            "binary_version": "3.4.3-15build1"
          },
          {
            "binary_name": "nethack-lisp",
            "binary_version": "3.4.3-15build1"
          },
          {
            "binary_name": "nethack-x11",
            "binary_version": "3.4.3-15build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "nethack",
        "purl": "pkg:deb/ubuntu/nethack@3.4.3-15build1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.4.3-15",
        "3.4.3-15build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nethack-common",
            "binary_version": "3.6.0-4"
          },
          {
            "binary_name": "nethack-console",
            "binary_version": "3.6.0-4"
          },
          {
            "binary_name": "nethack-lisp",
            "binary_version": "3.6.0-4"
          },
          {
            "binary_name": "nethack-x11",
            "binary_version": "3.6.0-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "nethack",
        "purl": "pkg:deb/ubuntu/nethack@3.6.0-4?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.6.0-4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nethack-common",
            "binary_version": "3.6.1-1"
          },
          {
            "binary_name": "nethack-console",
            "binary_version": "3.6.1-1"
          },
          {
            "binary_name": "nethack-lisp",
            "binary_version": "3.6.1-1"
          },
          {
            "binary_name": "nethack-x11",
            "binary_version": "3.6.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "nethack",
        "purl": "pkg:deb/ubuntu/nethack@3.6.1-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.6.1-1"
      ]
    }
  ],
  "aliases": [],
  "details": "In NetHack before 3.6.5, an invalid extended command in value for the AUTOCOMPLETE configuration file option can cause a buffer overflow resulting in a crash or remote code execution/privilege escalation. This vulnerability affects systems that have NetHack installed suid/sgid and shared systems that allow users to upload their own configuration files. Users should upgrade to NetHack 3.6.5.",
  "id": "UBUNTU-CVE-2020-5211",
  "modified": "2025-10-24T04:48:17Z",
  "published": "2020-01-28T19:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-5211"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/NetHack/NetHack/security/advisories/GHSA-r788-4jf4-r9f7"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-5211"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-5211"
  ]
}



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Sightings

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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.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.