FKIE_CVE-2018-17071

Vulnerability from fkie_nvd - Published: 2018-09-18 21:29 - Updated: 2026-06-17 01:45
Severity
7.5 (High) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Summary
The fallback function of a simple lottery smart contract implementation for Lucky9io, an Ethereum gambling game, generates a random value with the publicly readable variable entry_number. This variable is private, yet it is readable by eth.getStorageAt function. Also, attackers can purchase a ticket at a low price by directly calling the fallback function with small msg.value, because the developer set the currency unit incorrectly. Therefore, it allows attackers to always win and get rewards.
References
cve@mitre.orghttps://github.com/TEAM-C4B/CVE-LIST/tree/master/CVE-2018-17071Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/TEAM-C4B/CVE-LIST/tree/master/CVE-2018-17071Exploit, Third Party Advisory
Impacted products
Vendor Product Version
lucky9 lucky9io -
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:lucky9:lucky9io:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "A90B2110-2E27-4E5F-B298-6A62FE97F3E1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The fallback function of a simple lottery smart contract implementation for Lucky9io, an Ethereum gambling game, generates a random value with the publicly readable variable entry_number. This variable is private, yet it is readable by eth.getStorageAt function. Also, attackers can purchase a ticket at a low price by directly calling the fallback function with small msg.value, because the developer set the currency unit incorrectly. Therefore, it allows attackers to always win and get rewards."
    },
    {
      "lang": "es",
      "value": "La funci\u00f3n fallback de una simple implementaci\u00f3n de contrato inteligente de loter\u00eda para Lucky9io, un juego de apuestas de Ethereum, genera un valor aleatorio con la variable legible p\u00fablicamente entry_number. Este valor es privado, aunque puede ser le\u00eddo por la funci\u00f3n eth.getStorageAt. Adem\u00e1s, los atacantes pueden comprar un ticket a bajo precio llamando directamente a la funci\u00f3n fallback con un msg.value peque\u00f1o. Esto se debe a que el desarrollador ha establecido la divisa incorrectamente.  Por lo tanto, permite que los atacantes ganen siempre y obtengan recompensas."
    }
  ],
  "id": "CVE-2018-17071",
  "lastModified": "2026-06-17T01:45:19.123",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 5.0,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.0"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2018-09-18T21:29:03.807",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/TEAM-C4B/CVE-LIST/tree/master/CVE-2018-17071"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/TEAM-C4B/CVE-LIST/tree/master/CVE-2018-17071"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-338"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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