FKIE_CVE-2020-9452

Vulnerability from fkie_nvd - Published: 2021-05-25 12:15 - Updated: 2024-11-21 05:40
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
An issue was discovered in Acronis True Image 2020 24.5.22510. anti_ransomware_service.exe includes functionality to quarantine files by copying a suspected ransomware file from one directory to another using SYSTEM privileges. Because unprivileged users have write permissions in the quarantine folder, it is possible to control this privileged write with a hardlink. This means that an unprivileged user can write/overwrite arbitrary files in arbitrary folders. Escalating privileges to SYSTEM is trivial with arbitrary writes. While the quarantine feature is not enabled by default, it can be forced to copy the file to the quarantine by communicating with anti_ransomware_service.exe through its REST API.
References
cve@mitre.orghttps://danishcyberdefence.dk/blogThird Party Advisory
cve@mitre.orghttps://madsjoensen.dk/cve-2020-9452/Exploit, Third Party Advisory
cve@mitre.orghttps://www.acronis.comVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://danishcyberdefence.dk/blogThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://madsjoensen.dk/cve-2020-9452/Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.acronis.comVendor Advisory
Impacted products
Vendor Product Version
acronis true_image_2020 24.5.22510
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:acronis:true_image_2020:24.5.22510:*:*:*:*:*:*:*",
              "matchCriteriaId": "5098DA80-2939-413C-AC35-A0D3A455CA28",
              "vulnerable": true
            }
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          "negate": false,
          "operator": "OR"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in Acronis True Image 2020 24.5.22510. anti_ransomware_service.exe includes functionality to quarantine files by copying a suspected ransomware file from one directory to another using SYSTEM privileges. Because unprivileged users have write permissions in the quarantine folder, it is possible to control this privileged write with a hardlink. This means that an unprivileged user can write/overwrite arbitrary files in arbitrary folders. Escalating privileges to SYSTEM is trivial with arbitrary writes. While the quarantine feature is not enabled by default, it can be forced to copy the file to the quarantine by communicating with anti_ransomware_service.exe through its REST API."
    },
    {
      "lang": "es",
      "value": "Se detect\u00f3 un problema en Acronis True Image 2020 versiones 24.5.22510.\u0026#xa0;El archivo anti_ransomware_service.exe incluye la funcionalidad para poner en cuarentena archivos al copiar un archivo sospechoso de ransomware de un directorio a otro usando privilegios SYSTEM.\u0026#xa0;Debido a que usuarios no privilegiados presentan permisos de escritura en la carpeta de cuarentena, es posible controlar esta escritura privilegiada con un enlace f\u00edsico.\u0026#xa0;Esto significa para un usuario no privilegiado poder escribir o sobrescribir archivos arbitrarios en carpetas arbitrarias.\u0026#xa0;Escalar privilegios a SYSTEM es trivial con escrituras arbitrarias.\u0026#xa0;Si bien la funcionalidad quarantine no est\u00e1 habilitada por defecto, puede ser forzado a copiar el archivo a la cuarentena comunic\u00e1ndose con anti_ransomware_service.exe por medio de su API REST"
    }
  ],
  "id": "CVE-2020-9452",
  "lastModified": "2024-11-21T05:40:40.197",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 7.2,
          "confidentialityImpact": "COMPLETE",
          "integrityImpact": "COMPLETE",
          "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 10.0,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  },
  "published": "2021-05-25T12:15:07.833",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://danishcyberdefence.dk/blog"
    },
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      "url": "https://www.acronis.com"
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      "tags": [
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      "url": "https://danishcyberdefence.dk/blog"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://madsjoensen.dk/cve-2020-9452/"
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://www.acronis.com"
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  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-59"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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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.

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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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