fkie_cve-2019-15793
Vulnerability from fkie_nvd
Published
2020-04-24 00:15
Modified
2024-11-21 04:29
Severity ?
6.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
8.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
In shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, several locations which shift ids translate user/group ids before performing operations in the lower filesystem were translating them into init_user_ns, whereas they should have been translated into the s_user_ns for the lower filesystem. This resulted in using ids other than the intended ones in the lower fs, which likely did not map into the shifts s_user_ns. A local attacker could use this to possibly bypass discretionary access control permissions.
References
security@ubuntu.comhttps://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=3644b9d5688da86f18e017c9c580b75cf52927bbMailing List, Patch, Third Party Advisory
security@ubuntu.comhttps://usn.ubuntu.com/usn/usn-4183-1Third Party Advisory
security@ubuntu.comhttps://usn.ubuntu.com/usn/usn-4184-1Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=3644b9d5688da86f18e017c9c580b75cf52927bbMailing List, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://usn.ubuntu.com/usn/usn-4183-1Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://usn.ubuntu.com/usn/usn-4184-1Third Party Advisory
Impacted products
Vendor Product Version
linux linux_kernel 5.0
linux linux_kernel 5.3
canonical ubuntu_linux 18.04
canonical ubuntu_linux 19.04


To clipboard 

{
  "configurations": [
    {
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        {
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              "vulnerable": true
            },
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, several locations which shift ids translate user/group ids before performing operations in the lower filesystem were translating them into init_user_ns, whereas they should have been translated into the s_user_ns for the lower filesystem. This resulted in using ids other than the intended ones in the lower fs, which likely did not map into the shifts s_user_ns. A local attacker could use this to possibly bypass discretionary access control permissions."
    },
    {
      "lang": "es",
      "value": "En shiftfs, un parche no upstream para el Kernel de Linux  incluido en las series kernel de Ubuntu versiones 5.0 y 5.3, varias ubicaciones que desplazan los ids traducen los ids de usuario/grupo antes de realizar operaciones en el sistema de archivos inferior los estaban traduciendo a init_user_ns, mientras que deber\u00edan haber sido traducidos a s_user_ns para el sistema de archivos inferior. Esto dio lugar a que se utilizaran ids distintos de los previstos en los fs inferiores, que probablemente no se mapearon en los shifts s_user_ns. Un atacante local podr\u00eda usar esto para posiblemente eludir los permisos de control de acceso discrecional."
    }
  ],
  "id": "CVE-2019-15793",
  "lastModified": "2024-11-21T04:29:28.743",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 4.6,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P",
          "version": "2.0"
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        "exploitabilityScore": 3.9,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
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        "type": "Primary",
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
          "version": "3.1"
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        "type": "Secondary"
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
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          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
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        "source": "nvd@nist.gov",
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  "published": "2020-04-24T00:15:11.840",
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  "sourceIdentifier": "security@ubuntu.com",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-538"
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      "type": "Secondary"
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          "lang": "en",
          "value": "CWE-276"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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