gsd-2021-3996
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows a local user on a vulnerable system to unmount other users' filesystems that are either world-writable themselves (like /tmp) or mounted in a world-writable directory. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.
Aliases
Aliases
CVE-2021-3996


To clipboard 

{
  "GSD": {
    "alias": "CVE-2021-3996",
    "description": "A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows a local user on a vulnerable system to unmount other users\u0027 filesystems that are either world-writable themselves (like /tmp) or mounted in a world-writable directory. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.",
    "id": "GSD-2021-3996",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-3996.html",
      "https://www.debian.org/security/2022/dsa-5055",
      "https://ubuntu.com/security/CVE-2021-3996",
      "https://advisories.mageia.org/CVE-2021-3996.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-3996"
      ],
      "details": "A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows a local user on a vulnerable system to unmount other users\u0027 filesystems that are either world-writable themselves (like /tmp) or mounted in a world-writable directory. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.",
      "id": "GSD-2021-3996",
      "modified": "2023-12-13T01:23:34.126855Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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      "CVE_data_meta": {
        "ASSIGNER": "secalert@redhat.com",
        "ID": "CVE-2021-3996",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "util-linux",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "Fixed in util-linux v2.37.3"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "n/a"
            }
          ]
        }
      },
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      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
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            "lang": "eng",
            "value": "A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows a local user on a vulnerable system to unmount other users\u0027 filesystems that are either world-writable themselves (like /tmp) or mounted in a world-writable directory. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems."
          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-552 - Files or Directories Accessible to External Parties"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes",
            "refsource": "MISC",
            "url": "https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes"
          },
          {
            "name": "https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb",
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            "url": "https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb"
          },
          {
            "name": "https://www.openwall.com/lists/oss-security/2022/01/24/2",
            "refsource": "MISC",
            "url": "https://www.openwall.com/lists/oss-security/2022/01/24/2"
          },
          {
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          },
          {
            "name": "https://access.redhat.com/security/cve/CVE-2021-3996",
            "refsource": "MISC",
            "url": "https://access.redhat.com/security/cve/CVE-2021-3996"
          },
          {
            "name": "[oss-security] 20221130 Race condition in snap-confine\u0027s must_mkdir_and_open_with_perms() (CVE-2022-3328)",
            "refsource": "MLIST",
            "url": "http://www.openwall.com/lists/oss-security/2022/11/30/2"
          },
          {
            "name": "20221208 Race condition in snap-confine\u0027s must_mkdir_and_open_with_perms() (CVE-2022-3328)",
            "refsource": "FULLDISC",
            "url": "http://seclists.org/fulldisclosure/2022/Dec/4"
          },
          {
            "name": "http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html",
            "refsource": "MISC",
            "url": "http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html"
          },
          {
            "name": "https://security.netapp.com/advisory/ntap-20221209-0002/",
            "refsource": "CONFIRM",
            "url": "https://security.netapp.com/advisory/ntap-20221209-0002/"
          },
          {
            "name": "GLSA-202401-08",
            "refsource": "GENTOO",
            "url": "https://security.gentoo.org/glsa/202401-08"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "configurations": [
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                    "versionEndExcluding": "2.37.3",
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        "descriptions": [
          {
            "lang": "en",
            "value": "A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows a local user on a vulnerable system to unmount other users\u0027 filesystems that are either world-writable themselves (like /tmp) or mounted in a world-writable directory. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems."
          },
          {
            "lang": "es",
            "value": "Se ha encontrado un error l\u00f3gico en la biblioteca libmount de util-linux en la funci\u00f3n que permite a un usuario no privilegiado desmontar un sistema de archivos FUSE. Este fallo permite a un usuario local en un sistema vulnerable desmontar los sistemas de archivos de otros usuarios que son de escritura mundial (como /tmp) o que est\u00e1n montados en un directorio de escritura mundial. Un atacante puede usar este fallo para causar una denegaci\u00f3n de servicio a las aplicaciones que usan los sistemas de archivos afectados."
          }
        ],
        "id": "CVE-2021-3996",
        "lastModified": "2024-01-07T09:15:08.600",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
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        },
        "published": "2022-08-23T20:15:08.560",
        "references": [
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            "source": "secalert@redhat.com",
            "tags": [
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            "url": "https://security.gentoo.org/glsa/202401-08"
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        "vulnStatus": "Modified",
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    }
  }
}


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