gsd-2021-3995
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 an unprivileged local attacker to unmount FUSE filesystems that belong to certain other users who have a UID that is a prefix of the UID of the attacker in its string form. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.
Aliases
Aliases
CVE-2021-3995


To clipboard 

{
   GSD: {
      alias: "CVE-2021-3995",
      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 an unprivileged local attacker to unmount FUSE filesystems that belong to certain other users who have a UID that is a prefix of the UID of the attacker in its string form. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.",
      id: "GSD-2021-3995",
      references: [
         "https://www.suse.com/security/cve/CVE-2021-3995.html",
         "https://www.debian.org/security/2022/dsa-5055",
         "https://ubuntu.com/security/CVE-2021-3995",
         "https://advisories.mageia.org/CVE-2021-3995.html",
      ],
   },
   gsd: {
      metadata: {
         exploitCode: "unknown",
         remediation: "unknown",
         reportConfidence: "confirmed",
         type: "vulnerability",
      },
      osvSchema: {
         aliases: [
            "CVE-2021-3995",
         ],
         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 an unprivileged local attacker to unmount FUSE filesystems that belong to certain other users who have a UID that is a prefix of the UID of the attacker in its string form. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.",
         id: "GSD-2021-3995",
         modified: "2023-12-13T01:23:35.153805Z",
         schema_version: "1.4.0",
      },
   },
   namespaces: {
      "cve.org": {
         CVE_data_meta: {
            ASSIGNER: "secalert@redhat.com",
            ID: "CVE-2021-3995",
            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",
                  },
               ],
            },
         },
         data_format: "MITRE",
         data_type: "CVE",
         data_version: "4.0",
         description: {
            description_data: [
               {
                  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 an unprivileged local attacker to unmount FUSE filesystems that belong to certain other users who have a UID that is a prefix of the UID of the attacker in its string form. 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://www.openwall.com/lists/oss-security/2022/01/24/2",
                  refsource: "MISC",
                  url: "https://www.openwall.com/lists/oss-security/2022/01/24/2",
               },
               {
                  name: "https://github.com/util-linux/util-linux/commit/57202f5713afa2af20ffbb6ab5331481d0396f8d",
                  refsource: "MISC",
                  url: "https://github.com/util-linux/util-linux/commit/57202f5713afa2af20ffbb6ab5331481d0396f8d",
               },
               {
                  name: "https://bugzilla.redhat.com/show_bug.cgi?id=2024631https://access.redhat.com/security/cve/CVE-2021-3995",
                  refsource: "MISC",
                  url: "https://bugzilla.redhat.com/show_bug.cgi?id=2024631https://access.redhat.com/security/cve/CVE-2021-3995",
               },
               {
                  name: "[oss-security] 20221130 Race condition in snap-confine's 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's 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: [
               {
                  nodes: [
                     {
                        cpeMatch: [
                           {
                              criteria: "cpe:2.3:a:kernel:util-linux:*:*:*:*:*:*:*:*",
                              matchCriteriaId: "755D0AAC-24D9-4B39-BCC2-06AC9FF889E2",
                              versionEndExcluding: "2.37.3",
                              versionStartIncluding: "2.34",
                              vulnerable: true,
                           },
                        ],
                        negate: false,
                        operator: "OR",
                     },
                  ],
               },
               {
                  nodes: [
                     {
                        cpeMatch: [
                           {
                              criteria: "cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*",
                              matchCriteriaId: "80E516C0-98A4-4ADE-B69F-66A772E2BAAA",
                              vulnerable: true,
                           },
                        ],
                        negate: false,
                        operator: "OR",
                     },
                  ],
               },
            ],
            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 an unprivileged local attacker to unmount FUSE filesystems that belong to certain other users who have a UID that is a prefix of the UID of the attacker in its string form. 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 lógico en la biblioteca libmount de util-linux en la función que permite a un usuario no privilegiado desmontar un sistema de archivos FUSE. Este fallo permite a un atacante local no privilegiado desmontar sistemas de archivos FUSE que pertenecen a otros usuarios determinados que presentan un UID que es un prefijo del UID del atacante en su forma de cadena. Un atacante puede usar este fallo para causar una denegación de servicio a las aplicaciones que usan los sistemas de archivos afectados.",
               },
            ],
            id: "CVE-2021-3995",
            lastModified: "2024-01-07T09:15:08.413",
            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",
                  },
               ],
            },
            published: "2022-08-23T20:15:08.493",
            references: [
               {
                  source: "secalert@redhat.com",
                  tags: [
                     "Third Party Advisory",
                     "VDB Entry",
                  ],
                  url: "http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html",
               },
               {
                  source: "secalert@redhat.com",
                  tags: [
                     "Mailing List",
                     "Third Party Advisory",
                  ],
                  url: "http://seclists.org/fulldisclosure/2022/Dec/4",
               },
               {
                  source: "secalert@redhat.com",
                  tags: [
                     "Mailing List",
                     "Third Party Advisory",
                  ],
                  url: "http://www.openwall.com/lists/oss-security/2022/11/30/2",
               },
               {
                  source: "secalert@redhat.com",
                  tags: [
                     "Broken Link",
                     "Issue Tracking",
                  ],
                  url: "https://bugzilla.redhat.com/show_bug.cgi?id=2024631https://access.redhat.com/security/cve/CVE-2021-3995",
               },
               {
                  source: "secalert@redhat.com",
                  tags: [
                     "Patch",
                     "Third Party Advisory",
                  ],
                  url: "https://github.com/util-linux/util-linux/commit/57202f5713afa2af20ffbb6ab5331481d0396f8d",
               },
               {
                  source: "secalert@redhat.com",
                  tags: [
                     "Release Notes",
                     "Vendor Advisory",
                  ],
                  url: "https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes",
               },
               {
                  source: "secalert@redhat.com",
                  url: "https://security.gentoo.org/glsa/202401-08",
               },
               {
                  source: "secalert@redhat.com",
                  tags: [
                     "Third Party Advisory",
                  ],
                  url: "https://security.netapp.com/advisory/ntap-20221209-0002/",
               },
               {
                  source: "secalert@redhat.com",
                  tags: [
                     "Exploit",
                     "Mailing List",
                     "Patch",
                     "Third Party Advisory",
                  ],
                  url: "https://www.openwall.com/lists/oss-security/2022/01/24/2",
               },
            ],
            sourceIdentifier: "secalert@redhat.com",
            vulnStatus: "Modified",
            weaknesses: [
               {
                  description: [
                     {
                        lang: "en",
                        value: "CWE-552",
                     },
                  ],
                  source: "secalert@redhat.com",
                  type: "Primary",
               },
               {
                  description: [
                     {
                        lang: "en",
                        value: "CWE-552",
                     },
                  ],
                  source: "nvd@nist.gov",
                  type: "Secondary",
               },
            ],
         },
      },
   },
}


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