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' 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' 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: {
      "cve.org": {
         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",
                  },
               ],
            },
         },
         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 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.",
               },
            ],
         },
         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",
                  refsource: "MISC",
                  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",
               },
               {
                  name: "https://bugzilla.redhat.com/show_bug.cgi?id=2024628",
                  refsource: "MISC",
                  url: "https://bugzilla.redhat.com/show_bug.cgi?id=2024628",
               },
               {
                  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'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: [
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                              criteria: "cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*",
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                              vulnerable: true,
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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' 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 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 usuario local en un sistema vulnerable desmontar los sistemas de archivos de otros usuarios que son de escritura mundial (como /tmp) o que están montados en un directorio de escritura mundial. Un atacante puede usar este fallo para causar una denegación de servicio a las aplicaciones que usan los sistemas de archivos afectados.",
               },
            ],
            id: "CVE-2021-3996",
            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",
                  },
               ],
            },
            published: "2022-08-23T20:15:08.560",
            references: [
               {
                  source: "secalert@redhat.com",
                  tags: [
                     "Third Party Advisory",
                  ],
                  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: [
                     "Issue Tracking",
                     "Third Party Advisory",
                  ],
                  url: "https://access.redhat.com/security/cve/CVE-2021-3996",
               },
               {
                  source: "secalert@redhat.com",
                  tags: [
                     "Issue Tracking",
                     "Patch",
                     "Third Party Advisory",
                  ],
                  url: "https://bugzilla.redhat.com/show_bug.cgi?id=2024628",
               },
               {
                  source: "secalert@redhat.com",
                  tags: [
                     "Patch",
                     "Third Party Advisory",
                  ],
                  url: "https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb",
               },
               {
                  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: [
                     "Broken Link",
                     "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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