fkie_cve-2021-3996
Vulnerability from fkie_nvd
Published
2022-08-23 20:15
Modified
2024-11-21 06:23
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
secalert@redhat.comhttp://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.htmlThird Party Advisory
secalert@redhat.comhttp://seclists.org/fulldisclosure/2022/Dec/4Mailing List, Third Party Advisory
secalert@redhat.comhttp://www.openwall.com/lists/oss-security/2022/11/30/2Mailing List, Third Party Advisory
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2021-3996Issue Tracking, Third Party Advisory
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2024628Issue Tracking, Patch, Third Party Advisory
secalert@redhat.comhttps://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdbPatch, Third Party Advisory
secalert@redhat.comhttps://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotesRelease Notes, Vendor Advisory
secalert@redhat.comhttps://security.gentoo.org/glsa/202401-08
secalert@redhat.comhttps://security.netapp.com/advisory/ntap-20221209-0002/Broken Link, Third Party Advisory
secalert@redhat.comhttps://www.openwall.com/lists/oss-security/2022/01/24/2Exploit, Mailing List, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.htmlThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2022/Dec/4Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2022/11/30/2Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/security/cve/CVE-2021-3996Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=2024628Issue Tracking, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdbPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotesRelease Notes, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202401-08
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20221209-0002/Broken Link, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.openwall.com/lists/oss-security/2022/01/24/2Exploit, Mailing List, Patch, Third Party Advisory
Impacted products
Vendor Product Version
kernel util-linux *
fedoraproject fedora 35


To clipboard 

{
   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",
            },
         ],
      },
   ],
   cveTags: [],
   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: "2024-11-21T06:23:20.377",
   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",
         },
         {
            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: "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            type: "Secondary",
         },
      ],
   },
   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",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Third Party Advisory",
         ],
         url: "http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Mailing List",
            "Third Party Advisory",
         ],
         url: "http://seclists.org/fulldisclosure/2022/Dec/4",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Mailing List",
            "Third Party Advisory",
         ],
         url: "http://www.openwall.com/lists/oss-security/2022/11/30/2",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Issue Tracking",
            "Third Party Advisory",
         ],
         url: "https://access.redhat.com/security/cve/CVE-2021-3996",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Issue Tracking",
            "Patch",
            "Third Party Advisory",
         ],
         url: "https://bugzilla.redhat.com/show_bug.cgi?id=2024628",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Patch",
            "Third Party Advisory",
         ],
         url: "https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Release Notes",
            "Vendor Advisory",
         ],
         url: "https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://security.gentoo.org/glsa/202401-08",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Broken Link",
            "Third Party Advisory",
         ],
         url: "https://security.netapp.com/advisory/ntap-20221209-0002/",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         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",
      },
   ],
}


Log in or create an account to share your comment.

Security Advisory comment format.

This schema specifies the format of a comment related to a security advisory.

UUIDv4 of the comment
UUIDv4 of the Vulnerability-Lookup instance
When the comment was created originally
When the comment was last updated
Title of the comment
Description of the comment
The identifier of the vulnerability (CVE ID, GHSA-ID, PYSEC ID, etc.).



Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.