CVE-2021-3996 (GCVE-0-2021-3996)

Vulnerability from cvelistv5 – Published: 2022-08-23 00:00 – Updated: 2024-10-15 15:26
VLAI
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-552 - - Files or Directories Accessible to External Parties
Assigner
References
Impacted products
Vendor Product Version
n/a util-linux Affected: Fixed in util-linux v2.37.3
Show details on NVD website
To clipboard 

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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://www.openwall.com/lists/oss-security/2022/01/24/2\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2024628\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2021-3996\", \"tags\": [\"x_transferred\"]}, {\"url\": \"http://www.openwall.com/lists/oss-security/2022/11/30/2\", \"name\": \"[oss-security] 20221130 Race condition in snap-confine\u0027s must_mkdir_and_open_with_perms() (CVE-2022-3328)\", \"tags\": [\"mailing-list\", \"x_transferred\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2022/Dec/4\", \"name\": \"20221208 Race condition in snap-confine\u0027s must_mkdir_and_open_with_perms() (CVE-2022-3328)\", \"tags\": [\"mailing-list\", \"x_transferred\"]}, {\"url\": \"http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20221209-0002/\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://security.gentoo.org/glsa/202401-08\", \"name\": \"GLSA-202401-08\", \"tags\": [\"vendor-advisory\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-03T17:16:02.913Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-3996\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-03-04T21:16:28.797475Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-15T15:26:41.487Z\"}}], \"cna\": {\"affected\": [{\"vendor\": \"n/a\", \"product\": \"util-linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"Fixed in util-linux v2.37.3\"}]}], \"references\": [{\"url\": \"https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes\"}, {\"url\": \"https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb\"}, {\"url\": \"https://www.openwall.com/lists/oss-security/2022/01/24/2\"}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2024628\"}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2021-3996\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2022/11/30/2\", \"name\": \"[oss-security] 20221130 Race condition in snap-confine\u0027s must_mkdir_and_open_with_perms() (CVE-2022-3328)\", \"tags\": [\"mailing-list\"]}, {\"url\": \"http://seclists.org/fulldisclosure/2022/Dec/4\", \"name\": \"20221208 Race condition in snap-confine\u0027s must_mkdir_and_open_with_perms() (CVE-2022-3328)\", \"tags\": [\"mailing-list\"]}, {\"url\": \"http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20221209-0002/\"}, {\"url\": \"https://security.gentoo.org/glsa/202401-08\", \"name\": \"GLSA-202401-08\", \"tags\": [\"vendor-advisory\"]}], \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-552\", \"description\": \"CWE-552 - Files or Directories Accessible to External Parties\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2024-01-07T09:06:22.825Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-3996\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-10-15T15:26:56.079Z\", \"dateReserved\": \"2021-11-22T00:00:00.000Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2022-08-23T00:00:00.000Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.