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FKIE_CVE-2021-44731

Vulnerability from fkie_nvd - Published: 2022-02-17 23:15 - Updated: 2026-06-17 04:12
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
A race condition existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap. This could allow a local attacker to gain root privileges by bind-mounting their own contents inside the snap's private mount namespace and causing snap-confine to execute arbitrary code and hence gain privilege escalation. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1
References
security@ubuntu.comhttp://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.htmlExploit, Third Party Advisory, VDB Entry
security@ubuntu.comhttp://seclists.org/fulldisclosure/2022/Dec/4Exploit, Mailing List, Third Party Advisory
security@ubuntu.comhttp://www.openwall.com/lists/oss-security/2022/02/18/2Mailing List, Third Party Advisory
security@ubuntu.comhttp://www.openwall.com/lists/oss-security/2022/02/23/1Exploit, Mailing List, Third Party Advisory
security@ubuntu.comhttp://www.openwall.com/lists/oss-security/2022/02/23/2Mailing List, Third Party Advisory
security@ubuntu.comhttp://www.openwall.com/lists/oss-security/2022/11/30/2Exploit, Mailing List, Third Party Advisory
security@ubuntu.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3QTBN7LLZISXIA4KU4UKDR27Q5PXDS2U/
security@ubuntu.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCGHG6LJAVJJ72TMART6A7N4Z6MSTGI7/
security@ubuntu.comhttps://ubuntu.com/security/notices/USN-5292-1Patch, Vendor Advisory
security@ubuntu.comhttps://www.debian.org/security/2022/dsa-5080Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.htmlExploit, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2022/Dec/4Exploit, Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2022/02/18/2Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2022/02/23/1Exploit, Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2022/02/23/2Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2022/11/30/2Exploit, Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3QTBN7LLZISXIA4KU4UKDR27Q5PXDS2U/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCGHG6LJAVJJ72TMART6A7N4Z6MSTGI7/
af854a3a-2127-422b-91ae-364da2661108https://ubuntu.com/security/notices/USN-5292-1Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2022/dsa-5080Issue Tracking, Third Party Advisory
Impacted products
Vendor Product Version
canonical snapd *
canonical ubuntu_linux 18.04
canonical ubuntu_linux 20.04
canonical ubuntu_linux 21.10
fedoraproject fedora 34
fedoraproject fedora 35
debian debian_linux 10.0
debian debian_linux 11.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "snapd",
          "vendor": "Canonical Ltd.",
          "versions": [
            {
              "lessThanOrEqual": "2.54.2",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "security@ubuntu.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "matchCriteriaId": "90115CE1-12C4-4504-A1A2-9C118694C398",
              "versionEndIncluding": "2.54.2",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
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              "vulnerable": true
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              "matchCriteriaId": "902B8056-9E37-443B-8905-8AA93E2447FB",
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              "matchCriteriaId": "AAE4D2D0-CEEB-416F-8BC5-A7987DF56190",
              "vulnerable": true
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    {
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              "vulnerable": true
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          ],
          "negate": false,
          "operator": "OR"
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      ]
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A race condition existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap. This could allow a local attacker to gain root privileges by bind-mounting their own contents inside the snap\u0027s private mount namespace and causing snap-confine to execute arbitrary code and hence gain privilege escalation. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1"
    },
    {
      "lang": "es",
      "value": "Se presentaba una condici\u00f3n de carrera en snapd versi\u00f3n 2.54.2 en el binario snap-confine cuando era preparado un espacio de nombres de montaje privado para un snap. Esto pod\u00eda permitir a un atacante local alcanzar privilegios de root al montar su propio contenido dentro del espacio de nombres de montaje privado del snap y causar que snap-confine ejecutara c\u00f3digo arbitrario y por lo tanto obtuviera una escalada de privilegios. Corregido en snapd versiones 2.54.3+18.04, 2.54.3+20.04 y 2.54.3+21.10.1"
    }
  ],
  "id": "CVE-2021-44731",
  "lastModified": "2026-06-17T04:12:46.470",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 6.9,
          "confidentialityImpact": "COMPLETE",
          "integrityImpact": "COMPLETE",
          "vectorString": "AV:L/AC:M/Au:N/C:C/I:C/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 3.4,
        "impactScore": 10.0,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.1,
        "impactScore": 6.0,
        "source": "security@ubuntu.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.1,
        "impactScore": 6.0,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2022-02-17T23:15:07.473",
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      "tags": [
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}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.