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CVE-2021-44731 (GCVE-0-2021-44731)

Vulnerability from cvelistv5 – Published: 2022-02-17 00:00 – Updated: 2024-08-04 04:32
VLAI
Title
snapd could be made to escalate privileges and run programs as administrator
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
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE
  • CWE-362 - Race Condition (Concurrent Execution using Shared Resource with Improper Synchronization)
Assigner
References
Impacted products
Vendor Product Version CPE status
Canonical Ltd. snapd Affected: unspecified , ≤ 2.54.2 (custom)
guessed Create a notification for this product.
Credits
Qualys Research Team
Show details on NVD website
To clipboard 

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            "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"
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        "id": "CVE-2021-44731",
        "lastModified": "2026-06-17T04:12:46.470",
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        "vulnStatus": "Modified",
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                "value": "CWE-362"
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    },
    "redhat_vex": {
      "current_release_date": "2025-11-21T16:01:00+00:00",
      "cve": "CVE-2021-44731",
      "id": "CVE-2021-44731",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "snapd: Race condition in snap-confine\u0027s setup_private_mount()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-44731.json",
      "version": "3"
    }
  }
}



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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.


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.