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CVE-2021-44730 (GCVE-0-2021-44730)

Vulnerability from cvelistv5 – Published: 2022-02-17 22:15 – Updated: 2024-08-04 04:32
VLAI
Title
snapd could be made to escalate privileges and run programs as administrator
Summary
snapd 2.54.2 did not properly validate the location of the snap-confine binary. A local attacker who can hardlink this binary to another location to cause snap-confine to execute other arbitrary binaries 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-59 - Improper Link Resolution Before File Access ('Link Following')
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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            "value": "snapd 2.54.2 did not properly validate the location of the snap-confine binary. A local attacker who can hardlink this binary to another location to cause snap-confine to execute other arbitrary binaries 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"
          },
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            "value": "snapd versi\u00f3n 2.54.2, no comprueba apropiadamente la ubicaci\u00f3n del binario snap-confine. Un atacante local que pueda enlazar este binario a otra ubicaci\u00f3n puede causar que snap-confine ejecute otros binarios arbitrarios y, por lo tanto, alcanzar 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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        "sourceIdentifier": "security@ubuntu.com",
        "vulnStatus": "Modified",
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    "redhat_vex": {
      "current_release_date": "2025-11-21T16:01:00+00:00",
      "cve": "CVE-2021-44730",
      "id": "CVE-2021-44730",
      "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: Hardlink attack in snap-confine\u0027s sc_open_snapd_tool()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-44730.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.