csaf_microsoft - msrc_cve-2021-25741

MSRC_CVE-2021-25741

Vulnerability from csaf_microsoft - Published: 2021-09-02 00:00 - Updated: 2025-10-01 23:11

Summary

Symlink Exchange Can Allow Host Filesystem Access

Notes

Additional Resources

To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer

The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

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          "date": "2025-10-01T23:11:09.000Z",
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "temporalScore": 8.8,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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      "title": "Symlink Exchange Can Allow Host Filesystem Access"
    }
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}

CVE-2021-25741 (GCVE-0-2021-25741)

Vulnerability from cvelistv5 – Published: 2021-09-20 17:05 – Updated: 2024-09-16 23:26

Summary

A security issue was discovered in Kubernetes where a user may be able to create a container with subpath volume mounts to access files & directories outside of the volume, including on the host filesystem.

Severity ?

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-20 - Improper Input Validation

Assigner

kubernetes

References

URL

Tags

	https://groups.google.com/g/kubernetes-security-a…	x_refsource_MISC
	https://github.com/kubernetes/kubernetes/issues/104980	x_refsource_MISC
	https://security.netapp.com/advisory/ntap-2021100…	x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	Kubernetes	Kubernetes	Affected: unspecified , ≤ 1.19.14 (custom) Affected: unspecified , ≤ 1.20.10 (custom) Affected: unspecified , ≤ 1.21.4 (custom) Affected: unspecified , ≤ 1.22.1 (custom)

Credits

Fabricio Voznika & Mark Wolters

Show details on NVD website

JSON

To clipboard

{
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          "dateUpdated": "2024-08-03T20:11:27.655Z",
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            "url": "https://security.netapp.com/advisory/ntap-20211008-0006/"
          }
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        "title": "CVE Program Container"
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        ],
        "metrics": [
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                "id": "CVE-2021-25741",
                "options": [
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                    "Exploitation": "none"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "vendor": "Kubernetes",
          "versions": [
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              "status": "affected",
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      "providerMetadata": {
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        "orgId": "a6081bf6-c852-4425-ad4f-a67919267565",
        "shortName": "kubernetes"
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      "references": [
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            "x_refsource_MISC"
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        },
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          "url": "https://github.com/kubernetes/kubernetes/issues/104980"
        },
        {
          "tags": [
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          ],
          "url": "https://security.netapp.com/advisory/ntap-20211008-0006/"
        }
      ],
      "source": {
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          "https://github.com/kubernetes/kubernetes/issues/104980"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "Symlink Exchange Can Allow Host Filesystem Access",
      "x_ConverterErrors": {
        "DATE_PUBLIC": {
          "error": "v4 DATE_PUBLIC is invalid",
          "message": "hour must be in 0..23"
        }
      },
      "x_generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "x_legacyV4Record": {
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          "ASSIGNER": "security@kubernetes.io",
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          "STATE": "PUBLIC",
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        },
        "affects": {
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            "integrityImpact": "HIGH",
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    "dateReserved": "2021-01-21T00:00:00",
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Sightings

Author	Source	Type	Date

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.

Action not permitted

MSRC_CVE-2021-25741

CVE-2021-25741 (GCVE-0-2021-25741)

Tags

Sightings

Nomenclature