Vulnerability-Lookup

FKIE_CVE-2021-28099

Vulnerability from fkie_nvd - Published: 2021-03-23 21:15 - Updated: 2026-06-17 03:45

Severity

4.4 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Summary

In Netflix OSS Hollow, since the Files.exists(parent) is run before creating the directories, an attacker can pre-create these directories with wide permissions. Additionally, since an insecure source of randomness is used, the file names to be created can be deterministically calculated.

References

	URL	Tags
	security-report@netflix.com	https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2021-001.md	Third Party Advisory
	af854a3a-2127-422b-91ae-364da2661108	https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2021-001.md	Third Party Advisory

Impacted products

	Vendor	Product	Version
	netflix	hollow	-

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Netflix OSS Hollow",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "All versions"
            }
          ]
        }
      ],
      "source": "security-report@netflix.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:netflix:hollow:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "1E659DA4-A87C-478F-8A1E-F592AA631374",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In Netflix OSS Hollow, since the Files.exists(parent) is run before creating the directories, an attacker can pre-create these directories with wide permissions. Additionally, since an insecure source of randomness is used, the file names to be created can be deterministically calculated."
    },
    {
      "lang": "es",
      "value": "En Netflix OSS Hollow, dado que Files.exists(parent) se ejecuta antes de crear los directorios, un atacante puede crear previamente estos directorios con amplios permisos.\u0026#xa0;Adem\u00e1s, dado que se utiliza una fuente no segura de aleatoriedad, los nombres de archivo que se crear\u00e1n se pueden calcular de forma determinista"
    }
  ],
  "id": "CVE-2021-28099",
  "lastModified": "2026-06-17T03:45:48.640",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "LOW",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 3.6,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 4.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 2.5,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-03-23T21:15:13.557",
  "references": [
    {
      "source": "security-report@netflix.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2021-001.md"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2021-001.md"
    }
  ],
  "sourceIdentifier": "security-report@netflix.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-330"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2021-28099 (GCVE-0-2021-28099)

Vulnerability from cvelistv5 – Published: 2021-03-23 20:28 – Updated: 2024-08-03 21:33

Summary

Severity

No CVSS data available.

CWE

Local Information Disclosure

Assigner

netflix CNA under the mitre root

CNA scorecard – unranked: 0 records in the last 180 days, 10 needed details

References

1 reference

URL	Tags
https://github.com/Netflix/security-bulletins/blo…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
n/a	Netflix OSS Hollow	Affected: All versions

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T21:33:17.497Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2021-001.md"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Netflix OSS Hollow",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "All versions"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In Netflix OSS Hollow, since the Files.exists(parent) is run before creating the directories, an attacker can pre-create these directories with wide permissions. Additionally, since an insecure source of randomness is used, the file names to be created can be deterministically calculated."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "Local Information Disclosure",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-03-23T20:28:52.000Z",
        "orgId": "ea63fd80-a441-4c7b-ba78-e48a8071cae2",
        "shortName": "netflix"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2021-001.md"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security-report@netflix.com",
          "ID": "CVE-2021-28099",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "Netflix OSS Hollow",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "All versions"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "In Netflix OSS Hollow, since the Files.exists(parent) is run before creating the directories, an attacker can pre-create these directories with wide permissions. Additionally, since an insecure source of randomness is used, the file names to be created can be deterministically calculated."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "Local Information Disclosure"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2021-001.md",
              "refsource": "MISC",
              "url": "https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2021-001.md"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ea63fd80-a441-4c7b-ba78-e48a8071cae2",
    "assignerShortName": "netflix",
    "cveId": "CVE-2021-28099",
    "datePublished": "2021-03-23T20:28:52.000Z",
    "dateReserved": "2021-03-09T00:00:00.000Z",
    "dateUpdated": "2024-08-03T21:33:17.497Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

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