GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

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

Vulnerability from cvelistv5 – Published: 2021-03-23 20:28 – Updated: 2024-08-03 21:33
VLAI
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.
CWE
  • Local Information Disclosure
References
Impacted products
Vendor Product Version CPE status
n/a Netflix OSS Hollow Affected: All versions
Show details on NVD website

{
  "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",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2021-28099",
      "date": "2026-09-16",
      "epss": "0.00243",
      "percentile": "0.15614"
    },
    "fkie_nvd": {
      "configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:netflix:hollow:-:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"1E659DA4-A87C-478F-8A1E-F592AA631374\"}]}]}]",
      "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": "2024-11-21T05:59:05.440",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N\", \"baseScore\": 4.4, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"LOW\", \"integrityImpact\": \"LOW\", \"availabilityImpact\": \"NONE\"}, \"exploitabilityScore\": 1.8, \"impactScore\": 2.5}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:L/AC:L/Au:N/C:P/I:P/A:N\", \"baseScore\": 3.6, \"accessVector\": \"LOCAL\", \"accessComplexity\": \"LOW\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"PARTIAL\", \"integrityImpact\": \"PARTIAL\", \"availabilityImpact\": \"NONE\"}, \"baseSeverity\": \"LOW\", \"exploitabilityScore\": 3.9, \"impactScore\": 4.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
      "published": "2021-03-23T21:15:13.557",
      "references": "[{\"url\": \"https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2021-001.md\", \"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\"]}]",
      "sourceIdentifier": "security-report@netflix.com",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-330\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-28099\",\"sourceIdentifier\":\"security-report@netflix.com\",\"published\":\"2021-03-23T21:15:13.557\",\"lastModified\":\"2024-11-21T05:59:05.440\",\"vulnStatus\":\"Modified\",\"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\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N\",\"baseScore\":4.4,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.8,\"impactScore\":2.5}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:L/AC:L/Au:N/C:P/I:P/A:N\",\"baseScore\":3.6,\"accessVector\":\"LOCAL\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"NONE\"},\"baseSeverity\":\"LOW\",\"exploitabilityScore\":3.9,\"impactScore\":4.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-330\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:netflix:hollow:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"1E659DA4-A87C-478F-8A1E-F592AA631374\"}]}]}],\"references\":[{\"url\":\"https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2021-001.md\",\"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\"]}]}}",
    "redhat_vex": {
      "current_release_date": "2026-03-27T14:22:42+00:00",
      "cve": "CVE-2021-28099",
      "id": "CVE-2021-28099",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "CVE-2021-28099",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-28099.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

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.

Loading…

Detection rules are retrieved from Rulezet.

Loading…

Loading…

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.


Loading…