Vulnerability-Lookup

CNVD-2021-09039

Vulnerability from cnvd - Published: 2021-02-04

Title

Nextcloud Server资源管理错误漏洞

Description

Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud Server 存在安全漏洞。该漏洞源于程序缺少输入验证，使用户无法在工作流规则中存储无限的数据，从而在以后与这些规则进行交互和使用时导致负载和潜在的DDoS。目前没有详细的漏洞细节提供。

Severity

中

Patch Name

Nextcloud Server资源管理错误漏洞的补丁

Patch Description

Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud Server 存在安全漏洞。该漏洞源于程序缺少输入验证，使用户无法在工作流规则中存储无限的数据，从而在以后与这些规则进行交互和使用时导致负载和潜在的DDoS。目前没有详细的漏洞细节提供。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

目前厂商已发布升级补丁以修复漏洞，补丁获取链接：https://nextcloud.com/security/advisory/?id=NC-SA-2021-001

Reference

https://nvd.nist.gov/vuln/detail/CVE-2020-8293

Impacted products

Name
['Nextcloud Nextcloud Server <20.0.2', 'Nextcloud Nextcloud Server <19.0.5', 'Nextcloud Nextcloud Server <18.0.11']

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-8293",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-8293"
    }
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  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-09039",
  "openTime": "2021-02-04",
  "patchDescription": "Nextcloud\u662f\u5fb7\u56fdNextcloud\u516c\u53f8\u7684\u4e00\u5957\u5f00\u6e90\u7684\u81ea\u6258\u7ba1\u6587\u4ef6\u540c\u6b65\u548c\u5171\u4eab\u7684\u901a\u4fe1\u5e94\u7528\u5e73\u53f0\u3002\r\n\r\nNextcloud Server \u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\u3002\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u7a0b\u5e8f\u7f3a\u5c11\u8f93\u5165\u9a8c\u8bc1\uff0c\u4f7f\u7528\u6237\u65e0\u6cd5\u5728\u5de5\u4f5c\u6d41\u89c4\u5219\u4e2d\u5b58\u50a8\u65e0\u9650\u7684\u6570\u636e\uff0c\u4ece\u800c\u5728\u4ee5\u540e\u4e0e\u8fd9\u4e9b\u89c4\u5219\u8fdb\u884c\u4ea4\u4e92\u548c\u4f7f\u7528\u65f6\u5bfc\u81f4\u8d1f\u8f7d\u548c\u6f5c\u5728\u7684DDoS\u3002\u76ee\u524d\u6ca1\u6709\u8be6\u7ec6\u7684\u6f0f\u6d1e\u7ec6\u8282\u63d0\u4f9b\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Nextcloud Server\u8d44\u6e90\u7ba1\u7406\u9519\u8bef\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": [
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      "Nextcloud Nextcloud Server \u003c19.0.5",
      "Nextcloud Nextcloud Server \u003c18.0.11"
    ]
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2020-8293",
  "serverity": "\u4e2d",
  "submitTime": "2021-02-03",
  "title": "Nextcloud Server\u8d44\u6e90\u7ba1\u7406\u9519\u8bef\u6f0f\u6d1e"
}

CVE-2020-8293 (GCVE-0-2020-8293)

Vulnerability from cvelistv5 – Published: 2021-01-26 16:33 – Updated: 2024-08-04 09:56

Summary

A missing input validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows users to store unlimited data in workflow rules causing load and potential DDoS on later interactions and usage with those rules.

Severity

No CVSS data available.

CWE

CWE-400 - Denial of Service (CWE-400)

Assigner

hackerone mitre root

References

2 references

URL	Tags
https://hackerone.com/reports/1018146	x_refsource_MISC
https://nextcloud.com/security/advisory/?id=NC-SA…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
n/a	Nextcloud Server	Affected: Fixed in 20.0.2, 19.0.5, 18.0.11

Show details on NVD website

JSON

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          "dateUpdated": "2024-08-04T09:56:28.329Z",
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          },
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            ],
            "url": "https://nextcloud.com/security/advisory/?id=NC-SA-2021-001"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
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          "vendor": "n/a",
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}

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.

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.