Vulnerability-Lookup

CNVD-2021-39033

Vulnerability from cnvd - Published: 2021-06-03

Title

Nextcloud存在未明漏洞（CNVD-2021-39033）

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，该漏洞源于当共享用户打开共享面板并试图删除此意外共享的“Create”特权时，Nextcloud服务器将静默地授予该共享读取特权，攻击者可利用该漏洞将Files Drop链接转换为联邦共享。

Severity

中

Patch Name

Nextcloud存在未明漏洞（CNVD-2021-39033）的补丁

Patch Description

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://github.com/nextcloud/security-advisories/security/advisories/GHSA-grph-cm44-p3jv

Reference

https://hackerone.com/reports/1167929

Impacted products

Name
['Nextcloud Nextcloud Server 19.0.11', 'Nextcloud Nextcloud Server 20.0.10', 'Nextcloud Nextcloud Server <21.0.2']

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-32655"
    }
  },
  "description": "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\n\nNextcloud Server\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5f53\u5171\u4eab\u7528\u6237\u6253\u5f00\u5171\u4eab\u9762\u677f\u5e76\u8bd5\u56fe\u5220\u9664\u6b64\u610f\u5916\u5171\u4eab\u7684\u201cCreate\u201d\u7279\u6743\u65f6\uff0cNextcloud\u670d\u52a1\u5668\u5c06\u9759\u9ed8\u5730\u6388\u4e88\u8be5\u5171\u4eab\u8bfb\u53d6\u7279\u6743\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5c06Files Drop\u94fe\u63a5\u8f6c\u6362\u4e3a\u8054\u90a6\u5171\u4eab\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://github.com/nextcloud/security-advisories/security/advisories/GHSA-grph-cm44-p3jv",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-39033",
  "openTime": "2021-06-03",
  "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\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u5f53\u5171\u4eab\u7528\u6237\u6253\u5f00\u5171\u4eab\u9762\u677f\u5e76\u8bd5\u56fe\u5220\u9664\u6b64\u610f\u5916\u5171\u4eab\u7684\u201cCreate\u201d\u7279\u6743\u65f6\uff0cNextcloud\u670d\u52a1\u5668\u5c06\u9759\u9ed8\u5730\u6388\u4e88\u8be5\u5171\u4eab\u8bfb\u53d6\u7279\u6743\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5c06Files Drop\u94fe\u63a5\u8f6c\u6362\u4e3a\u8054\u90a6\u5171\u4eab\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\u5b58\u5728\u672a\u660e\u6f0f\u6d1e\uff08CNVD-2021-39033\uff09\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Nextcloud Nextcloud Server 19.0.11",
      "Nextcloud Nextcloud Server 20.0.10",
      "Nextcloud Nextcloud Server \u003c21.0.2"
    ]
  },
  "referenceLink": "https://hackerone.com/reports/1167929",
  "serverity": "\u4e2d",
  "submitTime": "2021-06-03",
  "title": "Nextcloud\u5b58\u5728\u672a\u660e\u6f0f\u6d1e\uff08CNVD-2021-39033\uff09"
}

CVE-2021-32655 (GCVE-0-2021-32655)

Vulnerability from cvelistv5 – Published: 2021-06-01 20:55 – Updated: 2024-08-03 23:25

Title

Files Drop public link can be added as federated share

Summary

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.11, 20.0.10, and 21.0.2, an attacker is able to convert a Files Drop link to a federated share. This causes an issue on the UI side of the sharing user. When the sharing user opens the sharing panel and tries to remove the "Create" privileges of this unexpected share, Nextcloud server would silently grant the share read privileges. The vulnerability is patched in versions 19.0.11, 20.0.10 and 21.0.2. No workarounds are known to exist.

Severity

3.5 (Low)


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

CWE

CWE-241 - Improper Handling of Unexpected Data Type

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/nextcloud/security-advisories/…	x_refsource_CONFIRM
https://hackerone.com/reports/1167929	x_refsource_MISC
https://security.gentoo.org/glsa/202208-17	vendor-advisoryx_refsource_GENTOO

Impacted products

1 product

Vendor	Product	Version
nextcloud	security-advisories	Affected: < 19.0.11 Affected: >= 20.0.0, < 20.0.10 Affected: >= 21.0.0, < 21.0.2

Show details on NVD website

JSON

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{
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          "dateUpdated": "2024-08-03T23:25:31.037Z",
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            ],
            "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-grph-cm44-p3jv"
          },
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            ],
            "url": "https://hackerone.com/reports/1167929"
          },
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            "tags": [
              "vendor-advisory",
              "x_refsource_GENTOO",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202208-17"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
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          "product": "security-advisories",
          "vendor": "nextcloud",
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            },
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            },
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              "version": "\u003e= 21.0.0, \u003c 21.0.2"
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          ]
        }
      ],
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        {
          "lang": "en",
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            "userInteraction": "REQUIRED",
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            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2022-08-11T00:11:17.000Z",
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          "url": "https://security.gentoo.org/glsa/202208-17"
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      ],
      "source": {
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        "discovery": "UNKNOWN"
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      "title": "Files Drop public link can be added as federated share",
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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.