Vulnerability-Lookup

CNVD-2021-42392

Vulnerability from cnvd - Published: 2021-06-17

Title

Nextcloud server处理逻辑错误漏洞

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存在处理逻辑错误漏洞，该漏洞源于。Nextcloud server在19.0.11、20.0.10、21.0.2版本及之前版本中因为在限速考虑中没有包含IPv6子网，容易受到暴力破解攻击。攻击者可利用该漏洞绕过速率限制控制，比如Nextcloud brute-force protection。

Severity

中

Patch Name

Nextcloud server处理逻辑错误漏洞的补丁

Patch Description

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-2021-009

Reference

https://hackerone.com/reports/1154003

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-2021-22915"
    }
  },
  "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\u5904\u7406\u903b\u8f91\u9519\u8bef\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u3002Nextcloud server\u572819.0.11\u300120.0.10\u300121.0.2\u7248\u672c\u53ca\u4e4b\u524d\u7248\u672c\u4e2d\u56e0\u4e3a\u5728\u9650\u901f\u8003\u8651\u4e2d\u6ca1\u6709\u5305\u542bIPv6\u5b50\u7f51\uff0c\u5bb9\u6613\u53d7\u5230\u66b4\u529b\u7834\u89e3\u653b\u51fb\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u7ed5\u8fc7\u901f\u7387\u9650\u5236\u63a7\u5236\uff0c\u6bd4\u5982Nextcloud brute-force protection\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u53d1\u5e03\u5347\u7ea7\u8865\u4e01\u4ee5\u4fee\u590d\u6f0f\u6d1e\uff0c\u8865\u4e01\u83b7\u53d6\u94fe\u63a5\uff1a\r\nhttps://nextcloud.com/security/advisory/?id=NC-SA-2021-009",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-42392",
  "openTime": "2021-06-17",
  "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\u5904\u7406\u903b\u8f91\u9519\u8bef\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u3002Nextcloud server\u572819.0.11\u300120.0.10\u300121.0.2\u7248\u672c\u53ca\u4e4b\u524d\u7248\u672c\u4e2d\u56e0\u4e3a\u5728\u9650\u901f\u8003\u8651\u4e2d\u6ca1\u6709\u5305\u542bIPv6\u5b50\u7f51\uff0c\u5bb9\u6613\u53d7\u5230\u66b4\u529b\u7834\u89e3\u653b\u51fb\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u7ed5\u8fc7\u901f\u7387\u9650\u5236\u63a7\u5236\uff0c\u6bd4\u5982Nextcloud brute-force protection\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\u5904\u7406\u903b\u8f91\u9519\u8bef\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Nextcloud Nextcloud Server 19.0.11",
      "Nextcloud Nextcloud Server 20.0.10",
      "Nextcloud Nextcloud Server \u003c=21.0.2"
    ]
  },
  "referenceLink": "https://hackerone.com/reports/1154003",
  "serverity": "\u4e2d",
  "submitTime": "2021-06-17",
  "title": "Nextcloud server\u5904\u7406\u903b\u8f91\u9519\u8bef\u6f0f\u6d1e"
}

CVE-2021-22915 (GCVE-0-2021-22915)

Vulnerability from cvelistv5 – Published: 2021-06-11 15:49 – Updated: 2024-08-03 18:58

Summary

Nextcloud server before 19.0.11, 20.0.10, 21.0.2 is vulnerable to brute force attacks due to lack of inclusion of IPv6 subnets in rate-limiting considerations. This could potentially result in an attacker bypassing rate-limit controls such as the Nextcloud brute-force protection.

Severity

No CVSS data available.

CWE

CWE-307 - Brute Force (CWE-307)

Assigner

hackerone mitre root

References

4 references

URL	Tags
https://hackerone.com/reports/1154003	x_refsource_MISC
https://nextcloud.com/security/advisory/?id=NC-SA…	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA

Impacted products

1 product

Vendor	Product	Version
n/a	Nextcloud Server	Affected: Fixed in 19.0.11, 20.0.10, 21.0.2

Show details on NVD website

JSON

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{
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            "url": "https://nextcloud.com/security/advisory/?id=NC-SA-2021-009"
          },
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        ],
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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.