Vulnerability-Lookup

CNVD-2022-18420

Vulnerability from cnvd - Published: 2022-03-11

Title

Nextcloud代码执行漏洞

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存在代码执行漏洞，该漏洞源于Nextcloud支持为用户提供的文件内容呈现图像预览，攻击者可利用该漏洞通过存在缺陷的第三方库执行任意代码。

Severity

高

Patch Name

Nextcloud代码执行漏洞的补丁

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存在代码执行漏洞，该漏洞源于Nextcloud支持为用户提供的文件内容呈现图像预览，攻击者可利用该漏洞通过存在缺陷的第三方库执行任意代码。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

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-m682-v4g9-wrq7

Reference

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m682-v4g9-wrq7

Impacted products

Name
['Nextcloud Nextcloud <20.0.12', 'Nextcloud Nextcloud <21.0.4', 'Nextcloud Nextcloud <22.1.0']

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-32802",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2021-32802"
    }
  },
  "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\u5b58\u5728\u4ee3\u7801\u6267\u884c\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8eNextcloud\u652f\u6301\u4e3a\u7528\u6237\u63d0\u4f9b\u7684\u6587\u4ef6\u5185\u5bb9\u5448\u73b0\u56fe\u50cf\u9884\u89c8\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u5b58\u5728\u7f3a\u9677\u7684\u7b2c\u4e09\u65b9\u5e93\u6267\u884c\u4efb\u610f\u4ee3\u7801\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-m682-v4g9-wrq7",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2022-18420",
  "openTime": "2022-03-11",
  "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\u5b58\u5728\u4ee3\u7801\u6267\u884c\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8eNextcloud\u652f\u6301\u4e3a\u7528\u6237\u63d0\u4f9b\u7684\u6587\u4ef6\u5185\u5bb9\u5448\u73b0\u56fe\u50cf\u9884\u89c8\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u901a\u8fc7\u5b58\u5728\u7f3a\u9677\u7684\u7b2c\u4e09\u65b9\u5e93\u6267\u884c\u4efb\u610f\u4ee3\u7801\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\u4ee3\u7801\u6267\u884c\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": [
      "Nextcloud Nextcloud \u003c20.0.12",
      "Nextcloud Nextcloud \u003c21.0.4",
      "Nextcloud Nextcloud \u003c22.1.0"
    ]
  },
  "referenceLink": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m682-v4g9-wrq7",
  "serverity": "\u9ad8",
  "submitTime": "2021-09-09",
  "title": "Nextcloud\u4ee3\u7801\u6267\u884c\u6f0f\u6d1e"
}

CVE-2021-32802 (GCVE-0-2021-32802)

Vulnerability from cvelistv5 – Published: 2021-09-07 21:45 – Updated: 2024-08-03 23:33

Title

Preview generation used third-party library not suited for user-generated content in Nextcloud server

Summary

Nextcloud server is an open source, self hosted personal cloud. Nextcloud supports rendering image previews for user provided file content. For some image types, the Nextcloud server was invoking a third-party library that wasn't suited for untrusted user-supplied content. There are several security concerns with passing user-generated content to this library, such as Server-Side-Request-Forgery, file disclosure or potentially executing code on the system. The risk depends on your system configuration and the installed library version. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.1.0. These versions do not use this library anymore. As a workaround users may disable previews by setting `enable_previews` to `false` in `config.php`.

Severity

9.3 (Critical)


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

CWE

CWE-829 - Inclusion of Functionality from Untrusted Control Sphere

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/nextcloud/security-advisories/…	x_refsource_CONFIRM
https://hackerone.com/reports/1261413	x_refsource_MISC
https://docs.nextcloud.com/server/21/admin_manual…	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: < 20.0.12 Affected: >= 21.0.0, < 21.0.4 Affected: >= 22.0.0, < 22.1.0

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JSON

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T23:33:55.927Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m682-v4g9-wrq7"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://hackerone.com/reports/1261413"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://docs.nextcloud.com/server/21/admin_manual/configuration_files/previews_configuration.html#disabling-previews"
          },
          {
            "name": "GLSA-202208-17",
            "tags": [
              "vendor-advisory",
              "x_refsource_GENTOO",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202208-17"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "security-advisories",
          "vendor": "nextcloud",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 20.0.12"
            },
            {
              "status": "affected",
              "version": "\u003e= 21.0.0, \u003c 21.0.4"
            },
            {
              "status": "affected",
              "version": "\u003e= 22.0.0, \u003c 22.1.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Nextcloud server is an open source, self hosted personal cloud. Nextcloud supports rendering image previews for user provided file content. For some image types, the Nextcloud server was invoking a third-party library that wasn\u0027t suited for untrusted user-supplied content. There are several security concerns with passing user-generated content to this library, such as Server-Side-Request-Forgery, file disclosure or potentially executing code on the system. The risk depends on your system configuration and the installed library version. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.1.0. These versions do not use this library anymore. As a workaround users may disable previews by setting `enable_previews` to `false` in `config.php`."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-829",
              "description": "CWE-829: Inclusion of Functionality from Untrusted Control Sphere",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2022-08-11T00:10:42.000Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
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        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m682-v4g9-wrq7"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://hackerone.com/reports/1261413"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://docs.nextcloud.com/server/21/admin_manual/configuration_files/previews_configuration.html#disabling-previews"
        },
        {
          "name": "GLSA-202208-17",
          "tags": [
            "vendor-advisory",
            "x_refsource_GENTOO"
          ],
          "url": "https://security.gentoo.org/glsa/202208-17"
        }
      ],
      "source": {
        "advisory": "GHSA-m682-v4g9-wrq7",
        "discovery": "UNKNOWN"
      },
      "title": "Preview generation used third-party library not suited for user-generated content in Nextcloud server",
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2021-32802",
          "STATE": "PUBLIC",
          "TITLE": "Preview generation used third-party library not suited for user-generated content in Nextcloud server"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "security-advisories",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "\u003c 20.0.12"
                          },
                          {
                            "version_value": "\u003e= 21.0.0, \u003c 21.0.4"
                          },
                          {
                            "version_value": "\u003e= 22.0.0, \u003c 22.1.0"
                          }
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                      }
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                "vendor_name": "nextcloud"
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            }
          ]
        },
        "impact": {
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            "attackVector": "NETWORK",
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            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L",
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                  "value": "CWE-829: Inclusion of Functionality from Untrusted Control Sphere"
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              "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m682-v4g9-wrq7",
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              "url": "https://hackerone.com/reports/1261413"
            },
            {
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              "url": "https://docs.nextcloud.com/server/21/admin_manual/configuration_files/previews_configuration.html#disabling-previews"
            },
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              "url": "https://security.gentoo.org/glsa/202208-17"
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    "datePublished": "2021-09-07T21:45:11.000Z",
    "dateReserved": "2021-05-12T00:00:00.000Z",
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    "state": "PUBLISHED"
  },
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  "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.

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.

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CNVD-2022-18420

CVE-2021-32802 (GCVE-0-2021-32802)

Tags

Sightings

Nomenclature

Related by attack behaviour