cnvd - cnvd-2021-51798

cnvd-2021-51798

Vulnerability from cnvd

Title: Nextcloud信任管理问题漏洞（CNVD-2021-51798）

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 Android Client在3.16.1之前版本存在信任管理问题漏洞，该漏洞源于Nextcloud Android客户端跳过了一个涉及客户端检查私钥是否属于之前下载的公共证书的步骤。如果Nextcloud实例提供了一个恶意公钥，那么数据将为此密钥进行加密，从而可以被恶意参与者访问。攻击者可利用该漏洞获取敏感信息。

Severity: 中

Patch Name: Nextcloud信任管理问题漏洞（CNVD-2021-51798）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。

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://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736

Reference: https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736

Impacted products

Name
Nextcloud Nextcloud Android Client <3.16.1

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-32727",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2021-32727"
    }
  },
  "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 Android Client\u57283.16.1\u4e4b\u524d\u7248\u672c\u5b58\u5728\u4fe1\u4efb\u7ba1\u7406\u95ee\u9898\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8eNextcloud Android\u5ba2\u6237\u7aef\u8df3\u8fc7\u4e86\u4e00\u4e2a\u6d89\u53ca\u5ba2\u6237\u7aef\u68c0\u67e5\u79c1\u94a5\u662f\u5426\u5c5e\u4e8e\u4e4b\u524d\u4e0b\u8f7d\u7684\u516c\u5171\u8bc1\u4e66\u7684\u6b65\u9aa4\u3002\u5982\u679cNextcloud\u5b9e\u4f8b\u63d0\u4f9b\u4e86\u4e00\u4e2a\u6076\u610f\u516c\u94a5\uff0c\u90a3\u4e48\u6570\u636e\u5c06\u4e3a\u6b64\u5bc6\u94a5\u8fdb\u884c\u52a0\u5bc6\uff0c\u4ece\u800c\u53ef\u4ee5\u88ab\u6076\u610f\u53c2\u4e0e\u8005\u8bbf\u95ee\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u83b7\u53d6\u654f\u611f\u4fe1\u606f\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://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-51798",
  "openTime": "2021-07-19",
  "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 Android Client\u57283.16.1\u4e4b\u524d\u7248\u672c\u5b58\u5728\u4fe1\u4efb\u7ba1\u7406\u95ee\u9898\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8eNextcloud Android\u5ba2\u6237\u7aef\u8df3\u8fc7\u4e86\u4e00\u4e2a\u6d89\u53ca\u5ba2\u6237\u7aef\u68c0\u67e5\u79c1\u94a5\u662f\u5426\u5c5e\u4e8e\u4e4b\u524d\u4e0b\u8f7d\u7684\u516c\u5171\u8bc1\u4e66\u7684\u6b65\u9aa4\u3002\u5982\u679cNextcloud\u5b9e\u4f8b\u63d0\u4f9b\u4e86\u4e00\u4e2a\u6076\u610f\u516c\u94a5\uff0c\u90a3\u4e48\u6570\u636e\u5c06\u4e3a\u6b64\u5bc6\u94a5\u8fdb\u884c\u52a0\u5bc6\uff0c\u4ece\u800c\u53ef\u4ee5\u88ab\u6076\u610f\u53c2\u4e0e\u8005\u8bbf\u95ee\u3002\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u83b7\u53d6\u654f\u611f\u4fe1\u606f\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\u4fe1\u4efb\u7ba1\u7406\u95ee\u9898\u6f0f\u6d1e\uff08CNVD-2021-51798\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "Nextcloud Nextcloud Android Client \u003c3.16.1"
  },
  "referenceLink": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736",
  "serverity": "\u4e2d",
  "submitTime": "2021-07-15",
  "title": "Nextcloud\u4fe1\u4efb\u7ba1\u7406\u95ee\u9898\u6f0f\u6d1e\uff08CNVD-2021-51798\uff09"
}

CVE-2021-32727 (GCVE-0-2021-32727)

Vulnerability from cvelistv5

Published

2021-07-12 20:40

Modified

2024-08-03 23:33

Severity ?

5.7 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

CWE

CWE-295 - Improper Certificate Validation

Summary

Nextcloud Android Client is the Android client for Nextcloud. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.16.1, the Nextcloud Android client skipped a step that involved the client checking if a private key belonged to a previously downloaded public certificate. If the Nextcloud instance served a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. The vulnerability is patched in version 3.16.1. As a workaround, do not add additional end-to-end encrypted devices to a user account.

References

▼	URL	Tags
	https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736	x_refsource_CONFIRM
	https://github.com/nextcloud/android/pull/8438	x_refsource_MISC
	https://hackerone.com/reports/1189162	x_refsource_MISC
	https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devices	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	nextcloud	security-advisories	Version: < 3.16.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T23:33:54.870Z",
          "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-5v33-r9cm-7736"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/nextcloud/android/pull/8438"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://hackerone.com/reports/1189162"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devices"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "security-advisories",
          "vendor": "nextcloud",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.16.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Nextcloud Android Client is the Android client for Nextcloud. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.16.1, the Nextcloud Android client skipped a step that involved the client checking if a private key belonged to a previously downloaded public certificate. If the Nextcloud instance served a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. The vulnerability is patched in version 3.16.1. As a workaround, do not add additional end-to-end encrypted devices to a user account."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-295",
              "description": "CWE-295: Improper Certificate Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-07-12T20:40:13",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nextcloud/android/pull/8438"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://hackerone.com/reports/1189162"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devices"
        }
      ],
      "source": {
        "advisory": "GHSA-5v33-r9cm-7736",
        "discovery": "UNKNOWN"
      },
      "title": "End-to-end encryption device setup did not verify public key",
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2021-32727",
          "STATE": "PUBLIC",
          "TITLE": "End-to-end encryption device setup did not verify public key"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "security-advisories",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "\u003c 3.16.1"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "nextcloud"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "Nextcloud Android Client is the Android client for Nextcloud. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.16.1, the Nextcloud Android client skipped a step that involved the client checking if a private key belonged to a previously downloaded public certificate. If the Nextcloud instance served a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. The vulnerability is patched in version 3.16.1. As a workaround, do not add additional end-to-end encrypted devices to a user account."
            }
          ]
        },
        "impact": {
          "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-295: Improper Certificate Validation"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736",
              "refsource": "CONFIRM",
              "url": "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736"
            },
            {
              "name": "https://github.com/nextcloud/android/pull/8438",
              "refsource": "MISC",
              "url": "https://github.com/nextcloud/android/pull/8438"
            },
            {
              "name": "https://hackerone.com/reports/1189162",
              "refsource": "MISC",
              "url": "https://hackerone.com/reports/1189162"
            },
            {
              "name": "https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devices",
              "refsource": "MISC",
              "url": "https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devices"
            }
          ]
        },
        "source": {
          "advisory": "GHSA-5v33-r9cm-7736",
          "discovery": "UNKNOWN"
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2021-32727",
    "datePublished": "2021-07-12T20:40:13",
    "dateReserved": "2021-05-12T00:00:00",
    "dateUpdated": "2024-08-03T23:33:54.870Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted