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GitHub_MCVE-2021-32656

HistoryJun 01, 2021 - 10:15 p.m.

CVE-2021-32656

2021-06-0122:15:08

CWE-284

GitHub_M

web.nvd.nist.gov

nextcloud

server

vulnerability

federated share

data storage

access control

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS3

8.6

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

AI Score

8.3

Confidence

High

EPSS

0.001

Percentile

48.9%

JSON

Nextcloud Server is a Nextcloud package that handles data storage. A vulnerability in federated share exists in versions prior to 19.0.11, 20.0.10, and 21.0.2. An attacker can gain access to basic information about users of a server by accessing a public link that a legitimate server user added as a federated share. This happens because Nextcloud supports sharing registered users with other Nextcloud servers, which can be done automatically when selecting the “Add server automatically once a federated share was created successfully” setting. The vulnerability is patched in versions 19.0.11, 20.0.10, and 21.0.2 As a workaround, disable “Add server automatically once a federated share was created successfully” in the Nextcloud settings.

Affected configurations

Nvd

Vulners

Node

nextcloudnextcloud_serverRange<19.0.11

nextcloudnextcloud_serverRange20.0.0–20.0.10

nextcloudnextcloud_serverRange21.0.0–21.0.2

VendorProductVersionCPE
nextcloudnextcloud_server*cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
nextcloud	nextcloud_server	*	cpe:2.3:a:nextcloud:nextcloud_server::::::::

CNA Affected

[
  {
    "product": "security-advisories",
    "vendor": "nextcloud",
    "versions": [
      {
        "status": "affected",
        "version": "< 19.0.11"
      },
      {
        "status": "affected",
        "version": ">= 20.0.0, < 20.0.10"
      },
      {
        "status": "affected",
        "version": ">= 21.0.0, < 21.0.2"
      }
    ]
  }
]