CVE-2023-35928 Nextcloud user scoped external storage can be used to gather credentials of other users

2023-06-2320:58:33

CWE-274

GitHub_M

www.cve.org

nextcloud

data storage

vulnerability

patched

external storage

credentials gathering

user scoped

workaround

app files_external

configuration setting

administration

8.4 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

8.8 High

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

64.6%

JSON

Nextcloud Server is a space for data storage on Nextcloud, a self-hosted productivity playform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 19.0.0 until 19.0.13.9, 20.0.0 until 20.0.14.14, 21.0.0 until 21.0.9.12, 22.0.0 until 22.2.10.12, 23.0.0 until 23.0.12.7, 24.0.0 until 24.0.12.2, 25.0.0 until 25.0.7, and 26.0.0 until 26.0.2, a user could use this functionality to get access to the login credentials of another user and take over their account. This issue has been patched in Nextcloud Server versions 25.0.7 and 26.0.2 and NextCloud Enterprise Server versions 19.0.13.9, 20.0.14.14, 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, and 26.0.2.

Three workarounds are available. Disable app files_external. Change config setting “Allow users to mount external storage” to disabled in “Administration” > “External storage” settings …/index.php/settings/admin/externalstorages. Change config setting to disallow users to create external storages in “Administration” > “External storage” settings …/index.php/settings/admin/externalstorages with the types FTP, Nextcloud, SFTP, and/or WebDAV.

CNA Affected

[
  {
    "vendor": "nextcloud",
    "product": "security-advisories",
    "versions": [
      {
        "version": "Nextcloud Enterprise Server >= 19.0.0, < 19.0.13.9",
        "status": "affected"
      },
      {
        "version": "Nextcloud Enterprise Server >= 20.0.0.0, < 20.0.14.14",
        "status": "affected"
      },
      {
        "version": "Nextcloud Enterprise Server >= 21.0.0.0, < 21.0.9.12",
        "status": "affected"
      },
      {
        "version": "Nextcloud Enterprise Server >= 22.0.0.0, < 22.2.10.12",
        "status": "affected"
      },
      {
        "version": "Nextcloud Enterprise Server >= 23.0.0.0, < 23.0.12.7",
        "status": "affected"
      },
      {
        "version": "Nextcloud Enterprise Server >= 24.0.0.0, < 24.0.12.2",
        "status": "affected"
      },
      {
        "version": "Nextcloud Enterprise Server >= 25.0.0, < 25.0.7 ",
        "status": "affected"
      },
      {
        "version": "Nextcloud Enterprise Server >= 26.0.0, < 26.0.2",
        "status": "affected"
      },
      {
        "version": "Nextcloud Server >= 25.0.0, < 25.0.7",
        "status": "affected"
      },
      {
        "version": "Nextcloud Server >= 26.0.0, < 26.0.2",
        "status": "affected"
      }
    ]
  }
]