CVE-2023-48239 Nextcloud Server users can make external storage mount points inaccessible for other users

2023-11-2121:02:35

CWE-284

GitHub_M

www.cve.org

nextcloud

data storage

external storage

security issue

patch

workaround

CVSS3

8.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

HIGH

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

AI Score

8.6

Confidence

High

EPSS

0.001

Percentile

20.3%

JSON

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Server and starting in version 20.0.0 and prior to versions 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0.12.12, 24.0.12.8, 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Enterprise Server, a malicious user could update any personal or global external storage, making them inaccessible for everyone else as well. Nextcloud Server 25.0.13, 26.0.8, and 27.1.3 and Nextcloud Enterprise Server is upgraded to 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0.12.12, 24.0.12.8, 25.0.13, 26.0.8, and 27.1.3 contain a patch for this issue. As a workaround, disable app files_external. This workaround also makes the external storage inaccessible but retains the configurations until a patched version has been deployed.

CNA Affected

[
  {
    "vendor": "nextcloud",
    "product": "security-advisories",
    "versions": [
      {
        "version": ">= 25.0.0, < 25.0.13",
        "status": "affected"
      },
      {
        "version": ">= 26.0.0, < 26.0.8",
        "status": "affected"
      },
      {
        "version": ">= 27.0.0, < 27.1.3",
        "status": "affected"
      },
      {
        "version": ">= 20.0.0, < 20.0.14.16",
        "status": "affected"
      },
      {
        "version": ">= 21.0.0, < 21.0.9.13",
        "status": "affected"
      },
      {
        "version": ">= 22.0.0, < 22.2.10.15",
        "status": "affected"
      },
      {
        "version": ">= 23.0.0, < 23.0.12.12",
        "status": "affected"
      },
      {
        "version": ">= 24.0.0, < 24.0.12.8",
        "status": "affected"
      }
    ]
  }
]