CVE-2023-28998 Nextcloud Desktop client misbehaves with E2EE when the server returns empty list of metadata keys

2023-04-0412:45:42

CWE-325

GitHub_M

www.cve.org

nextcloud

vulnerability

e2ee

patch

upgrade

CVSS3

6.7

Attack Vector

PHYSICAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

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

EPSS

0.001

Percentile

42.6%

JSON

The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can gain full access to an end-to-end encrypted folder. They can decrypt files, recover the folder structure, and add new files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.

CNA Affected

[
  {
    "vendor": "nextcloud",
    "product": "security-advisories",
    "versions": [
      {
        "version": ">= 3.0.0, < 3.6.5",
        "status": "affected"
      }
    ]
  }
]