CVE-2023-28833 Unrestricted filenames for logo or favicon as admin in the theming settings in nextcloud server

2023-03-3018:49:38

CWE-22

GitHub_M

www.cve.org

nextcloud

server

unrestricted filenames

logo

favicon

theming

security vulnerability

upgraded recommendation

CVSS3

2.4

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

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

AI Score

8.9

Confidence

High

EPSS

0.002

Percentile

53.8%

JSON

Nextcloud server is an open source home cloud implementation. In affected versions admins of a server were able to upload a logo or a favicon and to provided a file name which was not restricted and could overwrite files in the appdata directory. Administrators may have access to overwrite these files by other means but this method could be exploited by tricking an admin into uploading a maliciously named file. It is recommended that the Nextcloud Server is upgraded to 24.0.10 or 25.0.4. Users unable to upgrade should avoid ingesting logo files from untrusted sources.

CNA Affected

[
  {
    "vendor": "nextcloud",
    "product": "security-advisories",
    "versions": [
      {
        "version": "< 24.0.10",
        "status": "affected"
      },
      {
        "version": ">= 25.0.0, < 25.0.4",
        "status": "affected"
      }
    ]
  }
]