CVE-2023-28833

2023-03-3019:15:06

CWE-22

CWE-434

[email protected]

web.nvd.nist.gov

nextcloud server

file upload

unrestricted filenames

file overwrite

upgrade recommended

CVSS3

8.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

AI Score

6.2

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.

Affected configurations

Nvd

Node

nextcloudnextcloud_serverRange23.0.0–23.0.14enterprise

nextcloudnextcloud_serverRange24.0.0–24.0.10-

nextcloudnextcloud_serverRange24.0.0–24.0.10enterprise

nextcloudnextcloud_serverRange25.0.0–25.0.4-

nextcloudnextcloud_serverRange25.0.0–25.0.4enterprise

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

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