CVE-2023-28835

2023-03-3019:15:07

CWE-338

[email protected]

web.nvd.nist.gov

nextcloud

vulnerability

password complexity

upgrade

mitigation

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

AI Score

5.6

Confidence

High

EPSS

0.002

Percentile

52.3%

JSON

Nextcloud server is an open source home cloud implementation. In affected versions the generated fallback password when creating a share was using a weak complexity random number generator, so when the sharer did not change it the password could be guessable to an attacker willing to brute force it. It is recommended that the Nextcloud Server is upgraded to 24.0.10 or 25.0.4. This issue only affects users who do not have a password policy enabled, so enabling a password policy is an effective mitigation for users unable to upgrade.

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:::::-:::*