Multiple vulnerabilities in Nextcloud Server and Enterprise Server

Published: 2023-11-21

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2023-48303 CVE-2023-48305
CWE-ID	CWE-284 CWE-312
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Nextcloud Server Client/Desktop applications / Messaging software Nextcloud Enterprise Server Client/Desktop applications / Messaging software
Vendor	Nextcloud

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper access control

EUVDB-ID: #VU83357

Risk: Low

CVSSv3.1: 2.1 [CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-48303

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote user to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions. A remote administrator can change authentication details of user configured external storage.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nextcloud Server: 25.0.0 - 27.0.2

Nextcloud Enterprise Server: 25.0.0 - 27.0.2

External links

http://github.com/nextcloud/security-advisories/security/advisories/GHSA-2448-44rp-c7hh

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Cleartext storage of sensitive information

EUVDB-ID: #VU83358

Risk: Low

CVSSv3.1: 3.7 [CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-48305

CWE-ID: CWE-312 - Cleartext Storage of Sensitive Information

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to the log level is set to debug the user_ldap app logged user passwords in plaintext into the log file. A local administrator can gain access to sensitive information.