Multiple vulnerabilities in Nextcloud Server



Risk Low
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2023-28834
CVE-2023-28844
CWE-ID CWE-200
CWE-284
Exploitation vector Network
Public exploit N/A
Vulnerable software
 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) Information disclosure

EUVDB-ID: #VU74599

Risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-28834

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

Exploit availability: No

Description

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

The vulnerability exists due to excessive data output by the application. A remote user can obtain the full data directory path of the Nextcloud server from an API endpoint.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nextcloud Server: 23.0.0 - 25.0.5

Nextcloud Enterprise Server: 23.0.0 - 25.0.3

CPE2.3 External links

https://github.com/nextcloud/server/issues/33883
https://hackerone.com/reports/1690510
https://github.com/nextcloud/server/pull/36094
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5w64-6c42-rgcv


Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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

2) Improper access control

EUVDB-ID: #VU74598

Risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-28844

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 user without download permissions can bypass implemented security restrictions and download older versions of files from the server.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nextcloud Server: 24.0.4 - 25.0.3

Nextcloud Enterprise Server: 24.0.4 - 25.0.3

CPE2.3 External links

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-w47p-f66h-h2vj
https://github.com/nextcloud/server/pull/36113


Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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



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