PT-2023-8882 · Nextcloud+2 · Nextcloud Enterprise Server+3

Arianitisufi + 2 · Published 2023-11-21 · Updated 2025-01-24 · CVE-2023-48239

Positive Technologies (AI Summary)

CVSS v3.1

8.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Nextcloud Server versions 25.0.0 through 25.0.12 Nextcloud Server versions 26.0.0 through 26.0.7 Nextcloud Server versions prior to 27.1.3 Nextcloud Enterprise Server versions 20.0.0 through 20.0.14.15 Nextcloud Enterprise Server versions 21.0.0 through 21.0.9.12 Nextcloud Enterprise Server versions 22.2.0 through 22.2.10.14 Nextcloud Enterprise Server versions 23.0.0 through 23.0.12.11 Nextcloud Enterprise Server versions 24.0.0 through 24.0.12.7

Description The issue is related to the possibility of updating any personal or global external storage, making it inaccessible for everyone else. This can be exploited by a malicious user to bypass existing access restriction policies.

Recommendations For Nextcloud Server versions 25.0.0 through 25.0.12, update to version 25.0.13 or later. For Nextcloud Server versions 26.0.0 through 26.0.7, update to version 26.0.8 or later. For Nextcloud Server versions prior to 27.1.3, update to version 27.1.3 or later. For Nextcloud Enterprise Server versions 20.0.0 through 20.0.14.15, update to version 20.0.14.16 or later. For Nextcloud Enterprise Server versions 21.0.0 through 21.0.9.12, update to version 21.0.9.13 or later. For Nextcloud Enterprise Server versions 22.2.0 through 22.2.10.14, update to version 22.2.10.15 or later. For Nextcloud Enterprise Server versions 23.0.0 through 23.0.12.11, update to version 23.0.12.12 or later. For Nextcloud Enterprise Server versions 24.0.0 through 24.0.12.7, update to version 24.0.12.8 or later. As a temporary workaround, consider disabling the app files external to retain configurations until a patched version has been deployed.

Exploit

Fix

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

ALT-PU-2023-7785

ALT-PU-2023-7786

ALT-PU-2024-1230

ALT-PU-2025-1855

BDU:2024-02545

CVE-2023-48239

GHSA-F962-HW26-G267

Affected Products

Alt Linux

Nextcloud Enterprise Server

Nextcloud Server

Red Os

References · 11

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/48xxx/CVE-2023-48239.json · Exploit
• 🔥 https://hackerone.com/reports/2212627 · Exploit
• https://github.com/nextcloud/server/pull/41123 · Patch
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f962-hw26-g267 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-48239 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-48239 · Security Note
• https://bdu.fstec.ru/vul/2024-02545 · Security Note
• https://t.me/cvenotify/61410 · Telegram Post
• https://redos.red-soft.ru/support/secure · Note
• https://t.me/cvenotify/61020 · Telegram Post
• https://redos.red-soft.ru/support/secure/uyazvimosti/support/secure/uyazvimosti/mnozhestvennye-uyazvimosti-nextcloud-cve-2023-48301-cve-2023-48302 · Note