PT-2023-3420 · Nextcloud+2 · Nextcloud Server+3

Rullzer · Published 2023-06-23 · Updated 2025-01-24 · CVE-2023-35172

Positive Technologies (AI Summary)

CVSS v3.1

8.7

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Nextcloud Server versions 25.0.0 through 25.0.7 Nextcloud Server versions 26.0.0 through 26.0.2 Nextcloud Enterprise Server versions 21.0.0 through 21.0.9.12 Nextcloud Enterprise Server versions 22.0.0 through 22.2.10.12 Nextcloud Enterprise Server versions 23.0.0 through 23.0.12.7 Nextcloud Enterprise Server versions 24.0.0 through 24.0.12.2 Nextcloud Enterprise Server versions 25.0.0 through 25.0.7 Nextcloud Enterprise Server versions 26.0.0 through 26.0.2

Description The issue is related to the lack of protection against brute-force attacks during the password reset procedure in Nextcloud, a self-hosted productivity platform. This allows a remote attacker to exploit the vulnerability and gain unauthorized access by bruteforcing password reset links.

Recommendations For Nextcloud Server versions 25.0.0 through 25.0.7, update to version 25.0.7 or later. For Nextcloud Server versions 26.0.0 through 26.0.2, update to version 26.0.2 or later. For Nextcloud Enterprise Server versions 21.0.0 through 21.0.9.12, update to version 21.0.9.12 or later. For Nextcloud Enterprise Server versions 22.0.0 through 22.2.10.12, update to version 22.2.10.12 or later. For Nextcloud Enterprise Server versions 23.0.0 through 23.0.12.7, update to version 23.0.12.7 or later. For Nextcloud Enterprise Server versions 24.0.0 through 24.0.12.2, update to version 24.0.12.2 or later. For Nextcloud Enterprise Server versions 25.0.0 through 25.0.7, update to version 25.0.7 or later. For Nextcloud Enterprise Server versions 26.0.0 through 26.0.2, update to version 26.0.2 or later.

Exploit

Fix

Improper Restriction of Excessive Authentication Attempts

Weakness Enumeration

CWE-274

CWE-307

Related Identifiers

ALT-PU-2023-7785

ALT-PU-2025-1855

BDU:2023-03598

BDU:2023-03776

CVE-2023-35172

GHSA-MJF5-P765-QMR6

Affected Products

Alt Linux

Nextcloud Enterprise Server

Nextcloud Server

Red Os

References · 16

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/35xxx/CVE-2023-35172.json · Exploit
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-mjf5-p765-qmr6 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-35172 · Security Note
• https://osv.dev/vulnerability/CVE-2023-35172 · Vendor Advisory
• https://bdu.fstec.ru/vul/2023-03598 · Security Note
• https://bdu.fstec.ru/vul/2023-03776 · Security Note
• https://github.com/nextcloud/server/pull/38265 · Note
• https://github.com/nextcloud/server/pull/38267 · Note
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-637g-xp2c-qh5h · Note
• https://redos.red-soft.ru/support/secure/uyazvimosti/support/secure/uyazvimosti/mnozhestvennye-uyazvimosti-nextcloud-server-cve-2023-35172-cve-2023-35928 · Note
• https://hackerone.com/users/sign_in · Note
• https://t.me/cvenotify/53005 · Telegram Post
• https://redos.red-soft.ru/support/secure/uyazvimosti/mnozhestvennye-uyazvimosti-nextcloud-server-cve-2023-35172-cve-2023-35928 · Note
• https://t.me/cvenotify/52989 · Telegram Post
• https://hackerone.com/reports/1978882 · Note