PT-2024-4380 · Nextcloud+2 · Nextcloud Server+3

Section1 · Published 2024-06-14 · Updated 2025-01-24 · CVE-2024-37887

Positive Technologies (AI Summary)

CVSS v2.0

4.0

Medium

Base vector

AV:N/AC:L/Au:S/C:P/I:N/A:N

Name of the Vulnerable Software and Affected Versions Nextcloud Server versions prior to 27.1.10 Nextcloud Server versions prior to 28.0.6 Nextcloud Server versions prior to 29.0.1 Nextcloud Enterprise Server versions prior to 27.1.10 Nextcloud Enterprise Server versions prior to 28.0.6 Nextcloud Enterprise Server versions prior to 29.0.1

Description The issue is related to incorrect access control in the Calendar component of Nextcloud Server, allowing sharees to read private shared calendar events' recurrence exceptions. This can enable a remote attacker to access confidential information.

Recommendations For Nextcloud Server versions prior to 27.1.10, upgrade to version 27.1.10 or later. For Nextcloud Server versions prior to 28.0.6, upgrade to version 28.0.6 or later. For Nextcloud Server versions prior to 29.0.1, upgrade to version 29.0.1 or later. For Nextcloud Enterprise Server versions prior to 27.1.10, upgrade to version 27.1.10 or later. For Nextcloud Enterprise Server versions prior to 28.0.6, upgrade to version 28.0.6 or later. For Nextcloud Enterprise Server versions prior to 29.0.1, upgrade to version 29.0.1 or later.

Exploit

Fix

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

ALT-PU-2024-14145

ALT-PU-2024-14169

ALT-PU-2025-1855

BDU:2024-04871

CVE-2024-37887

GHSA-H4XV-CJPM-J595

Affected Products

Alt Linux

Nextcloud Enterprise Server

Nextcloud Server

Red Os

References · 11

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/37xxx/CVE-2024-37887.json · Exploit
• https://github.com/nextcloud/server/pull/45309 · Patch
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h4xv-cjpm-j595 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-37887 · Security Note
• https://osv.dev/vulnerability/CVE-2024-37887 · Vendor Advisory
• https://bdu.fstec.ru/vul/2024-04871 · Security Note
• https://hackerone.com/reports/2479325 · Note
• https://redos.red-soft.ru/support/secure/uyazvimosti/support/secure/uyazvimosti/mnozhestvennye-uyazvimosti-nextcloud-27-06-24 · Note
• https://redos.red-soft.ru/support/secure · Note
• https://twitter.com/linuxpatch/status/1801663504245534998 · Twitter Post
• https://twitter.com/CVEnew/status/1801673780152177118 · Twitter Post