CVE-2023-25821

Nextcloud download permissions can be changed by resharer

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Nextcloud is an Open Source private cloud software. Versions 24.0.4 and above, prior to 24.0.7, and 25.0.0 and above, prior to 25.0.1, contain Improper Access Control. Secure view for internal shares can be circumvented if reshare permissions are also given. This issue is patched in versions 24.0.7 and 25.0.1. No workaround is available.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2023-02-15 CVE Reserved
2023-02-24 CVE Published
2024-08-02 CVE Updated
2024-08-02 First Exploit
2024-09-16 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-284: Improper Access Control

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC
https://hackerone.com/reports/1724016	2024-08-02

URL	Date	SRC
https://github.com/nextcloud/server/pull/34502	2023-11-07

URL	Date	SRC
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7w6h-5qgw-4j94	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 24.0.4 < 24.0.7 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 24.0.4 < 24.0.7"		-		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 24.0.4 < 24.0.7 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 24.0.4 < 24.0.7"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				25.0.0 Search vendor "Nextcloud" for product "Nextcloud Server" and version "25.0.0"		-		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				25.0.0 Search vendor "Nextcloud" for product "Nextcloud Server" and version "25.0.0"		enterprise		Affected