CVE-2023-28643

Potential share collision for recipients when caching is enabled in nextcloud server

Severity Score

8.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Nextcloud server is an open source home cloud implementation. In affected versions when a recipient receives 2 shares with the same name, while a memory cache is configured, the second share will replace the first one instead of being renamed to `{name} (2)`. It is recommended that the Nextcloud Server is upgraded to 25.0.3 or 24.0.9. Users unable to upgrade should avoid sharing 2 folders with the same name to the same user.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2023-03-20 CVE Reserved
2023-03-30 CVE Published
2024-04-05 EPSS Updated
2024-08-02 CVE Updated
2024-08-02 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-706: Use of Incorrectly-Resolved Name or Reference

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC
https://github.com/nextcloud/server/issues/34015	2024-08-02

URL	Date	SRC
https://github.com/nextcloud/server/pull/36047	2023-04-06

URL	Date	SRC
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hhq4-4pr8-wm27	2023-04-06

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"				>= 24.0.0 < 24.0.9 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 24.0.0 < 24.0.9"		-		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 24.0.0 < 24.0.9 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 24.0.0 < 24.0.9"		enterprise		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 25.0.0 < 25.0.3 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 25.0.0 < 25.0.3"		-		Affected
Nextcloud Search vendor "Nextcloud"		Nextcloud Server Search vendor "Nextcloud" for product "Nextcloud Server"				>= 25.0.0 < 25.0.3 Search vendor "Nextcloud" for product "Nextcloud Server" and version " >= 25.0.0 < 25.0.3"		enterprise		Affected