CVE-2023-25821— Nextcloud download permissions can be changed by resharer
Quick assessment
Affected
nextcloud security-advisories
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud 24.0.7之前的24.0.x版本和25.0.1之前的25.0.x版本存在安全漏洞，该漏洞源于包含不正确的访问控制，如果还授予转发权限，则可以规避内部共享的安全视图。
Possible ATT&CK Techniques 1 AI
T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2023-25821
Vulnerability Information
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Vulnerability Title
Nextcloud download permissions can be changed by resharer
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud 24.0.7之前的24.0.x版本和25.0.1之前的25.0.x版本存在安全漏洞，该漏洞源于包含不正确的访问控制，如果还授予转发权限，则可以规避内部共享的安全视图。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| nextcloud | security-advisories | >= 24.0.4, < 24.0.7 | - |
|
II. Public POCs for CVE-2023-25821
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2023-25821 (1)
-
https://github.com/nextcloud/server/pull/34502 x_refsource_MISC
Vendor Advisories for CVE-2023-25821 (1)
Other References for CVE-2023-25821 (1)
-
https://hackerone.com/reports/1724016 x_refsource_MISC
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V. Comments for CVE-2023-25821
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