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CVE-2023-28646— App lockout in nextcloud Android app can be bypassed via thirdparty apps

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 Android app是德国Nextcloud公司的一款基于Android平台，用于访问Nextcloud服务器的移动应用程序。 Nextcloud android 3.7.0版本至3.24.1之前版本存在安全漏洞，该漏洞源于可以通过第三方应用程序绕过 Nextcloud Android Pin/passcode保护。

CVSS 4.4 · Medium EPSS 0.23% · P14
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I. Basic Information for CVE-2023-28646

Vulnerability Information
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Vulnerability Title
App lockout in nextcloud Android app can be bypassed via thirdparty apps
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud android is an android app for interfacing with the nextcloud home server ecosystem. In versions from 3.7.0 and before 3.24.1 an attacker that has access to the unlocked physical device can bypass the Nextcloud Android Pin/passcode protection via a thirdparty app. This allows to see meta information like sharer, sharees and activity of files. It is recommended that the Nextcloud Android app is upgraded to 3.24.1. There are no known workarounds for this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:P/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud Android app 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nextcloud Android app是德国Nextcloud公司的一款基于Android平台，用于访问Nextcloud服务器的移动应用程序。 Nextcloud android 3.7.0版本至3.24.1之前版本存在安全漏洞，该漏洞源于可以通过第三方应用程序绕过 Nextcloud Android Pin/passcode保护。
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 >= 3.7.0, < 3.24.1 -

II. Public POCs for CVE-2023-28646

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III. Intelligence Information for CVE-2023-28646

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Patches & Fixes for CVE-2023-28646 (1)

Vendor Advisories for CVE-2023-28646 (1)

Same Patch Batch · nextcloud · 2023-03-30 · 7 CVEs total

CVE-2023-26482 9.1 CRITICAL Scope of workflow operations is not validated in nextcloud server
CVE-2023-28644 5.7 MEDIUM Reference fetch can saturate the server bandwidth for 10 seconds in nextcloud server
CVE-2023-28643 5.5 MEDIUM Potential share collision for recipients when caching is enabled in nextcloud server
CVE-2023-28647 4.4 MEDIUM App pin of the iOS app can be bypassed in Nextcloud iOS
CVE-2023-28835 3.5 LOW Insecure randomness for default password in nextcloud
CVE-2023-28833 2.4 LOW Unrestricted filenames for logo or favicon as admin in the theming settings in nextcloud s

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-287

V. Comments for CVE-2023-28646

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