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CVE-2024-22402— Improper handling of request URLs in Nextcloud Guests app allows guest users to bypass app allowlist

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 存在安全漏洞，该漏洞源于对请求URL处理不当，导致用户可以加载不被允许的应用程序页面。受影响的产品和版本：Nextcloud guests 2.4.0及更高版本，2.5.0及更高版本，3.0.0及更高版本。

CVSS 5.4 · Medium EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1078.001 · Default Accounts
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I. Basic Information for CVE-2024-22402

Vulnerability Information
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Vulnerability Title
Improper handling of request URLs in Nextcloud Guests app allows guest users to bypass app allowlist
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud guests app is a utility to create guest users which can only see files shared with them. In affected versions users were able to load the first page of apps they were actually not allowed to access. Depending on the selection of apps installed this may present a permissions bypass. It is recommended that the Guests app is upgraded to 2.4.1, 2.5.1 or 3.0.1. There are no known workarounds for this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
权限预留不恰当
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 存在安全漏洞，该漏洞源于对请求URL处理不当，导致用户可以加载不被允许的应用程序页面。受影响的产品和版本：Nextcloud guests 2.4.0及更高版本，2.5.0及更高版本，3.0.0及更高版本。
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 >= 2.4.0, < 2.4.1 -

II. Public POCs for CVE-2024-22402

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III. Intelligence Information for CVE-2024-22402

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Patches & Fixes for CVE-2024-22402 (1)

Vendor Advisories for CVE-2024-22402 (1)

Other References for CVE-2024-22402 (1)

Same Patch Batch · nextcloud · 2024-01-18 · 7 CVEs total

CVE-2024-22212 9.7 CRITICAL Nextcloud global site selector authentication bypass
CVE-2024-22401 4.1 MEDIUM All users can reset the allowed apps list for Nextcloud Guest App users
CVE-2024-22404 4.1 MEDIUM Permissions bypass in Nextcloud with the files zip app
CVE-2024-22400 3.1 LOW Open redirect in user_saml via RelayState parameter in Nextcloud User Saml
CVE-2024-22403 3.0 LOW OAuth2 authorization codes are valid indefinetly in Nextcloud server
CVE-2024-22213 Cross-site Scripting when sending HTML as a comment in the Nextcloud Deck app

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-281

V. Comments for CVE-2024-22402

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