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CVE-2023-28645— Secure view can be bypassed by using internal API endpoint in Nextcloud richdocuments

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 richdocuments存在访问控制错误漏洞。攻击者利用该漏洞绕过安全查看功能。

CVSS 5.7 · Medium EPSS 0.74% · P53

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-28645

Vulnerability Information
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Vulnerability Title
Secure view can be bypassed by using internal API endpoint in Nextcloud richdocuments
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud richdocuments is a Nextcloud app integrating the office suit Collabora Online. In affected versions the secure view feature of the rich documents app can be bypassed by using unprotected internal API endpoint of the rich documents app. It is recommended that the Nextcloud Office app (richdocuments) is upgraded to 8.0.0-beta.1, 7.0.2 or 6.3.2. Users unable to upgrade may mitigate the issue by taking steps to restrict the ability to download documents. This includes ensuring that the `WOPI configuration` is configured to only serve documents between Nextcloud and Collabora. It is highly recommended to define the list of Collabora server IPs as the allow list within the Office admin settings of Nextcloud.
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 访问控制错误漏洞
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 richdocuments存在访问控制错误漏洞。攻击者利用该漏洞绕过安全查看功能。
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 >= 7.0.0, < 7.0.2 -

II. Public POCs for CVE-2023-28645

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III. Intelligence Information for CVE-2023-28645

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Patches & Fixes for CVE-2023-28645 (1)

Vendor Advisories for CVE-2023-28645 (1)

Other References for CVE-2023-28645 (1)

Same Patch Batch · nextcloud · 2023-03-31 · 3 CVEs total

CVE-2023-28844 5.7 MEDIUM User without download rights can download older version of that file in nextcloud server
CVE-2023-28845 3.5 LOW Chat room membership disclosed via autocompletion in Nextcloud talk

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-284

V. Comments for CVE-2023-28645

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