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CVE-2021-39224— File path disclosure of shared files in OfficeOnline application

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存在信息泄露漏洞，该漏洞源于网络系统或产品的运行过程中信息的非正常输出。

CVSS 3.5 · Low EPSS 0.88% · P58

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery
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I. Basic Information for CVE-2021-39224

Vulnerability Information
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Vulnerability Title
File path disclosure of shared files in OfficeOnline application
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud OfficeOnline application prior to version 1.1.1 returned verbatim exception messages to the user. This could result in a full path disclosure on shared files. (e.g. an attacker could see that the file `shared.txt` is located within `/files/$username/Myfolder/Mysubfolder/shared.txt`). It is recommended that the OfficeOnline application is upgraded to 1.1.1. As a workaround, one may disable the OfficeOnline application in the app settings.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 信息泄露漏洞
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存在信息泄露漏洞，该漏洞源于网络系统或产品的运行过程中信息的非正常输出。
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 < 1.1.1 -

II. Public POCs for CVE-2021-39224

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III. Intelligence Information for CVE-2021-39224

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Patches & Fixes for CVE-2021-39224 (1)

Vendor Advisories for CVE-2021-39224 (1)

Same Patch Batch · nextcloud · 2021-10-25 · 8 CVEs total

CVE-2021-41178 8.8 HIGH File Traversal affecting SVG files on Nextcloud Server
CVE-2021-39225 8.1 HIGH Missing permission check on Deck API
CVE-2021-41177 8.1 HIGH Rate-limits not working on instances without configured memory cache backend
CVE-2021-41179 6.5 MEDIUM Two-Factor Authentication not enforced for pages marked as public
CVE-2021-39221 6.4 MEDIUM XSS in Contacts
CVE-2021-39223 4.8 MEDIUM File path disclosure of shared files in Richdocuments application
CVE-2021-39220 3.5 LOW Bypass of image blocking in Nextcloud Mail

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-200

V. Comments for CVE-2021-39224

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