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CVE-2021-32734— File path disclosure of shared files in Nextcloud Text 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 Server在19.0.13、20.011和21.0.3之前的版本中存在信息泄露漏洞，该漏洞可能导致共享文件的完整路径公开。

CVSS 3.1 · Low EPSS 1.38% · P71

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2021-32734

Vulnerability Information
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Vulnerability Title
File path disclosure of shared files in Nextcloud Text application
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, the Nextcloud Text application shipped with Nextcloud Server returned verbatim exception messages to the user. This could result in a full path disclosure on shared files. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. As a workaround, one may disable the Nextcloud Text application in Nextcloud Server app settings.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过错误消息导致的信息暴露
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 Server在19.0.13、20.011和21.0.3之前的版本中存在信息泄露漏洞，该漏洞可能导致共享文件的完整路径公开。
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 < 19.0.13 -

II. Public POCs for CVE-2021-32734

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III. Intelligence Information for CVE-2021-32734

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Patches & Fixes for CVE-2021-32734 (1)

Vendor Advisories for CVE-2021-32734 (2)

Other References for CVE-2021-32734 (1)

Same Patch Batch · nextcloud · 2021-07-12 · 14 CVEs total

CVE-2021-32688 8.8 HIGH Application specific tokens can change their own scope
CVE-2021-32689 8.1 HIGH Nextcloud Talk not properly disassociating users from chats after account deletion
CVE-2021-32726 7.1 HIGH Webauthn tokens not removed after user has been deleted
CVE-2021-32727 5.7 MEDIUM End-to-end encryption device setup did not verify public key
CVE-2021-32741 5.3 MEDIUM Lack of ratelimit on public share link mount endpoint
CVE-2021-32705 5.3 MEDIUM Lack of ratelimit on public DAV endpoint
CVE-2021-32703 5.3 MEDIUM Lack of ratelimit on shareinfo endpoint
CVE-2021-32733 4.8 MEDIUM XSS in Nextcloud Text application
CVE-2021-32707 4.3 MEDIUM Bypass of image blocking in Nextcloud Mail
CVE-2021-32678 3.7 LOW Ratelimit not applied on OCS API responses
CVE-2021-32725 3.5 LOW Default share permissions not respected for federated reshares
CVE-2021-32679 3.5 LOW Filenames not escaped by default in controllers using DownloadResponse
CVE-2021-32680 3.3 LOW Audit log is not properly logging unsetting of share expiration date

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-209

V. Comments for CVE-2021-32734

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