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CVE-2021-32802— Preview generation used third-party library not suited for user-generated content in Nextcloud server

CVSS 9.3 · Critical EPSS 2.25% · P85
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I. Basic Information for CVE-2021-32802

Vulnerability Information
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Vulnerability Title
Preview generation used third-party library not suited for user-generated content in Nextcloud server
Source: NVD (National Vulnerability Database)
Vulnerability Description
Nextcloud server is an open source, self hosted personal cloud. Nextcloud supports rendering image previews for user provided file content. For some image types, the Nextcloud server was invoking a third-party library that wasn't suited for untrusted user-supplied content. There are several security concerns with passing user-generated content to this library, such as Server-Side-Request-Forgery, file disclosure or potentially executing code on the system. The risk depends on your system configuration and the installed library version. It is recommended that the Nextcloud Server is upgraded to 20.0.12, 21.0.4 or 22.1.0. These versions do not use this library anymore. As a workaround users may disable previews by setting `enable_previews` to `false` in `config.php`.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
从非可信控制范围包含功能例程
Source: NVD (National Vulnerability Database)
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Nextcloud 服务器调用了不可信内容的第三方库。
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

VendorProductAffected VersionsCPESubscribe
nextcloudsecurity-advisories < 20.0.12 -

II. Public POCs for CVE-2021-32802

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III. Intelligence Information for CVE-2021-32802

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Same Patch Batch · nextcloud · 2021-09-07 · 9 CVEs total

CVE-2021-328008.1 HIGHBypass of Two Factor Authentication in Nextcloud server
CVE-2021-376287.5 HIGHFile Drop can be bypassed using Richdocuments app in nextcloud
CVE-2021-376306.5 MEDIUMSecret Circle can be joined without approval in Nextcloud Circles
CVE-2021-376316.5 MEDIUMCircle can be accessed by non-Circle members in Nextcloud Deck
CVE-2021-327825.8 MEDIUMCross-Site Scripting in Nextcloud Circles
CVE-2021-328015.5 MEDIUMExceptions may have logged Encryption-at-Rest key content in Nextcloud server
CVE-2021-327665.3 MEDIUMNextcloud Text app can disclose existence of folders in "File Drop" link share
CVE-2021-376295.3 MEDIUMLack of ratelimit on Richdocuments OCS endpoint in nextcloud

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-829

V. Comments for CVE-2021-32802

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