Vulnerability Monitor

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CVE-2021-32802

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`.

Published

2021-09-07T22:15:08.563

Last Modified

2024-11-21T06:07:46.450

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 9.3 (CRITICAL)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

  • Access Vector: NETWORK
  • Access Complexity: LOW
  • Authentication: NONE
  • Confidentiality Impact: COMPLETE
  • Integrity Impact: COMPLETE
  • Availability Impact: COMPLETE
Exploitability Score

10.0

Impact Score

10.0

Weaknesses
  • Type: Secondary
    CWE-829
  • Type: Primary
    CWE-829
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application nextcloud nextcloud_server < 20.0.12 Yes
Application nextcloud nextcloud_server < 21.0.4 Yes
Application nextcloud nextcloud_server < 22.1.0 Yes
References