CVE-2021-32802

 

Published at: - 08-09-2021 12:15

Last modified: - 27-09-2022 04:16

Total changes: - 7

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`.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

 

Verification logic

 

Reference

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m682-v4g9-wrq7
• https://docs.nextcloud.com/server/21/admin_manual/configuration_files/previews_configuration.html#disabling-previews
• https://hackerone.com/reports/1261413
• GLSA-202208-17-Third Party Advisory

 

Keywords

NVD

 

CVE-2021-32802

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures