← Back to CVEs

CVE-2021-32802

CRITICAL

9.3

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`.

CVE Details

CVSS v3.1 Score9.3

SeverityCRITICAL

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published9/7/2021

Last Modified11/21/2024

Sourcenvd

Honeypot Sightings0

Affected Products

nextcloud:nextcloud_server

Weaknesses (CWE)

CWE-829CWE-829

References

https://docs.nextcloud.com/server/21/admin_manual/configuration_files/previews_configuration.html#disabling-previews(security-advisories@github.com)

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m682-v4g9-wrq7(security-advisories@github.com)

https://hackerone.com/reports/1261413(security-advisories@github.com)

https://security.gentoo.org/glsa/202208-17(security-advisories@github.com)

https://docs.nextcloud.com/server/21/admin_manual/configuration_files/previews_configuration.html#disabling-previews(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-m682-v4g9-wrq7(af854a3a-2127-422b-91ae-364da2661108)

https://hackerone.com/reports/1261413(af854a3a-2127-422b-91ae-364da2661108)

https://security.gentoo.org/glsa/202208-17(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.