CVE-2021-32688

 

Published at: - 12-07-2021 04:15

Last modified: - 26-10-2022 04:10

Total changes: - 7

Description

Nextcloud Server is a Nextcloud package that handles data storage. Nextcloud Server supports application specific tokens for authentication purposes. These tokens are supposed to be granted to a specific applications (e.g. DAV sync clients), and can also be configured by the user to not have any filesystem access. Due to a lacking permission check, the tokens were able to change their own permissions in versions prior to 19.0.13, 20.0.11, and 21.0.3. Thus fileystem limited tokens were able to grant themselves access to the filesystem. The issue is patched in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds aside from upgrading.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://hackerone.com/reports/1193321
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-48m7-7r2r-838r
• https://github.com/nextcloud/server/pull/27000
• FEDORA-2021-9b421b78af-Mailing List, Third Party Advisory
• FEDORA-2021-6f327296fe-Mailing List, Third Party Advisory
• GLSA-202208-17-Third Party Advisory

 

Keywords

NVD

 

CVE-2021-32688

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures