Permissions, Privileges, and Access Controls in Nextcloud Server - CVE-2021-32725
Published: July 12, 2021
Vulnerability identifier: #VU54671
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-32725
CWE-ID: CWE-264
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to escalate privileges on the system.
The vulnerability exists due to default share permissions are not respected for federated reshares of files and folders, which leads to security restrictions bypass and privilege escalation.
Affected software
Nextcloud Server
How to mitigate CVE-2021-32725
Install updates from vendor's website.
Nextcloud Server - addressed in versions 19.0.13, 20.0.11, 21.0.3