SB2022080526 - Input validation error in Nextcloud Server

Description

This security bulletin contains information about 1 vulnerability.

1) Input validation error (CVE-ID: CVE-2022-31120)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote administrator on the local network to compromise the target system.

The vulnerability exists due to dederated share accepting/declining is not logged in audit log, leading to brute force attacks to go unnoticed

Remediation

Install update from vendor's website.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-9qvg-7fwg-722x
• https://github.com/nextcloud/server/pull/31594/commits/1d8bf9a89c6856218802a1d365000a5831be8655
• https://portal.nextcloud.com/article/using-the-audit-log-44.html