SB2023121925 - Multiple vulnerabilities in Nextcloud Server and Enterprise Server

Description

This security bulletin contains information about 2 vulnerabilities.

1) Improper access control (CVE-ID: CVE-2023-49791)

CWE-ID: CWE-284 - Improper Access Control

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

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to workflows do not require password confirmation on API level. A remote user can bypass implemented security restrictions and delete and modify workflows.

2) Improper Restriction of Excessive Authentication Attempts (CVE-ID: CVE-2023-49792)

CWE-ID: CWE-307 - Improper Restriction of Excessive Authentication Attempts

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

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to improper restriction of excessive authentication attempts with misconfigured proxy. A remote attacker can perform a brute-force attack on the system.

Remediation

Install update from vendor's website.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-3f8p-6qww-2prr
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5j2p-q736-hw98