SB2024011907 - Multiple vulnerabilities in Nextcloud Guests

Description

This security bulletin contains information about 2 vulnerabilities.

1) Improper Handling of URL Encoding (Hex Encoding) (CVE-ID: CVE-2024-22402)

CWE-ID: CWE-177 - Improper Handling of URL Encoding (Hex Encoding)

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/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 improper handling of request URLs in Guests app. A remote user can load the pages of apps they are not allowed to access.

2) Improper Enforcement of Behavioral Workflow (CVE-ID: CVE-2024-22401)

CWE-ID: CWE-841 - Improper Enforcement of Behavioral Workflow

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

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

The vulnerability exists due to improper enforcement of behavioral workflow. A remote user can reset the allowed apps list for Guest App users.

Remediation

Install update from vendor's website.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-v3qw-7vgv-2fxj
• https://github.com/nextcloud/guests/pull/1082
• https://hackerone.com/reports/2251074
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-wr87-hx3w-29hh
• https://hackerone.com/reports/2250398