SB2023010907 - Multiple vulnerabilities in Nextcloud Deck

Description

This security bulletin contains information about 3 vulnerabilities.

1) Authorization bypass through user-controlled key (CVE-ID: CVE-2023-22471)

CWE-ID: CWE-639 - Authorization Bypass Through User-Controlled Key

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

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to authorization bypass through user-controlled key. A remote user can delete attachments of other users.

2) Resource exhaustion (CVE-ID: CVE-2023-22470)

CWE-ID: CWE-400 - Resource exhaustion

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

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources. A remote user can trigger resource exhaustion and perform a denial of service (DoS) attack.

3) Information disclosure (CVE-ID: CVE-2023-22469)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

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

The vulnerability allows a remote user to gain access to potentially sensitive information.

The vulnerability exists due to deck card reference caching can leak data to unauthorized users.

Remediation

Install update from vendor's website.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2vw5-pfg6-3wm6
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-93j5-wx4c-6g88
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8fjp-w9gp-j5hq