SB2023112137 - Multiple vulnerabilities in Nextcloud Server and Enterprise Server

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Server-Side Request Forgery (SSRF) (CVE-ID: CVE-2023-48306)

The disclosed vulnerability allows a remote attacker to perform SSRF attacks.

The vulnerability exists due to insufficient validation of user-supplied input in DNS pin middleware. A remote user can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.

Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.

2) Authorization bypass through user-controlled key (CVE-ID: CVE-2023-48304)

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to the authorization bypass through user-controlled key. A remote user can enable and disable the birthday calendar for any user on the same server.

Remediation

Install update from vendor's website.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8f69-f9jg-4x3v
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8jwv-c8c8-9fr3