Multiple vulnerabilities in Nextcloud Server and Enterprise Server



Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2023-48306
CVE-2023-48304
CWE-ID CWE-918
CWE-639
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Nextcloud Enterprise Server
Client/Desktop applications / Messaging software

Nextcloud Server
Client/Desktop applications / Messaging software

Vendor Nextcloud

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Server-Side Request Forgery (SSRF)

EUVDB-ID: #VU83359

Risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-48306

CWE-ID: CWE-918 - Server-Side Request Forgery (SSRF)

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nextcloud Enterprise Server: 22.0.0 - 27.0.2

Nextcloud Server: 25.0.0 - 27.0.2

CPE2.3 External links

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8f69-f9jg-4x3v


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Authorization bypass through user-controlled key

EUVDB-ID: #VU83361

Risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-48304

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

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nextcloud Enterprise Server: 22.0.0 - 27.0.2

Nextcloud Server: 25.0.0 - 27.0.2

CPE2.3 External links

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8jwv-c8c8-9fr3


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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