Multiple vulnerabilities in Nextcloud Server and Enterprise Server



Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2023-25162
CVE-2023-25161
CWE-ID CWE-918
CWE-284
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Nextcloud Server
Client/Desktop applications / Messaging software

Nextcloud Enterprise 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: #VU72490

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-25162

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. A remote attacker 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 Server: 23.0.0 - 24.0.7

Nextcloud Enterprise Server: 23.0.0 - 24.0.7

CPE2.3 External links

https://github.com/nextcloud/server/pull/34160
https://hackerone.com/reports/1702864
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-mqrx-grp7-244m


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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

2) Improper access control

EUVDB-ID: #VU72493

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-25161

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

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

The vulnerability exists due to improper access restrictions in the password reset functionality. A remote attacker can send lots of emails, leading to service slowdown, storage overflow and cost impact when using external email services.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nextcloud Server: 23.0.0 - 25.0.0

Nextcloud Enterprise Server: 23.0.0 - 25.0.0

CPE2.3 External links

https://github.com/nextcloud/server/pull/34632
https://hackerone.com/reports/1691195
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-492h-596q-xr2f


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker 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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