Vulnerability identifier: #VU82073

Vulnerability risk: Medium

CVSSv3.1: 4.4 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-45660

CWE-ID: CWE-918

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Nextcloud Mail
Web applications / Modules and components for CMS

Vendor: Nextcloud

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 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 to perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Mail: 2.2.0 - 3.0.2

---

External links
http://github.com/nextcloud/mail/pull/8459
http://github.com/nextcloud/security-advisories/security/advisories/GHSA-8j9x-fmww-qr37
http://hackerone.com/reports/1895874

---

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.