#VU82073 Server-Side Request Forgery (SSRF) in Nextcloud Mail - CVE-2023-45660

Vulnerability identifier: #VU82073

Vulnerability risk: Medium

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

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

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

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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.