Vulnerability identifier: #VU65375

Vulnerability risk: Low

CVSSv3.1: 3.6 [CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-31014

CWE-ID: CWE-93

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Nextcloud Server
Client/Desktop applications / Messaging software

Vendor: Nextcloud

Description

The vulnerability allows a remote attacker to inject arbitrary data in server response.

The vulnerability exists due to insufficient validation of attacker-supplied data in iCalendar Attachments to emails via newlines. A remote user can pass specially crafted data to the application containing CR-LF characters and modify application behavior.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Server: 22.2.0 - 24.0.0

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External links
http://github.com/nextcloud/security-advisories/security/advisories/GHSA-264h-3v4w-6xh2
http://hackerone.com/reports/1516377
http://github.com/nextcloud/server/pull/32428

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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.