CRLF injection in Nextcloud Enterprise Server



Published: 2022-07-18
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2022-31014
CWE-ID CWE-93
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Nextcloud Enterprise Server
Client/Desktop applications / Messaging software

Vendor Nextcloud

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) CRLF injection

EUVDB-ID: #VU65375

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 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

Exploit availability: No

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 update from vendor's website.

Vulnerable software versions

Nextcloud Enterprise Server: before 23.0.5

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


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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