Arbitrary file upload in Nextcloud Contacts



| Updated: 2020-11-27
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-8181
CWE-ID CWE-434
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Nextcloud Contacts
Web applications / CRM systems

Vendor Nextcloud

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Arbitrary file upload

EUVDB-ID: #VU48690

Risk: High

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-8181

CWE-ID: CWE-434 - Unrestricted Upload of File with Dangerous Type

Exploit availability: No

Description

The vulnerability allows a remote user to compromise vulnerable system.

The vulnerability exists due to insufficient validation of file during file upload. A remote user can upload a malicious avatar and execute it on the server.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nextcloud Contacts: 3.2.0

CPE2.3 External links

https://hackerone.com/reports/808287,
https://nextcloud.com/security/advisory/?id=NC-SA-2020-024


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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