#VU69629 Improper access control in Nextcloud Android Talk - CVE-2022-41926

Vulnerability identifier: #VU69629

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-41926

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Nextcloud Android Talk
Client/Desktop applications / Messaging software

Vendor: Nextcloud

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in the broadcast receiver. A remote attacker can bypass implemented security restrictions and cause interference on starting a call or requesting media permissions.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Android Talk: before 14.1.0

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External links
https://hackerone.com/reports/1596459
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-564v-3rfc-352m
https://github.com/nextcloud/talk-android/pull/2148

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.