Information disclosure in Nextcloud Android Talk

1) Authentication bypass using an alternate path or channel

EUVDB-ID: #VU61279

Risk: Low

CVSSv4.0: 0.4 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-41181

CWE-ID: CWE-288 - Authentication Bypass Using an Alternate Path or Channel

Exploit availability: No

Description

The vulnerability allows a local attacker to gain access to potentially sensitive information.

The vulnerability exists due to the affected application does not properly detect the lockscreen state when a call is incoming. An attacker with physical access to the locked phone can gain access to the chat messages and files of the user.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nextcloud Android Talk: All versions

CPE2.3

• cpe:2.3:a:nextcloud:nextcloud_android_talk:*:*:*:*:*:*:*:*

External links

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-497c-c8hx-6qcf
https://github.com/nextcloud/talk-android/pull/1585

Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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