#VU71815 Unprotected storage of credentials in Nextcloud Mail - CVE-2023-23944

Vulnerability identifier: #VU71815

Vulnerability risk: Low

CVSSv4.0: 0.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-23944

CWE-ID: CWE-256

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Nextcloud Mail
Web applications / Modules and components for CMS

Vendor: Nextcloud

Description

The vulnerability allows a local user to gain access to other users' credentials.

The vulnerability exists due to application stored credentials in plain text in a configuration file on the system during the duration of OAuth2 setup procedure. A local administrator can view contents of the configuration file and gain access to passwords for 3rd party integration.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Mail: before 2.2.2

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External links
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-g86r-x755-93f4

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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