Backdoor in 3CX Electron desktop app for Windows and Mac

1) Embedded malicious code (backdoor)

EUVDB-ID: #VU74216

Risk: Critical

CVSSv3.1: 9.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2023-29059

CWE-ID: CWE-506 - Embedded Malicious Code

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain unauthorized access to the application.

The vulnerability exists due to presence of embedded malicious functionality in the application code (aka backdoor) that allows a remote attacker to gain unauthorized access to the application.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Electron Mac App: 18.11.1213 - 18.12.416

Electron Windows App: 18.12.407 - 18.12.416

External links

http://www.3cx.com/blog/news/desktopapp-security-alert/
http://www.sentinelone.com/blog/smoothoperator-ongoing-campaign-trojanizes-3cx-software-in-software-supply-chain-attack/
http://www.crowdstrike.com/blog/crowdstrike-detects-and-prevents-active-intrusion-campaign-targeting-3cxdesktopapp-customers/
http://success.trendmicro.com/dcx/s/solution/000292711?language=en_US

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?

Yes. This vulnerability is being exploited in the wild.