DLL injection in Zoom clients for Windows

1) Insecure DLL loading

EUVDB-ID: #VU69355

Risk: Low

CVSSv3.1: 5.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-28766

CWE-ID: CWE-427 - Uncontrolled Search Path Element

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to the application loads DLL libraries in an insecure manner. A local user can force the application to load a malicious .dll file and execute arbitrary code on the system in the context of the Zoom client.

Note, the vulnerability affects only Windows 32-bit clients.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Zoom Client for Windows: 5.0.0 23168.0427 - 5.12.3 9638

Virtual Desktop Infrastructure (VDI): 5.0.1 - 5.12.3

Zoom Rooms for Windows: 5.0.0 1420.0426 - 5.12.2 1970

External links

http://explore.zoom.us/en/trust/security/security-bulletin/#ZSB-22027

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.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open a file.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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