Information disclosure in Zoom client for Windows

1) Reliance on Untrusted Inputs in a Security Decision

EUVDB-ID: #VU26523

Risk: Medium

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: N/A

CWE-ID: CWE-807 - Reliance on Untrusted Inputs in a Security Decision

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to Zoom client for Windows automatically processes comments in chat and converts URLs with UNC path into links. A remote attacker can trick the victim into following this link and gain access to NTLM credentials, sent by the victim's system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Zoom Workplace Desktop App for Windows: 0.9.10042.0911 - 4.6.8 19178.0323

CPE2.3

• cpe:2.3:a:zoom_video_communications:zoom_client_for_windows:0.9.10042.0911:*:*:*:*:*:*:*
• cpe:2.3:a:zoom_video_communications:zoom_client_for_windows:0.9.10894.0925:*:*:*:*:*:*:*
• cpe:2.3:a:zoom_video_communications:zoom_client_for_windows:0.92.12362.1030:*:*:*:*:*:*:*

External links

https://www.bleepingcomputer.com/news/security/zoom-client-leaks-windows-login-credentials-to-attackers/
https://support.zoom.us/hc/en-us/articles/201361953-New-Updates-for-Windows

Q & A

Can this vulnerability be exploited remotely?

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

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.

Is there known malware, which exploits this vulnerability?

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