Remote command execution in Cisco Webex Teams

Published: 2019-09-05

Risk	High
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2019-1939
CWE-ID	CWE-78
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Cisco Webex Teams Client/Desktop applications / Office applications
Vendor	Cisco Systems, Inc

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) OS command injection

EUVDB-ID: #VU20873

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-1939

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary commands on the target system.

The vulnerability exists due to improper restrictions on software logging features used by the application on Windows operating systems. A remote attacker can trick a victim to visit a website designed to submit malicious input to the affected application, cause the application to modify files and execute arbitrary commands on the system with the privileges of the current user.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco Webex Teams: 2.0.4167 - 3.0.11110.0

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190904-webex-teams

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.