Vulnerability identifier: #VU17205

Vulnerability risk: High

CVSSv3.1: 8.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-1636

CWE-ID: CWE-427

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Cisco Webex Teams
Client/Desktop applications / Office applications

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insecure .dll loading mechanism when opening files. A remote attacker can place a file along with specially crafted .dll file on a remote SBM or WebDAV share, trick the victim into opening it and execute arbitrary code on the target system with privileges of the current victim.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation
Update to version 3.0.10260.0.

Vulnerable software versions

Cisco Webex Teams: 3.0.4533

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190123-webex-teams

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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?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.