Remote Code Execution in Cisco WebEx Browser Extension

1) Improper input validation

EUVDB-ID: #VU7551

Risk: High

CVSSv3.1: 8.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-6753

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to an unknown error. A remote attacker can create a specially crafted web page, trick the victim into opening it and execute arbitrary code on the target system with privileges of the current user.

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

Mitigation

Update your browser extension to version 1.0.12 for Mozilla Firefox and Google Chrome.

Vulnerable software versions

Cisco WebEx Browser Extension: 1.0.1 - 1.0.11

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170717-webex

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.