Cisco issues a critical patch to address a remote code execution vulnerability in the Cisco WebEx software, hurry up apply it now!
Cisco has issued a critical patch to fix a serious vulnerability (CVE-2018-0112) in its WebEx software that could be exploited by remote attackers to execute arbitrary code on target machines via weaponized Flash files.
The vulnerability affects both client and server versions of WebEx Business Suite or WebEx Meetings. Cisco urges its users to update their software to fix the problem.
“A vulnerability in Cisco WebEx Business Suite clients, Cisco WebEx Meetings, and Cisco WebEx Meetings Server could allow an authenticated, remote attacker to execute arbitrary code on a targeted system.” reads the security advisory published by Cisco.
“The vulnerability is due to insufficient input validation by the Cisco WebEx clients. An attacker could exploit this vulnerability by providing meeting attendees with a malicious Flash (.swf) file via the file-sharing capabilities of the client. Exploitation of this vulnerability could allow arbitrary code execution on the system of a targeted user.”
The flaw has received a CVSS score of 9.0 and was rated as a ‘critical’ severity issue by Cisco.
The vulnerability was reported by the ENISA security expert Alexandros Zacharis of ENISA, it is due to insufficient input validation by the Cisco WebEx clients.
Zacharis discovered that an attacker could submit a malicious Flash file (.swf ) to a room full of attendees using the file sharing feature, then trigger the flaw to execute arbitrary code.
Cisco has already released software updates that fix the flaw, it confirmed that is not aware of any attacks exploiting the vulnerability in the wild.
Cisco added that currently there is no workaround to address the problem.
WebEx Business Suite software should be updated to the versions T32.10 and T31.23.2, while WebEx Meetings client software should be updated to T32.10 and Meetings Server should be updated to 2.8 MR2.
To determine whether a Cisco WebEx meeting application is running a flawed version of the WebEx client build, users can access their Cisco WebEx meeting site and go to the Support > Downloads section.
Pierluigi Paganini is member of the ENISA (European Union Agency for Network and Information Security) Threat Landscape Stakeholder Group and Cyber G7 Group, he is also a Security Evangelist, Security Analyst and Freelance Writer.
Editor-in-Chief at "Cyber Defense Magazine", Pierluigi is a cyber security expert with over 20 years experience in the field, he is Certified Ethical Hacker at EC Council in London. The passion for writing and a strong belief that security is founded on sharing and awareness led Pierluigi to find the security blog "Security Affairs" recently named a Top National Security Resource for US.
Pierluigi is a member of the "The Hacker News" team and he is a writer for some major publications in the field such as Cyber War Zone, ICTTF, Infosec Island, Infosec Institute, The Hacker News Magazine and for many other Security magazines.
Author of the Books "The Deep Dark Web" and “Digital Virtual Currency and Bitcoin”.