Cisco Webex bug allowed anyone to join a password-protected meeting

Patched vuln was 'in active use', firm reveals


Cisco has confessed to a vulnerability in its Webex Meetings Suite sites and Webex Meetings Online sites that allowed an "unauthenticated" attendee sitting on a workstation far, far away to join a "password-protected meeting without providing the meeting password".

According to the security advisory, which was rated as "High": "The vulnerability is due to unintended meeting information exposure in a specific meeting join flow for mobile applications."

This is where the user goes to the meeting link in a browser – for which the meeting ID is needed. The browser then launches the Webex app, and it is within this flow that the vulnerability could be exploited.

They wouldn't have snuck in unnoticed, however.

"A successful exploit could allow the unauthorized attendee to join the password-protected meeting. The unauthorized attendee will be visible in the attendee list of the meeting as a mobile attendee," said Cisco.

Vulnerable products include Cisco's Webex Meetings Suite and Webex Meetings Online site releases earlier than 39.11.5 and 40.1.3. The on-premises Cisco Webex Meetings Server (which incidentally will be end of life in July) is not affected.

There are no workarounds, Cisco said, but the bug has been fixed and users will not need to update their mobile or desktop Webex applications.

The vulnerability was discovered as a result of a support case, and according to the advisory, although there was no previous public disclosure: "Cisco PSIRT [Product security Incident Response Team] is aware of active use of the vulnerability that is described in this advisory."

As vulnerabilities go, it could be worse. Having said that, unauthorised attendance at an online meeting could have consequences, such as employees learning management secrets, industrial espionage, insider trading, or worse.

Cisco also released a batch of security updates earlier this month – including one for Webex Video Mesh. ®


Keep Reading

Tech Resources

The State of Application Security 2020

Forrester analyzed the state of application security in 2020 and found over 75% of external attacks are attributed to web application and software exploits.

How backup modernization changes the ransomware game

If the thrill of backing up your data and wondering if you will ever see it again has worn off, start the new year by getting rid of the lingering pain of legacy backup. Bipul Sinha, CEO of the Cloud Data Management Company, Rubrik, and Miguel Zatarain, Director of Global Infrastructure Technology at PACCAR, Fortune 500 manufacturer of trucks and Rubrik customer, are talking to the Reg’s Tim Phillips about how to eliminate the costly, slow and spotty performance of legacy backup, and how to modernize your implementation in 2021 to make your business more resilient.

Webcast Slide Deck | Three reasons you need a hybrid multicloud

Businesses need their IT teams to operate applications and data in a hybrid environment spanning on-premises private and public clouds. But this poses many challenges, such as managing complex networking, re-architecting applications for the cloud, and managing multiple infrastructure silos. There is a pressing need for a single platform that addresses these challenges - a hybrid multicloud built for the digital innovation era. Just this Regcast to find out: Why hybrid multicloud is the ideal path to accelerate cloud migration.

Anatomy of a Private Cloud

Learn the key elements that combined, build a true Private Cloud

Biting the hand that feeds IT © 1998–2021