Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Vulnerabilities / Threats

10/1/2019
05:10 PM
Connect Directly
Twitter
LinkedIn
Google+
RSS
E-Mail
50%
50%

Cisco Webex & Zoom Bug Lets Attackers Spy on Conference Calls

The "Prying-Eye" vulnerability could let intruders scan for unprotected meeting IDs and snoop on conference calls.

Researchers have discovered a vulnerability in the Zoom and Cisco Webex conference platforms that could let an attacker scan for and drop into video meetings unprotected with a password.

The "Prying-Eye" vulnerability was discovered in July by researchers with the CQ Prime Threat Research Team, a division of application security startup Cequence. Cisco and Zoom were immediately notified of the flaw, and both companies have issued patches for their systems.

An adversary could exploit Prying-Eye to launch an enumeration attack, which leverages automation to detect numeric or alphanumeric sequences that are used as identifiers for public-facing applications. CQ Prime analysts targeted the web conferencing APIs with a bot designed to scan and discover valid numeric meeting IDs for Webex and Zoom calls. If the meeting isn't protected with a password or other authentication, the attacker could drop in.

When the bot cycles through the sequences to find a valid ID, it comes back and determines whether the ID is valid and whether it requires a password, says Shreyans Mehta, co-founder and CTO of Cequence and leader of this research. An attacker could respond back and view or listen to an active meeting, and could also use this tactic to determine the IDs of future calls.

That's not all the attacker could discover, Mehta points out. "Once you identify an unprotected meeting ID, you can get more information about that meeting host and you can get information about who owns the meeting identifier," he explains. Depending on the target, the attacker could gain access to the meeting host's name or email address in addition to information about the meeting.

It is worth noting the intruder may be noticed, as callers are announced when they join meetings. There is no indication this vulnerability has been exploited on either Webex or Zoom platforms.

When Cisco learned an attacker could abuse Webex API calls to enumerate meeting numbers, it created a fix and issued an advisory to warn users of the bug. It advises admins keep the default configuration, which requires the use of a password when a meeting is created. Webex offers a randomly generated password by default in the meeting setup process for sites that don't mandate password protection; however, users can replace this password with their own or disable password protection if the site allows.

Zoom is releasing new controls for its meeting and webinar password settings. Before today's update, users could enable passwords on a meeting-by-meeting basis; this change adds new settings at the account, group, and user level. Passwords can now be required for scheduling new meetings, setting up instant meetings, and for personal meeting ID (PMI). The additional settings are meant to give account owners and admins more control over meeting passwords.

New password settings were enabled by default for accounts without Zoom Rooms on September 29. They will be enabled by default for accounts with Zoom Rooms on November 23. This change will not affect users who join calls by clicking a meeting link or through desktop calendar integration.

The idea behind this research was not only to highlight the vulnerability in Cisco and Webex but to draw attention to the danger of enumeration attacks and how they can target APIs, says Mehta. Many of the applications in use today tie web forms or mobile devices to back-end systems. In addition to unauthorized access, an enumeration attack could be used as an application distributed denial-of-service attack and cycle ongoing requests until the application shuts down, driving up infrastructure cost.

Related Content:

Check out The Edge, Dark Reading's new section for features, threat data, and in-depth perspectives. Today's top story: "5 Disruptive Trends Transforming Cybersecurity."

Kelly Sheridan is the Staff Editor at Dark Reading, where she focuses on cybersecurity news and analysis. She is a business technology journalist who previously reported for InformationWeek, where she covered Microsoft, and Insurance & Technology, where she covered financial ... View Full Bio

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
HackerOne Drops Mobile Voting App Vendor Voatz
Dark Reading Staff 3/30/2020
Limited-Time Free Offers to Secure the Enterprise Amid COVID-19
Curtis Franklin Jr., Senior Editor at Dark Reading,  3/31/2020
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Current Issue
6 Emerging Cyber Threats That Enterprises Face in 2020
This Tech Digest gives an in-depth look at six emerging cyber threats that enterprises could face in 2020. Download your copy today!
Flash Poll
State of Cybersecurity Incident Response
State of Cybersecurity Incident Response
Data breaches and regulations have forced organizations to pay closer attention to the security incident response function. However, security leaders may be overestimating their ability to detect and respond to security incidents. Read this report to find out more.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2020-8142
PUBLISHED: 2020-04-03
A security restriction bypass vulnerability has been discovered in Revive Adserver version < 5.0.5 by HackerOne user hoangn144. Revive Adserver, like many other applications, requires the logged in user to type the current password in order to change the e-mail address or the password. It was how...
CVE-2020-8143
PUBLISHED: 2020-04-03
An Open Redirect vulnerability was discovered in Revive Adserver version < 5.0.5 and reported by HackerOne user hoangn144. A remote attacker could trick logged-in users to open a specifically crafted link and have them redirected to any destination.The CSRF protection of the “/...
CVE-2020-8147
PUBLISHED: 2020-04-03
Flaw in input validation in npm package utils-extend version 1.0.8 and earlier may allow prototype pollution attack that may result in remote code execution or denial of service of applications using utils-extend.
CVE-2020-6994
PUBLISHED: 2020-04-03
A buffer overflow vulnerability was found in some devices of Hirschmann Automation and Control HiOS and HiSecOS. The vulnerability is due to improper parsing of URL arguments. An attacker could exploit this vulnerability by specially crafting HTTP requests to overflow an internal buffer. The followi...
CVE-2020-8637
PUBLISHED: 2020-04-03
A SQL injection vulnerability in TestLink 1.9.20 allows attackers to execute arbitrary SQL commands in dragdroptreenodes.php via the node_id parameter.