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
 

Recommended Reading:

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
COVID-19: Latest Security News & Commentary
Dark Reading Staff 8/14/2020
Lock-Pickers Face an Uncertain Future Online
Seth Rosenblatt, Contributing Writer,  8/10/2020
Hacking It as a CISO: Advice for Security Leadership
Kelly Sheridan, Staff Editor, Dark Reading,  8/10/2020
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
7 New Cybersecurity Vulnerabilities That Could Put Your Enterprise at Risk
In this Dark Reading Tech Digest, we look at the ways security researchers and ethical hackers find critical vulnerabilities and offer insights into how you can fix them before attackers can exploit them.
Flash Poll
The Changing Face of Threat Intelligence
The Changing Face of Threat Intelligence
This special report takes a look at how enterprises are using threat intelligence, as well as emerging best practices for integrating threat intel into security operations and incident response. Download it today!
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2020-17475
PUBLISHED: 2020-08-14
Lack of authentication in the network relays used in MEGVII Koala 2.9.1-c3s allows attackers to grant physical access to anyone by sending packet data to UDP port 5000.
CVE-2020-0255
PUBLISHED: 2020-08-14
** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: CVE-2020-10751. Reason: This candidate is a duplicate of CVE-2020-10751. Notes: All CVE users should reference CVE-2020-10751 instead of this candidate. All references and descriptions in this candidate have been removed to prevent accidenta...
CVE-2020-14353
PUBLISHED: 2020-08-14
** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: CVE-2017-18270. Reason: This candidate is a duplicate of CVE-2017-18270. Notes: All CVE users should reference CVE-2017-18270 instead of this candidate. All references and descriptions in this candidate have been removed to prevent accidenta...
CVE-2020-17464
PUBLISHED: 2020-08-14
** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Reason: This candidate was withdrawn by its CNA. Further investigation showed that it was not a security issue. Notes: none.
CVE-2020-17473
PUBLISHED: 2020-08-14
Lack of mutual authentication in ZKTeco FaceDepot 7B 1.0.213 and ZKBiosecurity Server 1.0.0_20190723 allows an attacker to obtain a long-lasting token by impersonating the server.