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.

Application Security

8/11/2020
03:20 PM
50%
50%

Zoom Vulnerabilities Demonstrated in DEF CON Talk

A security researcher demonstrated multiple vulnerabilities, two of which could let an attacker read and steal user data.

Zoom has patched multiple vulnerabilities discovered by a security researcher who presented his findings in a DEF CON 28 talk. 

Security researcher Mazin Ahmed discovered vulnerabilities affecting Zoom's production and development infrastructure, the Zoom Linux app, and Zoom's implementation of end-to-end encryption. Ahmed first discovered a memory leak vulnerability affecting an API belonging to Zoom production infrastructure and reported it to the company in April.

Following this, he discovered more vulnerabilities, which were reported with additional follow-up in July. Zoom acknowledged receipt and provided a conclusive response; some of the issues were patched in Zoom version 5.2.4, which was released on Aug. 3.

In a write-up, Ahmed explained the flaws he found and how Zoom responded. One of the flaws was in the Zoom Launcher implementation. Attackers could exploit Zoom Launcher for Linux to run their own software, which he says "breaks all of the protection of application whitelisting" and could let malware run as a subprocess of Zoom

Attackers would need to compromise a machine by other means to exploit this, Zoom says, and the vulnerability would only work if they were running the Linux OS and using Zoom for the first time. A patch was issued in version 5.2.0 on Aug. 2.

In another issue affecting Linux, Ahmed found the Zoom local database implementation allows Zoom to store custom configurations and user data. Assuming there is already access to a user's machine, anyone could read and exfiltrate Zoom user data and configuration, he explains. The user would also have to be running Linux. Zoom also patched this vulnerability in version 5.2.0.

Zoom has reached out to provide the following statement: "We thank Mazin for reporting his findings. We have fixed all relevant issues and recommend that users keep their Zoom clients up to date to ensure they receive ongoing security and product updates. Zoom appreciates vulnerability reports from researchers." Those who think they've discovered a Zoom security issue are encouraged to send a detailed report to [email protected]."

Read Ahmed's full blog post for more details.

Dark Reading's Quick Hits delivers a brief synopsis and summary of the significance of breaking news events. For more information from the original source of the news item, please follow the link provided in this article. View Full Bio
 

Recommended Reading:

Comment  | 
Print  | 
More Insights
Comments
Threaded  |  Newest First  |  Oldest First
COVID-19: Latest Security News & Commentary
Dark Reading Staff 10/27/2020
Modern Day Insider Threat: Network Bugs That Are Stealing Your Data
David Pearson, Principal Threat Researcher,  10/21/2020
Are You One COVID-19 Test Away From a Cybersecurity Disaster?
Alan Brill, Senior Managing Director, Cyber Risk Practice, Kroll,  10/21/2020
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
Special Report: Computing's New Normal
This special report examines how IT security organizations have adapted to the "new normal" of computing and what the long-term effects will be. Read it and get a unique set of perspectives on issues ranging from new threats & vulnerabilities as a result of remote working to how enterprise security strategy will be affected long term.
Flash Poll
How IT Security Organizations are Attacking the Cybersecurity Problem
How IT Security Organizations are Attacking the Cybersecurity Problem
The COVID-19 pandemic turned the world -- and enterprise computing -- on end. Here's a look at how cybersecurity teams are retrenching their defense strategies, rebuilding their teams, and selecting new technologies to stop the oncoming rise of online attacks.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2020-27956
PUBLISHED: 2020-10-28
An Arbitrary File Upload in the Upload Image component in SourceCodester Car Rental Management System 1.0 allows the user to conduct remote code execution via admin/index.php?page=manage_car because .php files can be uploaded to admin/assets/uploads/ (under the web root).
CVE-2020-27957
PUBLISHED: 2020-10-28
The RandomGameUnit extension for MediaWiki through 1.35 was not properly escaping various title-related data. When certain varieties of games were created within MediaWiki, their names or titles could be manipulated to generate stored XSS within the RandomGameUnit extension.
CVE-2020-16140
PUBLISHED: 2020-10-27
The search functionality of the Greenmart theme 2.4.2 for WordPress is vulnerable to XSS.
CVE-2020-9982
PUBLISHED: 2020-10-27
This issue was addressed with improved checks to prevent unauthorized actions. This issue is fixed in Apple Music 3.4.0 for Android. A malicious application may be able to leak a user's credentials.
CVE-2020-3855
PUBLISHED: 2020-10-27
An access issue was addressed with improved access restrictions. This issue is fixed in macOS Catalina 10.15.3, Security Update 2020-001 Mojave, Security Update 2020-001 High Sierra. A malicious application may be able to overwrite arbitrary files.