Security Experts:

Connect with us

Hi, what are you looking for?


Endpoint Security

Zoom Patches Serious macOS App Vulnerabilities Disclosed at DEF CON

Zoom informed customers last week that macOS updates for the Zoom application patch two high-severity vulnerabilities. Details of the flaws were disclosed on Friday at the DEF CON conference in Las Vegas by macOS security researcher Patrick Wardle.

Zoom informed customers last week that macOS updates for the Zoom application patch two high-severity vulnerabilities. Details of the flaws were disclosed on Friday at the DEF CON conference in Las Vegas by macOS security researcher Patrick Wardle.

Wardle, who is the founder of the Objective-See Foundation, a non-profit that provides free and open source macOS security resources, showed at DEF CON how a local, unprivileged attacker could exploit vulnerabilities in Zoom’s update process to escalate privileges to root.

The researcher showed in his presentation that the macOS user is not prompted for their admin password when Zoom is updated, including when it’s automatically updated — the auto-update feature is enabled by default. He also showed how a malicious actor could hijack the update mechanism to downgrade Zoom to an older version that can contain known vulnerabilities.

Many researchers have found critical vulnerabilities in Zoom since the pandemic led to a wide adoption of the video conferencing platform. Google researchers, for instance, recently detailed a zero-click remote code execution exploit.

The attack described at DEF CON by Wardle involved a local attacker abusing the auto-update process, which can be initiated on demand, and leveraging a cryptographic flaw related to insecure update package signature validation — update packages can only be installed if they are signed by Zoom.

Zoom patched some related vulnerabilities in the past months, but Wardle said during his talk that his attack had still worked. One day after the presentation, however, Zoom announced the release of Zoom Client for Meetings for macOS 5.11.5 to patch the auto-update process vulnerability (CVE-2022-28756). Version 5.11.3, which should patch the packet signature validation issue (CVE-2022-28751), was announced on August 9, a few days before the DEF CON presentation.

The company pointed out that both the standard and IT admin versions of the application are affected.

Zoom has also informed customers about five other critical and high-severity vulnerabilities, including ones that could lead to remote code execution, privilege escalation, and the hijacking and disruption of meetings. Most of these flaws were discovered by Zoom’s own security team.

Also last week, at the Black Hat conference in Las Vegas, Wardle revealed that some commercial cybersecurity products had stolen algorithms from one of the free tools offered by his Objective-See Foundation.

Related: Zoom Patches Two Serious Vulnerabilities Found by Cisco Researchers

Related: Project Zero: Zoom Platform Missed ASLR Exploit Mitigation

Related: Details Disclosed for Zoom Exploit That Earned Researchers $200,000

Written By

Eduard Kovacs (@EduardKovacs) is a contributing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.

Click to comment

Daily Briefing Newsletter

Subscribe to the SecurityWeek Email Briefing to stay informed on the latest threats, trends, and technology, along with insightful columns from industry experts.

Join this webinar to learn best practices that organizations can use to improve both their resilience to new threats and their response times to incidents.


Join this live webinar as we explore the potential security threats that can arise when third parties are granted access to a sensitive data or systems.


Expert Insights

Related Content


Less than a week after announcing that it would suspended service indefinitely due to a conflict with an (at the time) unnamed security researcher...

Risk Management

The supply chain threat is directly linked to attack surface management, but the supply chain must be known and understood before it can be...


Apple has released updates for macOS, iOS and Safari and they all include a WebKit patch for a zero-day vulnerability tracked as CVE-2023-23529.

Application Security

Drupal released updates that resolve four vulnerabilities in Drupal core and three plugins.

Cloud Security

VMware vRealize Log Insight vulnerability allows an unauthenticated attacker to take full control of a target system.

Application Security

A CSRF vulnerability in the source control management (SCM) service Kudu could be exploited to achieve remote code execution in multiple Azure services.

IoT Security

Lexmark warns of a remote code execution (RCE) vulnerability impacting over 120 printer models, for which PoC code has been published.


GoAnywhere MFT users warned about a zero-day remote code injection exploit that can be targeted directly from the internet