CVE-2024-45421: Zoom SDK Privilege Escalation Vulnerability

CVE-2024-45421 Overview

CVE-2024-45421 is a heap-based buffer overflow vulnerability affecting multiple Zoom applications and software development kits. This vulnerability allows an authenticated user to escalate privileges through network access, potentially gaining elevated system permissions beyond their authorized scope.

The vulnerability stems from improper bounds checking in memory operations (CWE-122: Heap-based Buffer Overflow, CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer), which can be exploited by authenticated attackers with network access to the vulnerable Zoom components.

Critical Impact

Authenticated attackers can exploit this buffer overflow to escalate privileges, potentially gaining control over Zoom application processes and associated system resources across Windows, macOS, Linux, iOS, and Android platforms.

Affected Products

• Zoom Meeting Software Development Kit (Android, iOS, Linux, macOS, Windows)
• Zoom Rooms (iPadOS, macOS, Windows)
• Zoom Rooms Controller (Android, Linux, macOS, Windows)
• Zoom Video Software Development Kit (Android, iOS, Linux, macOS, Windows)
• Zoom Workplace (Android, iOS)
• Zoom Workplace Desktop (Linux, macOS, Windows)
• Zoom Workplace Virtual Desktop Infrastructure (Windows)

Discovery Timeline

• 2025-02-25 - CVE-2024-45421 published to NVD
• 2025-03-05 - Last updated in NVD database

Technical Details for CVE-2024-45421

Vulnerability Analysis

This vulnerability is a heap-based buffer overflow (CWE-122) that occurs when Zoom applications fail to properly validate the bounds of memory operations. The flaw also relates to the broader category of improper restriction of operations within the bounds of a memory buffer (CWE-119).

Buffer overflow vulnerabilities in client applications like Zoom can be particularly dangerous as they often process untrusted data from network sources. When an attacker can control the size or content of data written to a buffer, they may overwrite adjacent memory regions, including control structures, function pointers, or security-critical data.

The network-based attack vector means that authenticated users can potentially trigger this vulnerability during normal Zoom meeting operations, making it a concern for enterprise environments where Zoom is widely deployed.

Root Cause

The root cause of CVE-2024-45421 is improper bounds checking during memory operations within the Zoom application codebase. When processing certain network-delivered data, the application allocates a heap buffer but fails to properly validate that incoming data does not exceed the allocated buffer size. This allows an attacker to write beyond the intended memory boundaries.

Heap-based buffer overflows are particularly concerning because the heap contains dynamically allocated memory structures, including metadata used by the memory allocator. Corrupting this metadata can lead to arbitrary code execution or privilege escalation when the attacker carefully crafts their overflow payload.

Attack Vector

The attack vector for CVE-2024-45421 is network-based, requiring the attacker to be an authenticated user. The attack scenario involves:

1. An authenticated user joins a Zoom meeting or interacts with a Zoom component
2. The attacker sends specially crafted data through the network interface
3. The vulnerable Zoom component processes this data without proper bounds validation
4. The heap buffer overflow occurs, corrupting adjacent memory
5. The attacker leverages the memory corruption to escalate privileges

The vulnerability affects the application across multiple platforms (Windows, macOS, Linux, iOS, Android), indicating the flawed code exists in cross-platform components of the Zoom application suite.

For detailed technical information about the vulnerability, refer to the Zoom Security Bulletin ZSB-24043.

Detection Methods for CVE-2024-45421

Indicators of Compromise

• Unexpected crashes or abnormal termination of Zoom processes, particularly during meeting sessions
• Memory access violation errors or heap corruption warnings in application logs
• Unusual network traffic patterns during Zoom sessions, especially oversized or malformed packets
• Evidence of privilege escalation attempts following Zoom application usage

Detection Strategies

• Deploy endpoint detection and response (EDR) solutions to monitor for heap corruption and exploitation attempts in Zoom processes
• Implement network intrusion detection systems (NIDS) to identify anomalous traffic patterns targeting Zoom applications
• Enable application crash monitoring and forward crash dumps for analysis to identify exploitation attempts
• Monitor for unexpected child process creation from Zoom applications, which may indicate successful privilege escalation

Monitoring Recommendations

• Configure centralized logging to capture Zoom application events and crash reports across all endpoints
• Establish baselines for normal Zoom network behavior to detect anomalous activity
• Monitor system event logs for privilege changes associated with Zoom process identifiers
• Implement file integrity monitoring on Zoom installation directories to detect unauthorized modifications

How to Mitigate CVE-2024-45421

Immediate Actions Required

• Update all Zoom applications to the latest patched versions as specified in the vendor security bulletin
• Inventory all Zoom deployments including desktop clients, mobile apps, Rooms systems, and SDKs across the organization
• Prioritize patching systems in sensitive environments or those accessible to untrusted users
• Consider temporarily restricting Zoom usage on critical systems until patches are applied

Patch Information

Zoom has released security updates to address CVE-2024-45421. Organizations should apply the patches detailed in the Zoom Security Bulletin ZSB-24043. The bulletin provides specific version information for all affected products including:

• Zoom Meeting SDK
• Zoom Rooms and Rooms Controller
• Zoom Video SDK
• Zoom Workplace (Desktop, Mobile, and VDI)

Administrators should ensure automatic updates are enabled or manually deploy updates through enterprise software management tools.

Workarounds

• If patching is not immediately possible, restrict Zoom meeting access to only trusted authenticated users
• Implement network segmentation to limit the potential blast radius of any successful exploitation
• Deploy application-level firewalls or security proxies that can inspect Zoom traffic for malicious patterns
• Enable enhanced logging and monitoring on Zoom deployments to detect potential exploitation attempts

# Example: Check Zoom client version on macOS
/Applications/zoom.us.app/Contents/MacOS/zoom.us --version

# Example: Check Zoom client version on Windows (PowerShell)
Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*" | Where-Object {$_.DisplayName -like "*Zoom*"} | Select-Object DisplayName, DisplayVersion