CVE-2023-34057: VMware Tools Privilege Escalation Flaw

CVE-2023-34057 Overview

CVE-2023-34057 is a local privilege escalation vulnerability affecting VMware Tools on macOS systems. A malicious actor with local user access to a guest virtual machine may exploit this vulnerability to elevate privileges within the virtual machine, potentially gaining unauthorized administrative control over the guest OS.

Critical Impact

This vulnerability allows attackers with local access to escalate their privileges within VMware guest virtual machines running macOS, enabling them to gain full control over the compromised system.

Affected Products

• VMware Tools (on macOS)
• Apple macOS (as the underlying guest operating system)

Discovery Timeline

• 2023-10-27 - CVE-2023-34057 published to NVD
• 2025-03-06 - Last updated in NVD database

Technical Details for CVE-2023-34057

Vulnerability Analysis

This vulnerability is classified under CWE-269 (Improper Privilege Management), indicating a fundamental flaw in how VMware Tools handles privilege assignments or access control on macOS guest systems. The vulnerability enables local privilege escalation, meaning an attacker who already has some level of access to the virtual machine can leverage this flaw to obtain elevated permissions beyond their intended authorization level.

The attack requires local access to the guest virtual machine, meaning the attacker must first establish a foothold on the target system. Once local access is obtained, the vulnerability can be exploited without requiring any user interaction, making it particularly dangerous in environments where multiple users have access to the same virtual machine or where initial compromise has already occurred.

Root Cause

The root cause of CVE-2023-34057 lies in improper privilege management within VMware Tools for macOS. This weakness occurs when software fails to properly restrict access to elevated privileges or incorrectly manages the assignment of privileged resources. In this case, VMware Tools does not adequately enforce privilege boundaries, allowing a local user to escalate their access rights within the guest virtual machine environment.

Attack Vector

The attack vector for this vulnerability is local, requiring the attacker to have existing access to the guest virtual machine. The exploitation flow typically involves:

1. An attacker gains initial local user access to a macOS guest virtual machine running VMware Tools
2. The attacker identifies and exploits the privilege management flaw in VMware Tools
3. Successfully exploiting the vulnerability grants the attacker elevated privileges within the virtual machine
4. With elevated privileges, the attacker can access sensitive data, install malware, modify system configurations, or pivot to other systems

The vulnerability requires low attack complexity and low privileges to exploit, with no user interaction needed. This combination makes it attractive to attackers who have already established initial access through other means such as phishing, credential theft, or exploitation of other vulnerabilities.

Detection Methods for CVE-2023-34057

Indicators of Compromise

• Unexpected privilege escalation events in macOS system logs within VMware guest virtual machines
• Unusual processes running with elevated privileges that originate from low-privilege user contexts
• Suspicious modifications to VMware Tools components or configurations
• Anomalous system calls or API usage patterns associated with privilege management functions

Detection Strategies

• Monitor VMware Tools processes for abnormal behavior or unexpected privilege level changes
• Implement file integrity monitoring on VMware Tools binaries and configuration files
• Deploy endpoint detection and response (EDR) solutions capable of detecting privilege escalation attempts
• Review audit logs for privilege changes that do not correlate with legitimate administrative activities

Monitoring Recommendations

• Enable comprehensive logging on macOS guest virtual machines, particularly for authentication and authorization events
• Configure alerting for any privilege escalation attempts or successful privilege changes
• Establish baseline behavior for VMware Tools processes and alert on deviations
• Implement centralized log collection from all guest virtual machines to correlate potential attack patterns

How to Mitigate CVE-2023-34057

Immediate Actions Required

• Update VMware Tools to the latest patched version as specified in the VMware Security Advisory VMSA-2023-0024
• Audit all macOS guest virtual machines to identify those running vulnerable versions of VMware Tools
• Restrict local user access to guest virtual machines to only authorized personnel
• Implement the principle of least privilege for all virtual machine user accounts

Patch Information

VMware has released security updates to address this vulnerability. Administrators should consult the VMware Security Advisory VMSA-2023-0024 for specific patching instructions and affected version information. It is critical to apply the available patches as soon as possible, especially in environments where guest virtual machines may be accessible to potentially untrusted users.

Workarounds

• Limit local user access to macOS guest virtual machines to only trusted administrators until patches can be applied
• Implement additional access controls and monitoring on virtual machines running vulnerable VMware Tools versions
• Consider temporarily isolating affected virtual machines from sensitive network segments
• Use application allowlisting to restrict unauthorized process execution on guest virtual machines

# Verify VMware Tools version on macOS guest
/Library/Application\ Support/VMware\ Tools/vmware-tools-cli -v

# Check for VMware Tools updates via VMware Fusion or vSphere
# Ensure you are running the patched version as specified in VMSA-2023-0024