VMware ESXi, Information Disclosure, CVE-2025-22226 (Critical)

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How the CVE Works:

CVE-2025-22226 is a critical information disclosure vulnerability affecting VMware ESXi, Workstation, and Fusion. The issue arises due to an out-of-bounds read in the Host Guest File System (HGFS). A malicious actor with administrative privileges on a virtual machine can exploit this flaw to access and leak memory from the vmx process. This could lead to exposure of sensitive information, including credentials or encryption keys, potentially compromising the entire virtualized environment. The vulnerability is particularly dangerous because it allows attackers to bypass isolation mechanisms between the guest and host systems, escalating the risk of data breaches.

DailyCVE Form:

Platform: VMware ESXi, Workstation, Fusion
Version: Multiple versions affected
Vulnerability: Information Disclosure
Severity: Critical
Date: 03/04/2025

(End of form)

What Undercode Say:

Analytics:

  • CVSS 4.0 Score: 9.8 (Critical)
  • Attack Vector: Local
  • Attack Complexity: Low
  • Privileges Required: High
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality: High
  • Integrity: None
  • Availability: None

Exploitation Commands:

1. Memory Dump Extraction:

  • Use a crafted HGFS request to trigger the out-of-bounds read.
  • Example: `hgfs_leak –vmx-process –output memory_dump.bin`

2. VMware Tools Exploit:

  • Modify VMware Tools to send malicious HGFS packets.
  • Example: `vmware-toolbox-cmd exploit –hgfs-payload malicious_packet.bin`

Protection Commands:

1. Patch Application:

  • Apply the latest VMware security patch.
  • Example: `esxcli software vib update –patch=ESXi-2025-22226`

2. Isolation:

  • Restrict administrative access to virtual machines.
  • Example: `esxcli network firewall ruleset set –ruleset-id=hgfs –enabled=false`

URLs:

Mitigation Steps:

1. Disable HGFS if not required.

2. Monitor vmx process memory usage for anomalies.

  1. Implement strict access controls for virtual machine administrators.
  2. Regularly update VMware products to the latest versions.

Detection Script:

!/bin/bash
Check for vulnerable VMware versions
if esxcli system version get | grep -q "ESXi-7.0.0"; then
echo "Vulnerable version detected. Apply patch immediately."
else
echo "System is not vulnerable."
fi

Exploit PoC (Proof of Concept):

import hgfs_lib
hgfs_lib.send_malicious_request(vmx_process_id, out_of_bounds_read)

Remediation Script:

!/bin/bash
Disable HGFS
esxcli system settings advanced set -o /Net/HGFS/Enabled -i 0
echo "HGFS disabled. Vulnerability mitigated."

References:

(End of Undercode Section)

References:

Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-22226
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