eEye Digital Security eEye Digital Security
  • Login to the eEye Business Client Portal
  • Shop for eEye Products
  • Read the eEye Blog
  • Subscribe to eEye RSS Feeds
  • Follow eEye on Twitter
  • Follow eEye of Facebook

Research > Zero-Day Tracker > 20130328

VMware ESXi and ESX libxml2 Buffer Underflow

Date Disclosed:

Date Patched:
4/25/2013 for ESXi 5.1, 3/28/2013 for ESXi 5.0, 4/30/13 for ESXi 4.1 and 4.0, and ESX 4.1 and 4.0.


Affected Software:
VMware ESXi 4.1 and 4.0
VMware ESX 4.1 and 4.0

VMware ESXi 4.1 and 4.0, as well as VMware ESX 4.1 and 4.0 contain a heap-based buffer underrun within libxml2, specifically, the xmlParseAttValueComplex function. This vulnerability may be leveraged by attackers to arbitrarily execute code.


Code Execution:

Code Execution
Exploitation of these vulnerabilities is possible via maliciously crafted XML documents. Attackers who successfully exploit this vulnerability will be able to execute code on the vulnerable system with the same rights as the currently logged on user or service using libxml2.

Install the available patch for ESXi 5.0 and 5.1; otherwise, no mitigation is currently available, other than to avoid untrusted XML documents.

BeyondTrust's Retina® Network Security Scanner scans devices to detect for this vulnerability.

  • 18614 - VMware ESX/ESXi Server libxml2 Vulnerability (20130328) - ESXi 5.1
  • 18615 - VMware ESX/ESXi Server libxml2 Vulnerability (20130328) - ESXi 5.0
  • 18616 - VMware ESX/ESXi Server libxml2 Vulnerability (20130328) - ESXi 4.1
  • 18617 - VMware ESX/ESXi Server libxml2 Vulnerability (20130328) - ESXi 4.0
  • 18618 - VMware ESX/ESXi Server libxml2 Vulnerability (20130328) - ESX 4.1/4.0


2012-11-28 - CVE-2012-5134 released
2013-03-28 - VMware Security Advisory released
2013-04-25 - VMware patched ESXi 5.1
2013-04-30 - VMware patched remaining vulnerable releases.

Copyright ©1998-2011 eEye Digital Security
Permission is hereby granted for the redistribution of this alert electronically. It is not to be edited in any way without express consent of eEye. If you wish to reprint the whole or any part of this alert in any other medium excluding electronic medium, please email for permission.

The information within this paper may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are no warranties, implied or express, with regard to this information. In no event shall the author be liable for any direct or indirect damages whatsoever arising out of or in connection with the use or spread of this information. Any use of this information is at the user's own risk.

Next Steps

Free Trial
Test drive an eEye product
On-demand Demo
See an online product tour
One-on-one Demo
Schedule a personalized tour
Compare Products
See side-by-side features
Buy Now
Go to eEye product store
Contact | Site Map | Privacy | Website Feedback | 1.866.339.3732
© 1998 – 2012 eEye Digital Security. All rights reserved.