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Research > Zero-Day Tracker > 20130328

VMware ESXi and ESX libxml2 Buffer Underflow

Date Disclosed:
3/28/2013

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.

Vendor:
VMware

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

Description:
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.

Severity:
Moderate

Code Execution:
Yes.

Impact:
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.

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

Protection:
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

Links:

Status:
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.

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