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Vulnerability Alert

Cisco Nexus 1000V ESXi Hypervisor Denial of Service Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:29470
Version:1
First Published:2013 May 29 15:50 GMT
Last Published:2013 May 29 15:50 GMT
Port: Not available
CVE:CVE-2013-1210
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:5.4 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.1
 
 
Version Summary:Cisco Nexus 1000V contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are not available.
 
 
Description
A vulnerability in the Cisco Nexus 1000V Virtual Ethernet Module (VEM) kernel driver for VMware ESXi could allow an unauthenticated, remote attacker to cause the ESXi hypervisor to crash, resulting in a purple screen of death (PSOD).

The vulnerability is due to insufficient validation of STUN protocol packets, which results in a crash of the ESXi hypervisor due to an out of bound array index access. An attacker could exploit this vulnerability by sending specially crafted STUN packets to a vulnerable VEM. This vulnerability requires that STUN protocol debugging be enabled on the VEM kernel driver for VMware ESXi.

Cisco would like to thank Felix 'FX' Lindner, Recurity Labs GmbH, for reporting this issue to us.

Cisco has confirmed the vulnerability in a security notice; however, software updates are not available.
 
Warning Indicators
At the time this alert was first published, Cisco NX-OS Software for Nexus 1000 Series 4.2(1)SV1(5.1) and prior is vulnerable. Later releases of Cisco NX-OS Software for Nexus 1000 Series may also be affected.
 
IntelliShield Analysis
To exploit this vulnerability, the attacker would likely need access to a trusted, internal network to send specially crafted STUN packets to a targeted device. This access restriction limits the possibility of a successful exploit.

Customers are advised to review the bug reports in the "Vendor Announcements" section for a current list of affected versions.
 
Vendor Announcements
Cisco has released a security notice for bug ID CSCud14825 at the following link: CVE-2013-1210
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause the VMware ESXi hypervisor to crash, resulting in a denial of service (DoS) condition.
 
Technical Information
The vulnerability is due to insufficient validation of STUN protocol packets by the Cisco Nexus 1000V VEM kernel driver for the VMware ESXi hypervisor.

An unauthenticated, remote attacker could exploit this vulnerability by sending specially crafted STUN packets to a vulnerable VEM. If successful, the attacker could cause an out of bound array index access, which could cause the ESXi hyperviosr to crash, resulting in a DoS condition.
 
Safeguards
Administrators are advised to contact the vendor regarding future updates and releases.

Administrators are advised to allow only trusted users to have network access.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Administrators are advised to monitor affected systems.
 
Patches/Software
Software updates are not available.
 
Alert History
 
Initial Release


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
CiscoCisco NX-OS Software for Nexus 1000 Series 4.2(1)SV1(5.1)

Associated Products:
N/A




Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service. This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.


LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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