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Vulnerability Alert

Cisco Nexus 1000V VSM/VEM Communication Encryption Bypass Vulnerability

 
Threat Type:CWE-310: Cryptographic Issues
IntelliShield ID:29472
Version:1
First Published:2013 May 29 16:52 GMT
Last Published:2013 May 29 16:52 GMT
Port: Not available
CVE:CVE-2013-1208
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:5.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.5
 
Version Summary:Cisco Nexus 1000V contains an issue that could allow an unauthenticated, remote attacker to inject traffic or eavesdrop on communications between a Virtual Supervisor Module and a Virtual Ethernet Module. Updates are not available.
 
 
Description
Cryptographic issues in the Cisco Nexus 1000v could allow an unauthenticated, remote attacker to to inject traffic or eavesdrop on the communications between a Virtual Supervisor Module (VSM) and a Virtual Ethernet Module (VEM).

The issues are due to errors in the implementation of the cryptography employed for VSM to VEM communications. An attacker must have access to the Layer 2 management VLAN or the Layer 3 management traffic to exploit these issues.

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

Cisco has confirmed the issue 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 affected. Later releases of Cisco NX-OS Software for Nexus 1000 Series may also be affected.
 
IntelliShield Analysis
To exploit this issue, the attacker would likely need access to a trusted, internal network in which the targeted device may reside. 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 CSCud14691 at the following link: CVE-2013-1208
 
Impact
An unauthenticated, remote attacker could exploit this issue to inject traffic or eavesdrop on communications between a VSM and a VEM. Successful exploitation could result in information disclosure, or allow an attacker to inject arbitrary traffic that could be leveraged to conduct further attacks.
 
Technical Information
The issue is due to unspecified errors in the implementation of the cryptography employed for VSM to VEM communications by the affected software.

An unauthenticated, remote attacker with access to the Layer 2 management VLAN or the Layer 3 management traffic could exploit this issue to inject traffic or eavesdrop on the communications between a VSM and a VEM. Successful exploitation could be leveraged to conduct further attacks.
 
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.

It is critical to prevent unauthorized direct communication to network devices. Restrict network traffic destined for the network infrastructure to protect against reconnaissance and denial of service attacks. For configuration details, see Protecting Your Core: Infrastructure Protection Access Control Lists.

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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