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Vulnerability Alert

Cisco NX-OS Software Label Distribution Protocol Message Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:32532
Version:1
First Published:2014 January 23 17:21 GMT
Last Published:2014 January 23 17:21 GMT
Port: Not available
CVE:CVE-2014-0677
BugTraq ID:65074
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:5.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:4.8
Related Resources:
View related Security Notice
 
 
Version Summary:Cisco NX-OS Software 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 Label Distribution Protocol (LDP) message processing of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause an affected device to stop accepting valid LDP sessions during a 60-second period.

The vulnerability is due to how certain malformed LDP Hello messages are parsed. An attacker could exploit this vulnerability by sending malformed LDP Hello messages to an affected device. An exploit could allow the attacker to cause an affected device to stop accepting valid LDP sessions during a 60-second period.

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 Release 6.2(2a) and prior were vulnerable. Later releases of Cisco NX-OS Software may also be vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker would likely need access to trusted, internal networks to send LDP Hello messages to an affected device. This access requirement limits the possibility of a successful exploit.

Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
 
Vendor Announcements
Cisco has released a security notice at the following link: CVE-2014-0677

Customers are advised to consult Cisco bug ID CSCul88851 for the most complete list of affected product versions.
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause an affected device to stop accepting valid LDP sessions during a 60-second period, resulting in a denial of service (DoS) condition.
 
Technical Information
The vulnerability is due to improper processing of certain malformed LDP Hello messages by the affected software.

An unauthenticated, remote attacker could exploit this vulnerability by sending malformed LDP Hello messages to an affected device. An exploit could allow the attacker to cause an affected device to stop accepting valid LDP sessions during a 60-second period, 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 can help protect affected systems from external attacks by using a solid firewall strategy.

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 7000 Series Base, 4.1.(2), 4.1.(3), 4.1.(4), 4.1.(5), 4.2.(2a), 4.2(3), 4.2(4), 4.2(6), 4.2(8), 5.0(2a), 5.0(3), 5.0(5), 5.1(1), 5.1(1a), 5.1(3), 5.1(4), 5.1(5), 5.1(6), 5.2(1), 5.2(3a), 5.2(4), 5.2(5), 5.2(7), 5.2(9), 6.0(1), 6.0(2), 6.0(3), 6.0(4), 6.1(1), 6.1(2), 6.1(3), 6.1(4), 6.1(4a), 6.2(2), 6.2(2a)

Associated Products:
N/A




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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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