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Vulnerability Alert

Cisco NX-OS Software Jumbo Packet Denial of Service Vulnerability

 
Threat Type:CWE-20: Input Validation
IntelliShield ID:29024
Version:1
First Published:2013 April 24 16:14 GMT
Last Published:2013 April 24 16:14 GMT
Port: Not available
CVE:CVE-2013-1181
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.4
Related Resources:
View related Security Advisory
 
 
Version Summary:Cisco NX-OS Software-based devices contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
 
 
Description
Cisco NX-OS based devices contain a denial of service (DoS) vulnerability.  An unauthenticated, remote attacker who can send a jumbo frame packet to the management interface of an affected device could cause the device to crash and reload.

The vulnerability is due to improper input validation of jumbo packets.  Large packets that are sent through the switching fabric of the device will not trigger the vulnerability.


Cisco confirmed the vulnerability in a security advisory and released software updates.
 
Warning Indicators
Cisco NX-OS Software-based devices running an affected release of Cisco NX-OS Software are vulnerable.

Cisco has published a list of affected Cisco NX-OS Software Releases and affected Cisco NX-OS Software-based devices in a security advisory. The "Vendor Announcements" section of this alert contains a link to the advisory.
 
IntelliShield Analysis
It is likely that an attacker would need access to an internal, trusted network to send jumbo frame packets to the management interface on a targeted device. This access requirement decreases the likelihood 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 advisory for Cisco bug IDs  CSCtx17544, CSCts10593, and CSCtx95389 at the following link: cisco-sa-20130424-nxosmulti
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause an affected device to reload, resulting in a DoS condition. A sustained attack could result in an extended DoS condition.
 
Technical Information
The vulnerability is due to improper input validation of jumbo packets processed by the affected software.

An unauthenticated, remote attacker could exploit this vulnerability by sending jumbo frame packets to the management interface of an affected device. If successful, the attacker could cause the targeted device to crash and reload, resulting in a DoS condition.
 
Safeguards
Administrators are advised to apply the appropriate updates.

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

The Cisco Applied Intelligence team has created the following companion document to guide administrators in identifying and mitigating attempts to exploit this vulnerability prior to applying updated software: Identifying and Mitigating Exploitation of Multiple Vulnerabilities in Cisco NX-OS Based Products

Administrators are advised to monitor affected systems.
 
Patches/Software
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at tac@cisco.com.
 
Alert History
 
Initial Release


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

Primary Products:
CiscoCisco NX-OS Software for Nexus 3000 Series Base, 5.0(3)U1(1), 5.0(3)U1(1a), 5.0(3)U1(1b), 5.0(3)U1(1d), 5.0(3)U1(2), 5.0(3)U1(2a), 5.0(3)U2(1), 5.0(3)U2(2), 5.0(3)U2(2a), 5.0(3)U2(2b), 5.0(3)U2(2c), 5.0(3)U2(2d), 5.0(3)U3(1) | for Nexus 5000 Series Base, 4.0(0)N1(1a), 4.0(0)N1(2), 4.0(0)N1(2a), 4.0(1a)N1(1), 4.0(1a)N1(1a), 4.0(1a)N2(1), 4.0(1a)N2(1a), 4.1(3)N1(1), 4.1(3)N1(1a), 4.1(3)N2(1), 4.1(3)N2(1a), 4.2(1)N1(1), 4.2(1)N2(1), 4.2(1)N2(1a), 5.0(2)N1(1), 5.0(3)N1(1c), 5.0(2)N2(1), 5.0(2)N2(1a), 5.0(3)N2(1)
CiscoCisco Unified Computing System (Managed) 1.0 Base, (2k) | 1.1 Base, (1m) | 1.2 Base, (1d) | 1.3 (1c), (1m), (1n), (1o), (1p), (1q), (1t), (1w), (1y) | 1.4 Base, (1i), (1j), (1m), (3i), (3l), (3m), (3q), (3s), (3u), (3y), (4f), (4g), (4i), (4j), (4k) | 2.0 Base, (1m), (1q), (1s), (1t)

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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