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Cisco Security Advisory

Multiple Vulnerabilities in Cisco NX-OS-Based Products

Advisory ID: cisco-sa-20140521-nxos

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140521-nxos

Revision 2.3

Last Updated  2014 June 2 20:25  UTC (GMT)

For Public Release 2014 May 21 16:00  UTC (GMT)

Related Resources:


Summary

Cisco Nexus, Cisco Unified Computing System (UCS), and Cisco 1000 Series Connected Grid Routers (CGR) are all based on the Cisco NX-OS operating system. These products are affected by one or more of the following vulnerabilities:

  • Cisco NX-OS Virtual Device Context SSH Privilege Escalation Vulnerability
  • Cisco NX-OS Virtual Device Context SSH Key Privilege Escalation Vulnerability
  • Cisco NX-OS-Based Products Smart Call Home Buffer Overflow Vulnerability
  • Cisco NX-OS Message Transfer Service Denial of Service Vulnerability 
    • No officially released images are affected
Cisco has released free software updates that address these vulnerabilities.

This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140521-nxos

Affected Products

Cisco products running or based on the Cisco NX-OS Software high-speed routing and switching platform are affected by one or more of the vulnerabilities detailed in this advisory.

Vulnerable Products

The following products are vulnerable:

  UCS 6100 UCS 6200 Nexus 9000 Nexus 7000 Nexus 6000 Nexus 5000 Nexus 4000 Nexus 3000 Nexus 1000v MDS 9000 CGR 1000
Cisco NX-OS Virtual Device Context SSH Privilege Escalation Vulnerability 
 CVE-2014-2200
      X              
Cisco NX-OS Virtual Device Context SSH Key Privilege Escalation Vulnerability
CVE-2013-1191
      X              
Cisco NX-OS-Based Products Smart Call Home Buffer Overflow Vulnerability
 CVE-2014-3261
X X   X   X X X     X
Cisco NX-OS Message Transfer Service Denial of Service Vulnerability
 CVE-2014-2201
No Officially Released Versions are Affected
     
             
Recommended Release 2.2(1d) 2.2(1d) N/A 6.2(8) N/A

5.2(1)N1(7)
6.0(2)N2(4)
7.0(2)N1(1)

4.1(2)E1(11) 5.0(3)U5(1)
6.0(2)U2(4)
N/A N/A CG4(3)
15.4(1)CG

Legend:

UCS 6100 = Cisco Unified Computing Server Fabric Interconnect 6100 Series devices
UCS 6200 = Cisco Unified Computing Server Fabric Interconnect 6200 Series devices
Nexus 9000 = Cisco Nexus 9000 Series devices
Nexus 7000 = Cisco Nexus 7000 Series devices
Nexus 6000 = Cisco Nexus 6000 Series devices
Nexus 5000 = Cisco Nexus 5000 Series and Cisco Nexus 5500 Series devices
Nexus 4000 = Cisco Nexus 4000 Series blade devices
Nexus 3000 = Cisco Nexus 3000 and Cisco Nexus 3500 Series devices
Nexus 1000V = Cisco Nexus 1000V Series Switches and 1010 Virtual Services Appliances
MDS 9000 = Cisco MDS 9000 Multilayer Switch/Director Family devices
CGR 1000 = Cisco 1000 Series Connected Grid Router devices

Note: The recommended software releases above resolve all issues impacting each platform in the preceding table.

Products Confirmed Not Vulnerable

  • Cisco Nexus 9000 Series
  • Cisco Nexus 7700 Series
  • Cisco Nexus 6000 Series
  • Cisco Nexus 5600 Series
  • Cisco Nexus 2000 Series
  • Cisco Nexus 1000V Series
  • Cisco Nexus 1010 Series Application Services Platforms
  • Cisco Nexus 1100 Series Cloud Services Platforms
  • Cisco MDS 9000 Multilayer Switch/Director Family devices 
No other Cisco products are currently known to be affected by these vulnerabilities.

Details

Cisco NX-OS Virtual Device Context SSH Privilege Escalation Vulnerability

Cisco NX-OS-Based devices contain a privilege escalation vulnerability when multiple virtual device contexts (VDC) exist on the system and local authentication has been configured. A remote, authenticated attacker that can access the management interfaces via SSH of an affected device could authenticate in such a way as to obtain the privileges of an administrator in another VDC. Under certain conditions this may allow an attacker to take complete control of the affected device.

This vulnerability is documented in Cisco bug ID CSCti11629 (registered customers only) and has been assigned the following Common Vulnerabilities and Exposures (CVE) ID CVE-2014-2200.

Cisco NX-OS Virtual Device Context SSH Key Privilege Escalation Vulnerability

Cisco NX-OS-Based devices contain a privilege escalation vulnerability when multiple virtual device contexts (VDCs) exist on the system and local authentication has been configured. A remote, authenticated attacker who can access the SSH management interfaces of an affected device could manipulate the login information supplied as part of the SSH key file to exploit the vulnerability. This could allow the attacker to obtain the privileges of an administrator in another VDC. Under certain conditions, this may allow the attacker to take complete control of the affected device.

This vulnerability is documented in Cisco bug ID CSCud88400 (registered customers only) and has been assigned CVE ID CVE-2013-1191.

Cisco NX-OS-Based Products Smart Call Home Buffer Overflow Vulnerability

Cisco NX-OS-Based products that support the Smart Call Home feature set are affected by a buffer overflow vulnerability. An unauthenticated, remote attacker who can obtain control of a configured SMTP server could trigger a buffer overflow condition. Successful exploitation could allow the attacker to execute arbitrary code with elevated privileges on the affected device.

This vulnerability is due to a failure to properly sanitize input received from remote hosts while sending a Smart Call Home notification.

Devices running an affected version of software contain the vulnerability, these devices are only at risk if they have configured Smart Call Home to utilize SMTP reporting.

This vulnerability is documented in the following Cisco bug IDs: The vulnerability has been assigned CVE ID CVE-2014-3261.

Cisco NX-OS Message Transfer Service Denial of Service Vulnerability

Further engineering efforts have determined that no officially released images are affected by this vulnerability. Customers running a pre-release version of NX-OS 6.0 may be affected and are advised to update to an official release.

 A vulnerability in the Message Transfer Service (MTS) of version 6.0(1) of Cisco NX-OS could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition.

The vulnerability is due to a NULL pointer dereference that may occur when an affected device is under a heavy load. An attacker could exploit this vulnerability by sending a significant amount of specially designed traffic to trigger the condition. An exploit could allow the attacker to cause a kernel panic, resulting in a DoS condition.

This vulnerability is documented in Cisco bug ID CSCtw98915 (registered customers only) and has been assigned CVE ID CVE-2014-2201.

Vulnerability Scoring Details

Cisco has scored the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this security advisory is in accordance with CVSS version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps organizations determine the urgency and priority of a response.

Cisco has provided a base and temporal score. Customers can also compute environmental scores that help determine the impact of the vulnerability in their own networks.

Cisco has provided additional information regarding CVSS at the following link:
http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html

Cisco has also provided a CVSS calculator to compute the environmental impact for individual networks at the following link:
http://intellishield.cisco.com/security/alertmanager/cvss


Cisco NX-OS Virtual Device Context SSH Privilege Escalation Vulnerability - CSCti11629

Calculate the environmental score of CSCti11629

CVSS Base Score - 7.1

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

High

Single

Complete

Complete

Complete

CVSS Temporal Score - 5.9

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed





Cisco NX-OS Virtual Device Context SSH Key Privilege Escalation Vulnerability - CSCud88400

Calculate the environmental score of CSCud88400

CVSS Base Score - 7.1

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

High

Single

Complete

Complete

Complete

CVSS Temporal Score - 5.9

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed





Cisco NX-OS-Based Products Smart Call Home Buffer Overflow Vulnerability - CSCtk00695, CSCts56633, CSCts56632, CSCts56628, CSCuf61322, CSCug14405

Calculate the environmental score of CSCtk00695

CVSS Base Score - 7.6

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

High

None

Complete

Complete

Complete

CVSS Temporal Score - 6.3

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed




Cisco NX-OS Message Transfer Service Denial of Service Vulnerability - CSCtw98915

Calculate the environmental score of CSCtw98915

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed


Impact

Successful exploitation of either the Cisco NX-OS Virtual Device Context SSH Privilege Escalation Vulnerability or the Cisco NX-OS Virtual Device Context SSH Key Privilege Escalation Vulnerability may allow an attacker to gain privileged access to a VDC in which the attacker does not otherwise have access.

Successful exploitation of the Cisco NX-OS-Based Products Smart Call Home Buffer Overflow Vulnerability may allow an attacker to execute arbitrary code with elevated privileges. This could result in a complete compromise of the affected device.

Successful exploitation of the Cisco NX-OS Message Transfer Service Denial of Service Vulnerability may allow an attacker to create a DoS condition on the affected device. In some instances administrator intervention may be required to return the device to operational status.

Software Versions and Fixes

When considering software upgrades, customers are advised to consult the Cisco Security Advisories, Responses, and Notices archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

Cisco Unified Computing System:
Cisco NX-OS-Based Products Smart Call Home Buffer Overflow Vulnerability

Affected Version
First Fixed Release
Recommended Release
 1.0 N/A  2.2(1d)
 1.1 N/A  2.2(1d)
 1.2 N/A  2.2(1d)
 1.3 N/A  2.2(1d)
 1.4(1h) and prior 1.4(1i)  2.2(1d)


Cisco Nexus 7000:
Cisco NX-OS Virtual Device Context SSH Privilege Escalation Vulnerability

Affected Version First Fixed Release> Recommended Release
 4.X N/A  6.2(8)
5.0(2a) and prior 5.0(5)  6.2(8)

Cisco NX-OS Virtual Device Context SSH Key Privilege Escalation Vulnerability

Affected Version First Fixed Release Recommended Release
 4.X N/A  6.2(8)
 5.X N/A  6.2(8)
 6.0 N/A  6.2(8)
 6.1(4a) and prior 6.1(5)  6.2(8)

Cisco NX-OS-Based Products Smart Call Home Buffer Overflow Vulnerability

Affected Version First Fixed Release Recommended Release
 4.X N/A  6.2(8)
 5.0 N/A  6.2(8)
 5.1 N/A  6.2(8)
5.2(3) and prior 5.2(3a)  6.2(8)


Cisco Nexus 5000:
Cisco NX-OS-Based Products Smart Call Home Buffer Overflow Vulnerability

Affected Version First Fixed Release Recommended Release
 4.X  N/A  5.2(1)N1(7)
 6.0(2)N2(4)
 7.0(2)N1(1)
 5.0  5.1(3)N1(1)  5.2(1)N1(7)
 6.0(2)N2(4)
 7.0(2)N1(1)

Cisco Nexus 4000:
Cisco NX-OS-Based Products Smart Call Home Buffer Overflow Vulnerability

Affected Version First Fixed Release Recommended Release
 4.1(2)E1(1k) and prior 4.1(2)E1(1l)  4.1(2)E1(1l)

Cisco Nexus 3000:
Cisco NX-OS-Based Products Smart Call Home Buffer Overflow Vulnerability

Affected Version First Fixed Release Recommended Release
 5.0(3)U2(1) and prior 5.0(3)U2(2)  5.0(3)U5(1j)
 6.0(2)U2(4)

Cisco 1000 Series Connected Grid Router:
Cisco NX-OS-Based Products Smart Call Home Buffer Overflow Vulnerability

Affected Version First Fixed Release Recommended Release
 CG3  N/A  CG4(3)
 15.4(1)CG
 CG4(1)  CG4(2)  CG4(3)
 15.4(1)CG

Workarounds

No workarounds are available.

Obtaining Fixed Software

Cisco has released free software updates that address the vulnerabilities described in this advisory. Prior to deploying software, customers are advised to consult their maintenance providers or check the software for feature set compatibility and known issues that are specific to their environments.

Customers may only install and expect support for feature sets they have purchased. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html.

Customers with Service Contracts

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, upgrades should be obtained through the Software Navigator on Cisco.com at http://www.cisco.com/cisco/software/navigator.html.

Customers Using Third-Party Support Organizations

Customers with Cisco products that are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers, should contact that organization for assistance with the appropriate course of action.

The effectiveness of any workaround or fix depends on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Because of the variety of affected products and releases, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed.

Customers Without Service Contracts

Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC):
  • +1 800 553 2447 (toll free from within North America)
  • +1 408 526 7209 (toll call from anywhere in the world)
  • email: tac@cisco.com
Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. Customers without service contracts should request free upgrades through the TAC.

Refer to Cisco Worldwide Contacts at http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, instructions, and email addresses for support in various languages.

Exploitation and Public Announcements

The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.

These vulnerabilities were discovered during internal testing and during the investigation of customer cases by the Cisco TAC.

Status of This Notice: Final

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.


Distribution

This advisory is posted on Cisco Security Intelligence Operations at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140521-nxos

Additionally, a text version of this advisory is clear signed with the Cisco PSIRT PGP key and circulated among the following email addresses:
  • cust-security-announce@cisco.com
  • first-bulletins@lists.first.org
  • bugtraq@securityfocus.com
  • vulnwatch@vulnwatch.org
  • cisco@spot.colorado.edu
  • cisco-nsp@puck.nether.net
  • full-disclosure@lists.grok.org.uk
Future updates of this advisory, if any, will reside on Cisco.com but may not be announced on mailing lists. Users can monitor this advisory's URL for any updates.

Revision History

Revision 2.3 2014-June-02 Updated Recommended Version in Nexus 7000 Software tables for the Cisco NX-OS Virtual Device Context SSH Privilege Escalation Vulnerability to match other tables.
Revision 2.2 2014-May-29 Removed Nexus 5500UP devices from the Confirmed Not Vulnerable section. While these devices shipped with a non-vulnerable version of NX-OS, they are capable of running an affected version of 5.0(3).
Revision 2.1 2014-May-28 Added a clarifying statement to the Smart Call Home vulnerability to stipulate that SCH must be configured to utilize SMTP as the reporting method.
Revision 2.0 2014-May-28 Further engineering efforts have determined that no officially released images are affected by the Message Transfer Service Denial of Service vulnerability. Customers running a pre-release version of NX-OS 6.0 may be affected and are advised to update to an official release. MDS 9000 Family moved to Products Confirmed Not Vulnerable.
Revision 1.1 2014-May-21 Updated tables for legibility purposes.
Revision 1.0 2014-May-21 Initial public release.

Cisco Security Procedures

Complete information about reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco is available on Cisco.com at http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html. This web page includes instructions for press inquiries regarding Cisco Security Advisories. All Cisco Security Advisories are available at http://www.cisco.com/go/psirt.
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