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Vulnerability Alert

Cisco NX-OS Software SNMP Buffer Overflow Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:29023
Version:1
First Published:2013 April 24 16:18 GMT
Last Published:2013 April 24 16:18 GMT
Port: 161
CVE:CVE-2013-1180
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.0 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.4
Related Resources:
View related Security AdvisoryView related IPS Signature
 
 
Version Summary:Cisco NX-OS Software contains a buffer overflow vulnerability that could allow an authenticated, remote attacker to execute arbitrary code with elevated privileges. Updates are available.
 
 
Description
Cisco NX-OS-based devices contain a buffer overflow vulnerability in the Simple Network Management Protocol (SNMP) subsystem. An authenticated, remote attacker who can submit a malicious SNMP query via UDP port 161 could exploit the vulnerability to trigger a buffer overflow condition in the SNMP component of the device. Successful exploitation could allow the attacker to execute arbitrary code with elevated privileges.

SNMP is disabled by default and must be explicitly configured by an administrator. Because SNMP is primarily a UDP-based protocol, no TCP three-way handshake is required to exploit this vulnerability, and the malicious request could contain a spoofed origin. The attacker must know the configured community strings for SNMP version 1 and version 2. Exploitation also requires a valid username and password when a device is configured for SNMP version 3.

Cisco has confirmed the vulnerability in a security advisory and has released updated software.
 
Warning Indicators
Cisco NX-OS 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 devices in a security advisory. The Vendor Announcements section of this alert contains a link to the advisory.
 
IntelliShield Analysis
To exploit this vulnerability, an attacker must be able to authenticate to a targeted device. In addition, SNMP must be enabled and explicitly configured by an administrator. SNMP is disabled by default. These requirements reduce the likelihood of a successful attack.

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 ID CSCtx54822 at the following link: cisco-sa-20130424-nxosmulti
 
Impact
An authenticated, remote attacker could exploit this vulnerability to execute arbitrary code with elevated privileges on a targeted device. Successful exploitation could result in a complete system compromise.
 
Technical Information
The vulnerability is due to insufficient validation of user-supplied input processed by the SNMP subsystem implemented in the affected software. The vulnerability can be triggered via SNMP over IPv4 and IPv6.

An authenticated, remote attacker could exploit this vulnerability by submitting a malicious SNMP query via UDP port 161 to the targeted device. If successful, the query could trigger a buffer overflow condition in the SNMP component of the affected device. An attacker could use the buffer overflow condition to execute arbitrary code with elevated privileges.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only privileged users to access administration or management systems.

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 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), 6.0(1), 6.0(2), 6.0(3), 6.0(4)
CiscoCisco MDS 9000 NX-OS Software 4.1 Base, (1b), (1c), (3a) | 4.2 Base, (1a), (1b), (3), (3a), (5), (7a), (7b), (7d), (7e) | 5.0 Base, (1a), (4), (4b), (4c), (4d), (7) | 5.2 Base, (1), (2), (2a), (2d)

Associated Products:
N/A




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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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