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Vulnerability Alert

Multiple Cisco Discovery Protocol Vulnerabilities in Cisco NX-OS-Based Products

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:29021
Version:1
First Published:2013 April 24 16:14 GMT
Last Published:2013 April 24 16:14 GMT
Port: Not available
CVE:CVE-2013-1178
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:8.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.9
Related Resources:
View related Security Advisory
 
 
Version Summary:Cisco NX-OS-based products contain multiple buffer overflow vulnerabilities that could allow an unauthenticated, adjacent attacker to execute arbitrary code with elevated privileges. Updates are available.
 
 
Description
Cisco NX-OS based products contain a buffer overflow vulnerability within the Cisco Discovery Protocol (CDP) subsystem. This could allow an unauthenticated, adjacent attacker with the ability to send a malicious packet to the affected device to trigger a buffer overflow condition. This could potentially lead to the ability of the attacker to execute arbitrary code with elevated privileges.

Cisco confirmed these vulnerabilities in a security advisory and released software updates.
 
Warning Indicators
Cisco NX-OS-based devices running an affected version of Cisco NX-OS Software are affected.

Cisco has published a list of affected Cisco NX-OS Software releases and affected Cisco NX-OS-based products in the security advisory. The "Vendor Announcements" section of this alert contains a link to the advisory.
 
IntelliShield Analysis
Because CDP works at the data link layer (Layer 2), an attacker must be able to submit an Ethernet frame directly, requiring an attacker to have access to a trusted, internal network to exploit this vulnerability. This access requirement reduces 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 IDs CSCtu10630, CSCtu10551, CSCtu10550, CSCtw56581, CSCtu10548, CSCtu10544, and CSCuf61275 at the following link: cisco-sa-20130424-nxosmulti
 
Impact
An unauthenticated, adjacent attacker could exploit these vulnerabilities to execute arbitrary code with elevated privileges.
 
Technical Information
The vulnerabilities are due to insufficient validation of user-supplied input processed by the CDP subsystem in the affected software.

An unauthenticated, adjacent attacker could exploit these vulnerabilities by submitting malformed CDP packets to an affected device. Processing the malformed packets could cause a buffer overflow condition that the attacker could use to execute arbitrary code with elevated privileges on the device.
 
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 1000 Series Base, 4.0(4)SV1(1), 4.0(4)SV1(2), 4.0(4)SV1(3), 4.0(4)SV1(3a), 4.0(4)SV1(3b), 4.0(4)SV1(3c), 4.0(4)SV1(3d), 4.2(1)SV1(4), 4.2(1)SV1(4a), 4.2(1)SV1(4b) | 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) | for Nexus 4000 Series Base, 4.1(2)E1(1), 4.1(2)E1(1b), 4.1(2)E1(1d), 4.1(2)E1(1e), 4.1(2)E1(1f), 4.1(2)E1(1g) | 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), 5.0(3)N2(2), 5.0(3)N2(2a), 5.0(3)N2(2b) | 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), 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)
CiscoCisco Unified Computing System (Managed) 1.0 Base, (2k) | 1.1 Base, (1m) | 1.2 Base, (1d) | 1.3 Base, (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), (1w), (1x)
CiscoCisco CG-OS CG1 (4), (5) | CG3 (1), (2), (3)

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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