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AUSCERT External Security Bulletin Redistribution
ESB-2016.1839
Cisco Nexus 1000v Application Virtual Switch Cisco Discovery Protocol
Packet Processing Denial of Service Vulnerability
28 July 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Nexus 1000v Application Virtual Switch
Publisher: Cisco Systems
Operating System: Cisco
Virtualisation
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-1465
Original Bulletin:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160727-avs
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Cisco Security Advisory
Cisco Nexus 1000v Application Virtual Switch Cisco Discovery Protocol Packet
Processing Denial of Service Vulnerability
Medium
Advisory ID: cisco-sa-20160727-avs
Published:
2016 July 27 16:00 GMT
Version 1.0:
Final
CVSS Score:
Base - 6.1
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCuw57985
CVE-2016-1465
CWE-399
Summary
A vulnerability in Cisco Discovery Protocol packet processing for the Cisco
Nexus 1000v Application Virtual Switch (AVS) could allow an unauthenticated,
remote attacker to cause the ESXi hypervisor to crash and display a purple
diagnostic screen, resulting in a denial of service (DoS) condition.
The vulnerability is due to insufficient input validation of Cisco Discovery
Protocol packets, which could result in a crash of the ESXi hypervisor due to
an out-of-bound memory access. An attacker could exploit this vulnerability by
sending a crafted Cisco Discovery Protocol packet to a targeted device. An
exploit could allow the attacker to cause a DoS condition.
Cisco has released software updates that address this vulnerability.
Workarounds that address this vulnerability are not available.
This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160727-avs
Affected Products
Vulnerable Products
Cisco Nexus 1000v AVS versions prior to 5.2(1)SV3(1.5i) and prior to
5.2(1)SV3(1.6) are vulnerable.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Indicators of Compromise
The ESXi hypervisor can crash with a purple diagnostic screen. The
administrator can look for the core files using the show cores command.
Workarounds
Workarounds that address this vulnerability are not available.
Fixed Software
Cisco provides information about fixed software in Cisco bugs, which are
accessible through the Cisco Bug Search Tool.
When considering software upgrades, customers are advised to consult the Cisco
Security Advisories and Responses 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.
Exploitation and Public Announcements
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any
public announcements or malicious use of the vulnerability that is described
in this advisory.
URL
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160727-avs
Revision History
Version Description Section Status Date
1.0 Initial public release. - Final 2016-July-27
Legal Disclaimer
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 standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information or
contain factual errors. The information in this document is intended for end
users of Cisco products.
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