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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.0155
  Cisco Nexus 5000, 6000, and 7000 Series Switches Software IS-IS Packet
                Processing Denial of Service Vulnerability
                              19 January 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco Nexus 5000 Series Switches
                   Cisco Nexus 6000 Series Switches
                   Cisco Nexus 7000 Series Switches
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-3804  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170118-nexus

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Cisco Security Advisory

Cisco Nexus 5000, 6000, and 7000 Series Switches Software IS-IS Packet
Processing Denial of Service Vulnerability

Medium
Advisory ID:
cisco-sa-20170118-nexus
First Published:
2017 January 18 16:00  GMT
Version 1.0:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCvc45002
CVE-2017-3804
CWE-399
CVSS Score:
Base 5.8, Temporal 5.8
CVSS:3.0/AV:A/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
CVE-2017-3804
CWE-399


Summary

    A vulnerability in Intermediate System-to-Intermediate System (IS-IS)
    protocol packet processing of Cisco Nexus 5000, 6000, and 7000 Series
    Switches software could allow an unauthenticated, adjacent attacker to
    cause a reload of the affected device.

    The vulnerability is due to improper processing of crafted IS-IS protocol
    packets. An attacker could exploit this vulnerability by sending a crafted
    IS-IS protocol packet over an established adjacency. An exploit could allow
    the attacker to cause a reload of the affected device.

    There are no workarounds that address this vulnerability.

    This advisory is available at the following link:
    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170118-nexus

Affected Products

    Vulnerable Products

    Cisco Nexus 5000, 6000, and 7000 Series Switches are affected. Switches in
    the FabricPath domain crash because of an __inst_001__isis_fabricpath hap
    reset when processing a crafted link-state packet.

    For information about affected software releases, consult the Cisco bug ID
    (s) at the top of this advisory.

    Products Confirmed Not Vulnerable

    No other Cisco products are currently known to be affected by this
    vulnerability.

Workarounds

    There are no workarounds that address this vulnerability.

Fixed Software

    For information about fixed software releases, consult the Cisco bug ID(s)
    at the top of this advisory.

    When considering software upgrades, customers are advised to regularly
    consult the advisories for Cisco products, which are available from the
    Cisco Security Advisories and Alerts page, 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.

Cisco Security Vulnerability Policy

    To learn about Cisco security vulnerability disclosure policies and
    publications, see the Security Vulnerability Policy. This document also
    contains instructions for obtaining fixed software and receiving security
    vulnerability information from Cisco.

URL

    https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170118-nexus

Revision History

     Version          Description         Section   Status        Date       
    
     1.0       Initial public release.             Final   2017-January-18  

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.

Cisco Security Vulnerability Policy

    To learn about Cisco security vulnerability disclosure policies and
    publications, see the Security Vulnerability Policy. This document also
    contains instructions for obtaining fixed software and receiving security
    vulnerability information from Cisco.

- --------------------------END INCLUDED TEXT--------------------

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