Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
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
===========================================================================
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
- --------------------------BEGIN INCLUDED TEXT--------------------
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--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/render.html?cid=1980
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=7J6T
-----END PGP SIGNATURE-----