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ESB-2016.0677 - [Cisco] Cisco Gigabit Switch Router 12000 Series Routers: Denial of service - Remote/unauthenticated

Date: 14 March 2016

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0677
        Cisco Gigabit Switch Router 12000 Series Routers Denial of
                           Service Vulnerability
                               14 March 2016

===========================================================================

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

Product:           Cisco Gigabit Switch Router 12000 Series Routers
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-1361  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160311-gsr

- --------------------------BEGIN INCLUDED TEXT--------------------

Cisco Security Advisory

Cisco Gigabit Switch Router 12000 Series Routers Denial of Service 
Vulnerability

Medium

Advisory ID:

cisco-sa-20160311-gsr

Published:

2016 March 11 14:49 GMT

Version 1.0:

Final

CVSS Score:

Base - 4.6

Workarounds:

Yes

Cisco Bug IDs:

CSCuv17791

CSCuw56900

CVE-2016-1361

CWE-399

Summary

A vulnerability in the ASIC UDP ingress receive function of Cisco Gigabit
Switch Router (GSR) 12000 Series Routers could allow an unauthenticated, 
remote attacker to cause a partial denial of service (DoS) condition when one
line card in the router unexpectedly restarts.

The vulnerability is due to improper input validation for the presence of
a Bidirectional Forwarding Detection (BFD) header on the UDP packet. An 
attacker could exploit this vulnerability by sending a crafted UDP packet with
a specific UDP port range to the affected device. An exploit could allow the 
attacker to cause a partial denial of service condition when a line card 
unexpectedly restarts.

Cisco has released software updates that address this vulnerability. 
Workarounds that address this vulnerability are available.

This advisory is available at the following link: 
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160311-gsr

Affected Products

    Vulnerable Products

All releases of Cisco IOS XR for Cisco GSR 12000 Series Routers are 
vulnerable.

    Products Confirmed Not Vulnerable

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

Workarounds

An access-control list (ACL) can be applied to the incoming interface to 
block the offending packets.

Fixed Software

Information about fixed software is documented in the 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-20160311-gsr

Revision History

    Version 	Description 		Section 	Status 	Date

    1.0 	Initial public release. 		Final 	2016-March-11

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.

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

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===========================================================================
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.
===========================================================================
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