ESB-2017.2504 - [Cisco] Cisco Network Convergence System 5500 Series: Denial of service - Remote/unauthenticated 2017-10-05

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2504
           Cisco IOS XR Software Denial of Service Vulnerability
                              5 October 2017

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

Product:           Cisco Network Convergence System 5500 Series
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-12270  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171004-ncs

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Cisco IOS XR Software Denial of Service Vulnerability

Medium

Advisory ID:
cisco-sa-20171004-ncs

First Published:
2017 October 4 16:00 GMT

Version 1.0:
Final

Workarounds:
No workarounds available 

Cisco Bug IDs:
CSCvb99388

CVSS Score:
Base 5.3

CVE-2017-12270
CWE-119

Summary

A vulnerability in the gRPC code of Cisco IOS XR Software for Cisco Network 
Convergence System (NCS) 5500 Series Routers could allow an unauthenticated, 
remote attacker to cause a denial of service (DoS) condition when the emsd 
service stops.

The vulnerability is due to the software's inability to process HTTP/2 
packets. An attacker could exploit this vulnerability by sending a malformed 
HTTP/2 frame to the affected device. A successful exploit could allow the 
attacker to create a DoS condition when the emsd service stops.

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-20171004-ncs

Affected Products

Vulnerable Products

This vulnerability affects Cisco Network Convergence System (NCS) 5500 Series
Routers that are running Cisco IOS XR Software with gRPC enabled.

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.

Source

This vulnerability was found during internal testing.

URL

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171004-ncs

Revision History

Version	Description 		Section 	Status  Date
1.0 	Initial public release. -		Final   2017-October-04

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