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                              CERT-Renater

                 Note d'Information No. 2017/VULN191
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DATE                : 21/06/2017

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Cisco Virtualized Packet
                           Core-Distributed Instance.

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https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170621-vpc
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Cisco Security Advisory: Cisco Virtualized Packet Core Distributed
Instance Denial of Service Vulnerability

Advisory ID: cisco-sa-20170621-vpc

Revision: 1.0

For Public Release: 2017 June 21 16:00 GMT

Last Updated: 2017 June 21 16:00 GMT

CVE ID(s): CVE-2017-6678

CVSS Score v(3): 8.6 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

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Summary
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A vulnerability in the ingress UDP packet processing functionality of
Cisco Virtualized Packet Core-Distributed Instance (VPC-DI) Software
could allow an unauthenticated, remote attacker to cause both control
function (CF) instances on an affected system to reload, resulting in a
denial of service (DoS) condition.

The vulnerability is due to insufficient handling of user-supplied data
by the affected software. An attacker could exploit this vulnerability
by sending crafted UDP packets to the distributed instance (DI) network
addresses of both CF instances on an affected system. A successful
exploit could allow the attacker to cause an unhandled error condition
on the affected system, which would cause the CF instances to reload
and consequently cause the entire VPC to reload, resulting in the
disconnection of all subscribers and a DoS condition on the affected
system.

This vulnerability can be exploited via IPv4 traffic only.

Cisco has released software updates that address this vulnerability.
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-20170621-vpc
["https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170621-vpc"]

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+ CERT-RENATER          | tel : 01-53-94-20-44           +
+ 23 - 25 Rue Daviel    | fax : 01-53-94-20-41           +
+ 75013 Paris           | email: cert@support.renater.fr +
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