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Category:   Device (Router/Bridge/Hub)  >   Cisco NX-OS Vendors:   Cisco
Cisco NX-OS DHCPv4 Input Validation Flaw Lets Remote Users Cause the Target Service to Crash
SecurityTracker Alert ID:  1036948
SecurityTracker URL:  http://securitytracker.com/id/1036948
CVE Reference:   CVE-2015-6392   (Links to External Site)
Date:  Oct 5 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Cisco NX-OS. A remote user can cause the target service to crash.

A remote user can send specially crafted DHCPv4 offer packets to the target device via IPv4 to cause the target DHCP service or the target device to crash.

Systems running a DHCP relay agent or smart relay agent listening on the device using the IPv4 broadcast address or the IPv4 unicast address of any interface configured on the device are affected.

The following products are affected:

Nexus 2000 Series Fabric Extenders
Nexus 5000 Series Switches
Nexus 5500 Platform Switches
Nexus 5600 Platform Switches
Nexus 6000 Series Switches
Nexus 7000 Series Switches
Nexus 7700 Series Switches
Nexus 9000 Series Switches in Application Centric Infrastructure (ACI) mode
Nexus 9000 Series Switches in NX-OS mode

The vendor has assigned bug IDs CSCuq24603, CSCur93159, CSCus21693, and CSCut76171 to this vulnerability.

Impact:   A remote user can cause the target service or device to crash.
Solution:   The vendor has issued a fix.

A patch matrix is available in the vendor advisory.

The vendor advisory is available at:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161005-dhcp1

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161005-dhcp1 (Links to External Site)
Cause:   Input validation error

Message History:   None.


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