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Category:   Device (Router/Bridge/Hub)  >   Cisco ASR Router Vendors:   Cisco
Cisco ASR 5700 Series Router StarOS Packet Length Validation Bug Lets Remote Users Deny Service
SecurityTracker Alert ID:  1040720
SecurityTracker URL:  http://securitytracker.com/id/1040720
CVE Reference:   CVE-2018-0239   (Links to External Site)
Date:  Apr 19 2018
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5700 Series
Description:   A vulnerability was reported in StarOS on Cisco ASR 5700 Series Routers. A remote user can cause denial of service conditions on the target system.

The StarOS egress packet processing does not properly check that the length of packets to be transmitted do not exceed the network card's maximum supported packet length. A remote user can send a specially crafted IP packet or series of specially crafted IP fragments through an interface on the targeted device to cause the network interface to stop forwarding packets.

A manual restart is required to return the system to normal operations.

The vendor has assigned bug ID CSCvf32385 to this vulnerability.

Impact:   A remote user can cause the target interface to stop forwarding packets. A manual restart is required to return the system to normal operations.
Solution:   The vendor has issued a fix (N5.0.4 (21.0.v4), N5.1.9 (21.1.v7), N5.5.0 (21.3.v10)).

The vendor advisory is available at:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-staros

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-staros (Links to External Site)
Cause:   Input validation error

Message History:   None.


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