cisco-sa-20180711-staros-dos: Cisco StarOS IPv4 Fragmentation Denial of Service Vulnerability
First published: Wed Jul 11 2018(Updated: )
A vulnerability in the reassembly logic for fragmented IPv4 packets of Cisco StarOS running on virtual platforms could allow an unauthenticated, remote attacker to trigger a reload of the npusim process, resulting in a denial of service (DoS) condition. There are four instances of the npusim process running per Service Function (SF) instance, each handling a subset of all traffic flowing across the device. It is possible to trigger a reload of all four instances of the npusim process around the same time. The vulnerability is due to improper handling of fragmented IPv4 packets containing options. An attacker could exploit this vulnerability by sending a malicious IPv4 packet across an affected device. An exploit could allow the attacker to trigger a restart of the npusim process, which will result in all traffic queued toward this instance of the npusim process to be dropped while the process is restarting. The npusim process typically restarts within less than a second. 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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180711-staros-dos
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco StarOS | =21.6<21.6.4=21.5<21.5.7=21.4<Migrate to 21.5.7=21.3<21.3.15=N5.1 (21.1)<N5.1.11 (21.6.5)=N5.0 (21.0)<Migrate to N5.1.11 (21.6.5) | 21.6.4 21.5.7 Migrate to 21.5.7 21.3.15 N5.1.11 (21.6.5) Migrate to N5.1.11 (21.6.5) |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID for this Cisco StarOS vulnerability?
The vulnerability ID for this Cisco StarOS vulnerability is cisco-sa-20180711-staros-dos.
What is the severity rating of the Cisco StarOS IPv4 Fragmentation Denial of Service vulnerability?
The severity rating of the Cisco StarOS IPv4 Fragmentation Denial of Service vulnerability is 8.6 out of 10.
What is the vulnerability description of cisco-sa-20180711-staros-dos?
The vulnerability cisco-sa-20180711-staros-dos is a denial of service (DoS) vulnerability in the reassembly logic for fragmented IPv4 packets of Cisco StarOS running on virtual platforms.
How can this vulnerability be fixed?
To fix this vulnerability, users should upgrade their Cisco StarOS software to version 21.6.4, 21.5.7, or migrate to N5.1.11 (21.6.5).
Where can I find more information about this vulnerability?
More information about this vulnerability can be found at the following reference link: [Cisco Security Advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180711-staros-dos).
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