CVE-2018-0369: Input Validation
First published: Mon Jul 16 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. This vulnerability affects: Cisco Virtualized Packet Core-Single Instance (VPC-SI), Cisco Virtualized Packet Core-Distributed Instance (VPC-DI), Cisco Ultra Packet Core (UPC). Cisco Bug IDs: CSCvh29613.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco StarOS | >=21.3<21.3.15 | |
| Cisco StarOS | >=21.4<21.5.7 | |
| Cisco StarOS | >=21.6<21.6.4 | |
| Cisco ASR 5000 | ||
| Cisco ASR 5500 | ||
| Cisco Asr 5700 |
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Reference Links
Frequently Asked Questions
What is CVE-2018-0369?
CVE-2018-0369 is a vulnerability in the reassembly logic for fragmented IPv4 packets of Cisco StarOS running on virtual platforms.
How can an attacker exploit CVE-2018-0369?
An unauthenticated, remote attacker can exploit CVE-2018-0369 by triggering a reload of the npusim process, resulting in a denial of service (DoS) condition.
Which software versions are affected by CVE-2018-0369?
Cisco StarOS versions between 21.3 and 21.3.15, between 21.4 and 21.5.7, and between 21.6 and 21.6.4 are affected by CVE-2018-0369.
Is Cisco ASR 5000 affected by CVE-2018-0369?
No, Cisco ASR 5000 is not affected by CVE-2018-0369.
Is Cisco ASR 5500 affected by CVE-2018-0369?
No, Cisco ASR 5500 is not affected by CVE-2018-0369.
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