cisco-sa-nxos-ipip-dos-kCT9X4: Cisco NX-OS Software Unexpected IP in IP Packet Processing Vulnerability
First published: Mon Jun 01 2020(Updated: )
A vulnerability in the network stack of Cisco NX-OS Software could allow an unauthenticated, remote attacker to bypass certain security boundaries or cause a denial of service (DoS) condition on an affected device. The vulnerability is due to the affected device unexpectedly decapsulating and processing IP in IP packets that are destined to a locally configured IP address. An attacker could exploit this vulnerability by sending a crafted IP in IP packet to an affected device. A successful exploit could cause the affected device to unexpectedly decapsulate the IP in IP packet and forward the inner IP packet. This may result in IP packets bypassing input access control lists (ACLs) configured on the affected device or other security boundaries defined elsewhere in the network. Under certain conditions, an exploit could cause the network stack process to crash and restart multiple times, leading to a reload of the affected device and a DoS condition. Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ipip-dos-kCT9X4
Credit: Yannay Livneh.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco UCS Software | =4.1<4.1(1d) (June 2020)=4.0<4.0(4i) (June 2020)=3.2<3.2(3o)=Earlier than 3.2<3.2(3o) | 4.1(1d) (June 2020) 4.0(4i) (June 2020) 3.2(3o) 3.2(3o) |
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Reference Links
Frequently Asked Questions
What is Cisco SA-NXOS-IPIP-DOS-KCT9X4?
Cisco SA-NXOS-IPIP-DOS-KCT9X4 is a vulnerability in the network stack of Cisco NX-OS Software that could allow an unauthenticated, remote attacker to bypass certain security boundaries or cause a denial of service (DoS) condition on an affected device.
How severe is the Cisco SA-NXOS-IPIP-DOS-KCT9X4 vulnerability?
The severity of the Cisco SA-NXOS-IPIP-DOS-KCT9X4 vulnerability is high, with a CVSS score of 8.6.
What is the affected software for Cisco SA-NXOS-IPIP-DOS-KCT9X4?
The affected software for Cisco SA-NXOS-IPIP-DOS-KCT9X4 is Cisco NX-OS Software version 4.1(1d) (June 2020), 4.0(4i) (June 2020), 3.2(3o), and earlier versions.
How can an attacker exploit the Cisco SA-NXOS-IPIP-DOS-KCT9X4 vulnerability?
An unauthenticated, remote attacker can exploit the Cisco SA-NXOS-IPIP-DOS-KCT9X4 vulnerability by sending specially crafted IP in IP packets to an affected device.
Is there a fix available for the Cisco SA-NXOS-IPIP-DOS-KCT9X4 vulnerability?
Yes, Cisco has released software updates to address the Cisco SA-NXOS-IPIP-DOS-KCT9X4 vulnerability. It is recommended to upgrade to the fixed software versions as mentioned in the Cisco Security Advisory.
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