cisco-sa-20180620-nxossnmp: Cisco NX-OS Software Authenticated Simple Network Management Protocol Denial of Service Vulnerability
First published: Wed Jun 20 2018(Updated: )
A vulnerability in the Simple Network Management Protocol (SNMP) input packet processor of Cisco NX-OS Software could allow an authenticated, remote attacker to cause the SNMP application on an affected device to restart unexpectedly. The vulnerability is due to improper validation of SNMP protocol data units (PDUs) in SNMP packets. An attacker could exploit this vulnerability by sending a crafted SNMP packet to an affected device. A successful exploit could allow the attacker to cause the SNMP application to restart multiple times, leading to a system-level restart and a denial of service (DoS) condition. 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-20180620-nxossnmp This advisory is part of the June 2018 Cisco FXOS and NX-OS Software Security Advisory Collection, which includes 24 Cisco Security Advisories that describe 24 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: June 2018 Cisco FXOS and NX-OS Software Security Advisory Collection.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco NX-OS | ||
| Cisco NX-OS | =6.2<6.2(20a) | 6.2(20a) |
| Cisco NX-OS | =3.2<3.2(3h)=3.1<3.1(3l)=3.0<3.1(3l)=2.5<3.1(3l)=2.2<2.2(8m)=Prior to 2.2<2.2(8m) | 3.2(3h) 3.1(3l) 3.1(3l) 3.1(3l) 2.2(8m) 2.2(8m) |
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Reference Links
Frequently Asked Questions
What is the severity of cisco-sa-20180620-nxossnmp?
The severity of cisco-sa-20180620-nxossnmp is classified as medium.
How do I fix cisco-sa-20180620-nxossnmp?
To fix cisco-sa-20180620-nxossnmp, upgrade to the recommended versions specified in the advisory.
Who is affected by cisco-sa-20180620-nxossnmp?
Cisco devices running vulnerable versions of NX-OS Software are affected by cisco-sa-20180620-nxossnmp.
What type of attack does cisco-sa-20180620-nxossnmp address?
cisco-sa-20180620-nxossnmp addresses remote authenticated attacks that cause the SNMP application to restart unexpectedly.
What is the cause of cisco-sa-20180620-nxossnmp?
The cause of cisco-sa-20180620-nxossnmp is improper validation in the SNMP input packet processor.
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