cisco-sa-snmp-7MKrW7Nq: Cisco IOS XR Software SNMP Management Plane Protection ACL Bypass Vulnerability
First published: Wed Feb 03 2021(Updated: )
A vulnerability in the Local Packet Transport Services (LPTS) programming of the SNMP with the management plane protection feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to allow connections despite the management plane protection that is configured to deny access to the SNMP server of an affected device. This vulnerability is due to incorrect LPTS programming when using SNMP with management plane protection. An attacker could exploit this vulnerability by connecting to an affected device using SNMP. A successful exploit could allow the attacker to connect to the device on the configured SNMP ports. Valid credentials are required to execute any of the SNMP requests. 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-snmp-7MKrW7Nq
Credit: This vulnerability was found during the resolution a Cisco TAC support case
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XR Software | =6.6.3<NCS5500=CRS-PX<hfr-px-6.4.2.CSCvt93184=6.4.2<ASR9K-PX | NCS5500 hfr-px-6.4.2.CSCvt93184 ASR9K-PX |
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Reference Links
Frequently Asked Questions
What is the Cisco IOS XR Software SNMP Management Plane Protection ACL Bypass Vulnerability?
It is a vulnerability in the Local Packet Transport Services (LPTS) programming of the SNMP with the management plane protection feature of Cisco IOS XR Software that allows an unauthenticated, remote attacker to bypass access restrictions.
What is the severity of the Cisco IOS XR Software SNMP Management Plane Protection ACL Bypass Vulnerability?
The severity of this vulnerability is medium with a CVSS score of 5.3.
Which Cisco products and software versions are affected by the Cisco IOS XR Software SNMP Management Plane Protection ACL Bypass Vulnerability?
The affected products include Cisco IOS XR Software versions 6.6.3, 6.4.2, NCS5500, CRS-PX, hfr-px-6.4.2.CSCvt93184, and ASR9K-PX.
How can an attacker exploit the Cisco IOS XR Software SNMP Management Plane Protection ACL Bypass Vulnerability?
An attacker can exploit this vulnerability by sending malicious SNMP packets to the affected device, bypassing management plane protection ACLs.
Is there a remedy for the Cisco IOS XR Software SNMP Management Plane Protection ACL Bypass Vulnerability?
Yes, Cisco has provided remedies for the affected products. Please refer to the Cisco Security Advisory for more information.
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