Summary:

Affected Products:
These vulnerabilities affect all releases of Cisco IOS and IOS XE Software prior to the first fixed release and they affect all versions of SNMP—Versions 1, 2c, and 3.
To determine if the IOS or IOS XE is affected by this vulnerability, use the Cisco Software Checker tool. Below is an example that shows version 15.6(2)T1 is affected by this vulnerability (SNMP Remote Code Execution) and that the first fix in the same IOS line is 15.6(3)M2.
Devices running affected IOS/IOS_XE versions and that are configured with any of the following MIBs are vulnerable:
- ADSL-LINE-MIB
- ALPS-MIB
- CISCO-ADSL-DMT-LINE-MIB
- CISCO-BSTUN-MIB
- CISCO-MAC-AUTH-BYPASS-MIB
- CISCO-SLB-EXT-MIB
- CISCO-VOICE-DNIS-MIB
- CISCO-VOICE-NUMBER-EXPANSION-
MIB - TN3270E-RT-MIB
To display a list of the MIBs that are registered and enabled on a device, administrators can issue the show snmp mib command in privileged EXEC mode.
Workaround:
Disable the above vulnerable MIBs. To do so, administrators can use the snmp-server view global configuration command, as shown in the following example:
snmp-server view NO_BAD_SNMP iso included
snmp-server view NO_BAD_SNMP internet included
snmp-server view NO_BAD_SNMP snmpUsmMIB excluded
snmp-server view NO_BAD_SNMP snmpVacmMIB excluded
snmp-server view NO_BAD_SNMP snmpCommunityMIB excluded
snmp-server view NO_BAD_SNMP ciscoMgmt.252 excluded
snmp-server view NO_BAD_SNMP transmission.94 excluded
snmp-server view NO_BAD_SNMP mib-2.34.9 excluded
snmp-server view NO_BAD_SNMP ciscoMgmt.35 excluded
snmp-server view NO_BAD_SNMP ciscoMgmt.95 excluded
snmp-server view NO_BAD_SNMP ciscoMgmt.130 excluded
snmp-server view NO_BAD_SNMP ciscoMgmt.219 excluded
snmp-server view NO_BAD_SNMP ciscoMgmt.254 excluded
snmp-server view NO_BAD_SNMP ciscoMabMIB excluded
snmp-server view NO_BAD_SNMP ciscoExperiment.997 excluded
To then apply this configuration to a community string, administrators can use the following command:
snmp-server community mycomm view NO_BAD_SNMP RO
For SNMP Version 3, administrators can use the following command:
snmp-server group v3group auth read NO_BAD_SNMP write NO_BAD_SNMP
Further Info & Assistance:
This advisory is available at the following link:
Reference CVEs:
CVE-2017-6736
CVE-2017-6737
CVE-2017-6738
CVE-2017-6739
CVE-2017-6740
CVE-2017-6741
CVE-2017-6742
CVE-2017-6743
CVE-2017-6744
36 comments
Write commentsDoes disabling these SNMP MIBS cause any issues in existing SNMP operation ?
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