Finding Cisco devices running IOS XE

(updated ), by Pearce Barry

Cisco recently disclosed a command execution vulnerability that affects some versions of IOS XE SD-WAN software running on Cisco routing devices and virtual instances. With a CVSSv3 score of 7.8, this vulnerability (assigned CVE-2021-1529) is due to inadequate input validation in the command line interface (CLI), allowing an authenticated attacker who provides crafted CLI input to execute commands with root privileges. This vulnerability follows a handful of SD-WAN vulns Cisco has addressed this year.

Along with the disclosure, Cisco announced updated software to address this vulnerability. However, it is only for universal IOS XE releases and not standalone Cisco IOS XE SD-WAN releases. And with no mitigations or workarounds offered, folks should update affected devices and virtual instances as soon as possible.

How to find Cisco devices running IOS XE with Rumble #

From the Services Inventory, use the following pre-built query to locate Cisco IOS XE instances exposing a CLI in your network:

_asset.protocol:snmp AND protocol:snmp AND snmp.sysDesc:"IOS-XE" AND (_asset.protocol:telnet or _asset.protocol:ssh)
Find Cisco devices running IOS XE

As always, any prebuilt queries we create are available from our Queries Library. Check out the library for other useful inventory queries.

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Pearce Barry
Written by Pearce Barry

Pearce Barry is a Director of Security Research at runZero. Barry joined runZero in June 2021, working on the Metasploit Project the four years prior. Now, Pearce leads research efforts at runZero, which includes creating and improving fingerprints, adding to protocols, enhancing scanning logic, and writing queries.

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