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Cisco has issued a software update to address a vulnerability in its Cisco REST API virtual service container for Cisco IOS XE software that scored a critical 10 out of 10 on the Common Vulnerability Scoring System (CVSS) system.

With the vulnerability an attacker could submit malicious HTTP requests to the targeted device and if successful, obtain the token-id of an authenticated user.

This token-id could be used to bypass authentication and execute privileged actions through the interface of the REST API virtual service container on the affected Cisco IOS XE device, the company said.

According to Cisco the REST API is an application that runs in a virtual services container. A virtual services container is a virtualised environment on a device and is delivered as an open virtual application (OVA). The OVA package has to be installed and enabled on a device through the device virtualisation manager (VMAN) CLI.

The Cisco REST API provides a set of RESTful APIs as an alternative method to the Cisco IOS XE CLI to provision selected functions on Cisco devices.

Cisco said the vulnerability can be exploited under the following conditions:

  • The device runs an affected Cisco IOS XE Software release
  • The device has installed and enabled an affected version of the Cisco REST API virtual service container
  • An authorised user with administrator credentials (level 15) is authenticated to the REST API interface





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