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AUSCERT External Security Bulletin Redistribution
Cisco IOS XE Software Web UI Command Injection Vulnerability
14 May 2019
AusCERT Security Bulletin Summary
Product: Cisco IOS XE Software Web UI
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Existing Account
CVE Names: CVE-2019-1862
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Cisco IOS XE Software Web UI Command Injection Vulnerability
Advisory ID: cisco-sa-20190513-webui
First Published: 2019 May 13 17:30 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvn20358
o A vulnerability in the web-based user interface (Web UI) of Cisco IOS XE
Software could allow an authenticated, remote attacker to execute commands
on the underlying Linux shell of an affected device with root privileges.
The vulnerability occurs because the affected software improperly sanitizes
user-supplied input. An attacker who has valid administrator access to an
affected device could exploit this vulnerability by supplying a crafted
input parameter on a form in the Web UI and then submitting that form. A
successful exploit could allow the attacker to run arbitrary commands on
the device with root privileges, which may lead to complete system
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:
o Vulnerable Products
This vulnerability affects Cisco devices that are running an affected
release of Cisco IOS XE Software with the HTTP Server feature enabled. The
default state of the HTTP Server feature is version dependent.
For information about which Cisco IOS XE Software releases are vulnerable,
see the Fixed Software section of this advisory.
Assessing the HTTP Server Configuration
To determine whether the HTTP Server feature is enabled for a device,
administrators can log in to the device and use the show running-config |
include ip http server|secure-server command in the CLI to check for the
presence of the ip http server command or the ip http secure-server command
in the global configuration. If either command is present and configured,
the HTTP Server feature is enabled for the device.
The following example shows the output of the show running-config | include
ip http server|secure-server command for a router that has the HTTP Server
Router# show running-config | include ip http server|secure-server
ip http server
ip http secure-server
The presence of either command in the device's configuration indicates that
the HTTP Server feature is enabled.
Determining the Cisco IOS XE Software Release
To determine which Cisco IOS XE Software release is running on a device,
administrators can log in to the device, use the show version command in
the CLI, and then refer to the system banner that appears. If the device is
running Cisco IOS XE Software, the system banner displays Cisco IOS
Software , Cisco IOS XE Software , or similar text.
The following example shows the output of the command for a device that is
running Cisco IOS XE Software Release 16.2.1 and has an installed image
name of CAT3K_CAA-UNIVERSALK9-M :
ios-xe-device# show version
Cisco IOS Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version Denali 16.2.1, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2016 by Cisco Systems, Inc.
Compiled Sun 27-Mar-16 21:47 by mcpre
For information about the naming and numbering conventions for Cisco IOS XE
Software releases, see the Cisco IOS and NX-OS Software Reference Guide .
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco IOS
Software, Cisco IOS XR Software, or Cisco NX-OS Software.
o There are no workarounds that address this vulnerability.
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades, customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page , to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC:
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
Cisco IOS and IOS XE Software
To help customers determine their exposure to vulnerabilities in Cisco IOS
and IOS XE Software, Cisco provides a tool, the Cisco IOS Software Checker
, that identifies any Cisco Security Advisories that impact a specific
software release and the earliest release that fixes the vulnerabilities
described in each advisory ("First Fixed"). If applicable, the tool also
returns the earliest release that fixes all the vulnerabilities described
in all the advisories identified ("Combined First Fixed").
Customers can use this tool to perform the following tasks:
Initiate a search by choosing one or more releases from a drop-down
list or uploading a file from a local system for the tool to parse
Enter the output of the show version command for the tool to parse
Create a custom search by including all previously published Cisco
Security Advisories, a specific advisory, or all advisories in the most
recent bundled publication
To determine whether a release is affected by any published Cisco Security
Advisory, use the Cisco IOS Software Checker on Cisco.com or enter a Cisco
IOS or IOS XE Software release-for example, 15.1(4)M2 or 3.13.8S -in the
[ ] [Check]
By default, the Cisco IOS Software Checker includes results only for
vulnerabilities that have a Critical or High Security Impact Rating (SIR).
To include results for Medium SIR vulnerabilities, use the Cisco IOS
Software Checker on Cisco.com and check the Medium check box in the Impact
Rating drop-down list.
For a mapping of Cisco IOS XE Software releases to Cisco IOS Software
releases, refer to the Cisco IOS XE 2 Release Notes , Cisco IOS XE 3S
Release Notes , or Cisco IOS XE 3SG Release Notes , depending on the Cisco
IOS XE Software release.
Note: Starting with Cisco IOS XE Software Release 16.9.1, any upgrade will
require Smart Licensing. Customers who plan to upgrade Cisco IOS XE to
Release 16.9.1 or later are advised to consider the Smart Licensing
requirement. The following documentation provides additional information:
Smart Licensing .
Exploitation and Public Announcements
o This vulnerability was publicly disclosed by Red Balloon Security on May
The Cisco Product Security Incident Response Team (PSIRT) is aware of the
existence of exploit code that demonstrates this vulnerability on Cisco IOS
XE Software. There are no indications at this time that this exploit code
is publicly available.
Cisco PSIRT is not aware of any malicious use of the vulnerability that is
described in this advisory.
o Cisco would like to thank Mr. James Chambers (Security Researcher) of Red
Balloon Security for reporting this vulnerability to Cisco and working
toward a coordinated disclosure.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
| Version | Description | Section | Status | Date |
| 1.0 | Initial public release. | | Final | 2019-May-13 |
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