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AUSCERT External Security Bulletin Redistribution
ESB-2017.0899
Cisco Aironet 1830 Series and 1850 Series Access Points
Mobility Express Default Credential Vulnerability
6 April 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Aironet 1830 Series and Cisco Aironet 1850 Series
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-3834
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170405-ame
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Cisco Security Advisory
Cisco Aironet 1830 Series and 1850 Series Access Points Mobility Express
Default Credential Vulnerability
Critical
Advisory ID:
cisco-sa-20170405-ame
First Published:
2017 April 5 16:00 GMT
Version 1.0:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCva50691
CVE-2017-3834
CWE-255
CVSS Score:
Base 9.8, Temporal 9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
CVE-2017-3834
CWE-255
Summary
A vulnerability in Cisco Aironet 1830 Series and Cisco Aironet 1850 Series
Access Points running Cisco Mobility Express Software could allow an
unauthenticated, remote attacker to take complete control of an affected
device.
The vulnerability is due to the existence of default credentials for an
affected device that is running Cisco Mobility Express Software, regardless
of whether the device is configured as a master, subordinate, or standalone
access point. An attacker who has layer 3 connectivity to an affected
device could use Secure Shell (SSH) to log in to the device with elevated
privileges. A successful exploit could allow the attacker to take complete
control of the device.
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:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170405-ame
Affected Products
Vulnerable Products
This vulnerability affects Cisco Aironet 1830 Series and Cisco Aironet 1850
Series Access Points that are running an 8.2.x release of Cisco Mobility
Express Software prior to Release 8.2.111.0, regardless of whether the
device is configured as a master, subordinate, or standalone access point.
Release 8.2 was the first release of Cisco Mobility Express Software for
next generation Cisco Aironet Access Points.
To determine which release of Cisco Mobility Express Software is running on
a device, administrators can use the Cisco Mobility Express wireless
controller web interface or the CLI.
To use the web interface, log in to the web interface, choose Management >
Software Update, and then refer to the release number that appears at the
top of the page.
To use the CLI, issue the show version command, and then refer to the
output of the command. The following example shows the output of the
command for a Cisco Aironet 1852i Access Point that is running
Cisco Mobility Express Software Release 8.3.111.0:
AP# show version
cisco AIR-AP1852I-UXK9 ARMv7 Processor rev 0 (v71) with 997184/525160K bytes of memory.
Processor board ID RFDP2BCR021
AP Running Image : 8.3.111.0
Primary Boot Image : 8.3.111.0
Backup Boot Image : 8.1.106.33
AP Image type : MOBILITY EXPRESS IMAGE
AP Configuration : MOBILITY EXPRESS CAPABLE
.
.
.
The device is not affected by this vulnerability.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco Aironet
Access Points running Cisco Lightweight Access Point (AP) Software or
Cisco IOS Software.
Cisco has also confirmed that this vulnerability does not affect the
following Cisco products:
Aironet 2800 Series Access Points running Cisco Mobility Express
Software
Aironet 3800 Series Access Points running Cisco Mobility Express
Software
Wireless controllers, any Cisco model
Wireless LAN controllers, any Cisco model
Workarounds
There are no workarounds that address this vulnerability.
Fixed Software
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
software license:
http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html
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 upgrade 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
providers.
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:
http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html
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
upgrade.
Fixed Releases
Customers should upgrade to an appropriate release as indicated in the
table in this section. To help ensure a complete upgrade solution, consider
that this advisory is part of a collection that includes the following
advisories:
cisco-sa-20170405-ame: Cisco Aironet 1830 Series and 1850 Series Access
Points Mobility Express Default Credential Vulnerability
cisco-sa-20170405-wlc: Cisco Wireless LAN Controller 802.11 WME Denial
of Service Vulnerability
cisco-sa-20170405-wlc2: Cisco Wireless LAN Controller IPv6 UDP Denial
of Service Vulnerability
cisco-sa-20170405-wlc3: Cisco Wireless LAN Controller Management GUI
Denial of Service Vulnerability
In the following table, the left column lists major releases of Cisco
software. The center column indicates whether a major release is affected
by the vulnerability described in this advisory and the first minor release
that includes the fix for this vulnerability. The right column indicates
whether a major release is affected by all the vulnerabilities described in
this collection of advisories and the current recommended release for those
vulnerabilities.
Cisco Mobility First Fixed First Fixed Release for All
Express Software Release for This Vulnerabilities Described in the
Major Release Vulnerability Collection of Advisories
Prior to 8.0 Not vulnerable 8.0.140.0
8.0 Not vulnerable 8.0.140.0
8.1 Not vulnerable 8.2.130.0
8.2 8.2.111.0 8.2.141.0
8.3 Not vulnerable 8.3.112.0
8.4 Not vulnerable 8.4.100.0 (future release)
Exploitation and Public Announcements
The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
This issue was discovered by the Cisco TAC during the resolution of a
customer support case.
Cisco Security Vulnerability Policy
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.
URL
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170405-ame
Revision History
Version Description Section Status Date
1.0 Initial public release. Final 2017-April-05
Legal Disclaimer
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.
Cisco Security Vulnerability Policy
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.
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