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AUSCERT External Security Bulletin Redistribution
ESB-2018.3150
Cisco Aironet 1560, 1800, 2800, and 3800 Series Access
Points Denial of Service Vulnerability
18 October 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Aironet
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-0381
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181017-aironet-dos
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Cisco Aironet 1560, 1800, 2800, and 3800 Series Access Points Denial of Service
Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20181017-aironet-dos
First Published: 2018 October 17 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvh21953
CVE-2018-0381
CWE-400
CVSSÂ Score:
5.8 AV:A/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the Cisco Aironet 1560, 1800, 2800, and 3800 Series
Access Points (APs) software could allow an authenticated, adjacent
attacker to cause an affected device to reload unexpectedly, resulting in
a denial of service (DoS) condition.
The vulnerability is due to a deadlock condition that may occur when an
affected AP attempts to dequeue aggregated traffic that is destined to an
attacker-controlled wireless client. An attacker who can successfully
transition between multiple Service Set Identifiers (SSIDs) hosted on the
same AP while replicating the required traffic patterns could trigger the
deadlock condition. A watchdog timer that detects the condition will
trigger a reload of the device, resulting in a DoS condition while the
device restarts.
Cisco has released software updates that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181017-aironet-dos
Affected Products
o Vulnerable Products
This vulnerability affects only Cisco 1560, 1800, 2800, and 3800 Series
Access Points that are running a vulnerable release of Cisco Mobility
Express (ME) Software. For information about affected software releases,
consult the Cisco bug ID(s) at the top of this advisory.
Determining the Cisco Mobility Express Software Release
To determine which Cisco Mobility Express Software release is running on a
device, administrators can use the web interface or the CLI of the device.
To use the web interface, do the following:
1. Log in to the web interface
2. Choose System Software > Software Upgrade
3. Refer to the value in the System Software Version field
To use the CLI, log in to the AP through a Telnet or an SSH session, issue
the show version command, and then refer to the command output. The
following example shows the command output 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
.
.
.
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 the following
Cisco products:
Small Business 100 Series Access Points
Small Business 300 Series Access Points
Small Business 500 Series Access Points
Aironet 1540 Series Access Points
Note: The Cisco Aironet 1550 Series Outdoor Access Point was not
investigated because it has entered the end-of-life process. Refer to the
End-of-Sale and End-of-Life Announcement for the Cisco Aironet 1550 Series
Outdoor Access Point for additional information.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o For information about fixed software releases, consult the Cisco bug ID(s)
at the top of this advisory.
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
providers.
Exploitation and Public Announcements
o 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
o This vulnerability was found during resolution of a TAC support case.
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.
Subscribe to Cisco Security Notifications
o Subscribe
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181017-aironet-dos
Revision History
o
+----------+---------------------------+----------+--------+------------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+------------------+
| 1.0 | Initial public release. | - | Final | 2018-October-17 |
+----------+---------------------------+----------+--------+------------------+
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