AV:N/AC:L/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C
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A vulnerability in the HTTP URL redirect feature of Cisco Wireless LAN Controller (WLC) Software could allow an unauthenticated, remote attacker to cause a buffer overflow condition on an affected device, resulting in a denial of service (DoS) condition.
The vulnerability is due to improper handling of HTTP traffic by the affected software. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to cause a buffer overflow condition on the device, which could allow the attacker to cause the device to reload, resulting in a DoS condition, or execute arbitrary code on 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: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160420-htrd
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Vulnerable Products
The following releases of Cisco WLC Software are vulnerable:
- All 7.2 releases
- All 7.3 releases
- All 7.4 releases prior to 7.4.140.0(MD)
- All 7.5 releases
- All 7.6 releases
- All 8.0 releases prior to 8.0.115.0(ED)
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 WLC Software releases prior to Release 7.2. Cisco has also confirmed that this vulnerability does not affect Cisco WLC Software releases 8.1 and later.
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Exploitation of this vulnerability could cause an affected device to reload and generate a crash file. Contact the Cisco Technical Assistance Center (TAC) to review the crash file and determine whether the device has been compromised by exploitation of this vulnerability.
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There are no workarounds that address this vulnerability.
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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 consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories 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 Technical Assistance Center (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 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-20160420-bdos: Cisco Wireless LAN Controller Denial of Service Vulnerability
- cisco-sa-20160420-htrd: Cisco Wireless LAN Controller HTTP Parsing Denial of Service Vulnerability
- cisco-sa-20160420-wlc: Cisco Wireless LAN Controller Management Interface Denial of Service Vulnerability
Customers should upgrade to an appropriate release as indicated in the following table:
Cisco WLC Software
Major ReleaseFirst Fixed Release for
This VulnerabilityFirst Fixed Release for
This Vulnerability and
All Vulnerabilities Described in
the Collection of Advisories7.2 8.0.132.0 8.0.132.0 7.3
8.0.132.0 8.0.132.0 7.4 7.4.140.0(MD) 8.0.132.0 7.5 8.0.132.0 8.0.132.0 7.6 8.0.132.0 8.0.132.0 8.0 8.0.115.0(ED) 8.0.132.0
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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.
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This vulnerability was found during Cisco internal testing.
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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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Version Description Section Status Date 1.0 Initial public release. — Final 2016-April-20
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