Cisco RV220W Management Authentication Bypass Vulnerability

Summary

• A vulnerability in the web-based management interface of Cisco RV220W Wireless Network Security Firewall devices could allow an unauthenticated, remote attacker to bypass authentication and gain administrative privileges on a targeted device.
  
  The vulnerability is due to insufficient input validation of HTTP request headers that are sent to the web-based management interface of an affected device. An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted HTTP request that contains malicious SQL statements to the management interface of a targeted device. Depending on whether remote management is configured for the device, the management interface may use the SQL code in the HTTP request header to determine user privileges for the device. A successful exploit could allow the attacker to bypass authentication on the management interface and gain administrative privileges on the device.
  Cisco released a firmware update that addresses this vulnerability. There are workarounds that address this vulnerability.
  
  This advisory is available at the following link:

  http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160127-rv220

Affected Products

• Vulnerable Products

  Cisco RV220W Wireless Network Security Firewall devices running firmware releases prior to 1.0.7.2 are affected by this vulnerability.
  

  Products Confirmed Not Vulnerable

  The following devices are not affected by this vulnerability:
  

  • Cisco RV120W Wireless-N VPN Firewall
  • Cisco RV180 VPN Router
  • Cisco RV180W Wireless-N Multifunction VPN Router

  
  No other Cisco products are currently known to be affected by this vulnerability.

Indicators of Compromise

• This vulnerability could allow an attacker to gain administrative privileges on an affected device. If the Authentication, Accounting, and Authorization (AAA) log files for a device contain suspect or malicious login data, the device may have been compromised by this vulnerability.

Workarounds

• To work around this vulnerability, administrators can disable or restrict access to remote management functionality for an affected device.
  
  Disable Remote Management

  Caution: If a WAN connection must be used to manage a device, do not disable remote management functionality for the device. Disabling this functionality will result in the loss of all remote management connectivity for the device and prevent use of Cisco QuickVPN to access the device.

  By disabling remote management functionality, administrators help ensure that only users on the same LAN as the device can access configuration and other settings for the device. This access requirement may reduce the likelihood of an attempted or successful exploit. Remote management is disabled by default.

  If remote management is enabled, administrators can disable it by doing the following in the management interface:

  1. In the navigation tree, choose Administration > Management Interface > Web Access.
  2. Next to Remote Management, check the Disable check box.
  3. Click Save.

  Restrict Access to Remote Management

  If remote management functionality is required, administrators can restrict access to this functionality by allowing only specific IP addresses to access configuration and other settings for the device. Note that this workaround does not prevent an attacker from spoofing an IP address that is configured on the device. By default, access from any IP address is supported.

  To restrict access to remote management, administrators can do the following in the management interface:

  1. In the navigation tree, choose Administration > Management Interface > Web Access.
  2. Use the remote management IP address settings to specify which IP addresses can access device settings.
  3. Click Save.

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 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 Versions

  A fix for this vulnerability is included in Release 1.0.7.2 of the firmware for Cisco RV220W Wireless Network Security Firewall devices. To download the updated firmware, visit Cisco Software Central and navigate to Products > Routers > Small Business Routers > Small Business RV Series Routers > RV220W Wireless Network Security Firewall.

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 vulnerability was reported to Cisco by an anonymous researcher working with the Beyond Security's SecuriTeam Secure Disclosure program. Cisco would like to thank this team for reporting the vulnerability.

URL

• http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160127-rv220

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	-	Final	2016-January-27

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