Products & Services
Support

Product Categories


Popular Downloads


Manage Software

How to Buy

For Home

Linksys Products Store
Linksys is now part of Belkin
Products for everyone

All Ordering Options

Training & Events Partners
Guest

Cisco Security Advisory

Cisco RVS4000 and WRVS4400N Web Management Interface Vulnerabilities

Advisory ID: cisco-sa-20110525-rvs4000

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110525-rvs4000

Revision 1.1

Last Updated  2011 June 17 17:00  UTC (GMT)

For Public Release 2011 May 25 16:00  UTC (GMT)


Summary

Cisco RVS4000 4-port Gigabit Security Routers and Cisco WRVS4400N Wireless-N Gigabit Security Routers have several web interface vulnerabilities that can be exploited by a remote, unauthenticated user.

Cisco has released free software updates that address these vulnerabilities. Workarounds that mitigate these vulnerabilities are available. This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110525-rvs4000.

Affected Products

Vulnerable Products

These vulnerabilities affect the following devices running firmware prior to the first fixed release documented in the Software Versions and Fixes section of this advisory:

  • Cisco RVS4000 Gigabit Security Router (v1 and v2)
  • Cisco WRVS4400N Wireless-N Gigabit Security Router (V1.0, V1.1, and V2)
    Note: The Cisco WRVS4400N Wireless-N Gigabit Security Router V1.0 and V1.1 have reached end of life, and no further firmware updates are being made available.

To check the version of system firmware that is running on the device, log into the device with the web management interface, and navigate to the screen: Setup --> Summary. Under System Information is a field labeled Firmware Version:. The number directly beside this field label is the system firmware version. An example would be V1.3.0.3.

Products Confirmed Not Vulnerable

No other Cisco products are currently known to be affected by these vulnerabilities.

Details

The Cisco RVS4000 and WRVS4400N Gigabit Security Routers deliver high-speed network access and IPsec VPN capabilities for small businesses. They also provides firewall and intrusion prevention capabilities.

The Cisco RVS4000 and WRVS4400N Gigabit Security Routers contain three web management interface vulnerabilities:

  • Retrieval of the configuration file
    If an administrator of the device has previously created a backup of the configuration, using Administration --> Backup & Restore --> Backup, it is possible for a remote unauthenticated user to access the backup configuration file. This file contains all configuration parameters of the device, including the HTTP authentication password and VPN pre-shared-keys (PSKs).
  • Root operating system arbitrary command injection by an authenticated attacker
    A user who is authenticated to the device can inject arbitrary commands into the underlying operating system with root privileges, via the ping test and traceroute test parameters.
  • Retrieval of admin SSL certificate private key
    The admin SSL certificate private and public keys can be retrieved (used for Quick VPN) by a remote unauthenticated user.

These vulnerabilities are documented in Cisco bug ID CSCtn23871 ( registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) IDs:

  • CVE-2011-1645: Retrieval of the configuration file
  • CVE-2011-1646: Root operating system arbitrary command injection by an authenticated attacker
  • CVE-2011-1647: Retrieval of admin SSL certificate private key

Vulnerability Scoring Details

Cisco has provided scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.

Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.

Cisco has provided an FAQ to answer additional questions regarding CVSS at
http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html .

Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at
http://intellishield.cisco.com/security/alertmanager/cvss .

Retrieval of the configuration file

Calculate the environmental score of Retrieval of the configuration file

CVSS Base Score - 9.3

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Medium

None

Complete

Complete

Complete

CVSS Temporal Score - 7.7

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

Root operating system arbitrary command injection by an authenticated attacker

Calculate the environmental score of t operating system arbitrary command injection by an authenticated attacker

CVSS Base Score - 9.0

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

Single

Complete

Complete

Complete

CVSS Temporal Score - 7.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

Retrieval of admin SSL certificate private key

Calculate the environmental score of Retrieval of admin SSL certificate private key

CVSS Base Score - 5.0

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

Partial

None

None

CVSS Temporal Score - 4.1

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

Impact

Successful exploitation of the vulnerabilities may result in execution of arbitrary commands on the device by an authenticated user or retrieval of configuration files and private keys by an unauthenticated user.

The configuration files contain sensitive information in text, such as the HTTP passwords and PSKs. The retrieval of the certificates may aid in further attacks.

Software Versions and Fixes

When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Small Business Support Center or your contracted maintenance provider for assistance. 

These vulnerabilities have been fixed in the following firmware versions:

Affected Product

Availability of First Fixed Release

RVS4000v1

1.3.3.5

RVS4000v2

2.0.2.7

WRVS4400Nv2

2.0.2.1

The latest Cisco RVS4000 Gigabit Security Router software can be downloaded at http://www.cisco.com/cisco/software/type.html?mdfid=282414013&flowid=787 ( registered customers only)

The latest Cisco WRVS4400N V2 Gigabit Security Router software can be downloaded at http://www.cisco.com/cisco/software/type.html?mdfid=282414016 ( registered customers only)


Workarounds

The following mitigations help limit the exposure to these vulnerabilities.

  • Disable remote management
    Caution: Do not disable remote management if you manage the device via the WAN connection. Doing so will result in loss of management connectivity to the device.

    Remote Management is disabled by default. If it is enabled, administrators can disable it using the Firewall > Basic Settings screen. Change the setting for the field "Remote Management" to "Disabled".

    Disabling remote management limits the exposure of the vulnerabilities to those on the local LAN.
  • Limit remote management access to specific IP addresses
    If remote management is required, harden the device so that it can be accessed only by certain IP addresses, rather than the default setting of "any". By entering the configuration screen at Firewall --> Basic Settings, an administrator can change the Remote IP address field to ensure only devices with the specified IP addresses can access the device.

The following mitigation can help limit the exposure to the vulnerability "Retrieval of the configuration file".

  • Remove all backup configuration files from the device
    Rebooting the device after performing a configuration backup, will remove the configuration file from the system so that it can not be retrieved by an unauthenticated user.

Obtaining Fixed Software

Cisco has released free software updates that address these vulnerabilities. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment.

Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html , or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml .

Do not contact psirt@cisco.com or security-alert@cisco.com for software upgrades

Customers should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com

If the information is not clear, please contact the Cisco Small Business Support Center or your contracted maintenance provider for assistance. Small Business Support Center contacts are as follows.

+1 866 606 1866 (toll free from within North America)

+1 408 418 1866 (toll call from anywhere in the world)

Customers should have their product serial number available.

Refer to http://www.cisco.com/en/US/support/tsd_cisco_small_business_support_center_contacts.html for additional support contact information, including localized telephone numbers, and instructions and e-mail addresses for use in various languages.

Customers with Service Contracts

This section is not relevant to this Cisco Security Advisory, as the vulnerability being disclosed only affects Cisco products that are supported via the Cisco Small Business Support Center. Please refer to the Obtaining Fixed Software section of this advisory.

Customers Using Third-Party Support Organizations

This section is not relevant to this Cisco Security Advisory, as the vulnerability being disclosed only affects Cisco products that are supported via the Cisco Small Business Support Center. Please refer to the Obtaining Fixed Software section of this advisory.

Customers Without Service Contracts

This section is not relevant to this Cisco Security Advisory, as the vulnerability being disclosed only affects Cisco products that are supported via the Cisco Small Business Support Center. Please refer to the Obtaining Fixed Software section of this advisory.

Exploitation and Public Announcements

The Cisco PSIRT is aware that these vulnerabilities have been made public at a conference on May 25th, 2011. The Cisco PSIRT is not aware of any malicious use of the vulnerabilities described in this advisory.

This vulnerability was reported to Cisco by Michal Sajdak of Securitum, Poland.

Status of This Notice: Final

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 stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.


Distribution

This advisory is posted on Cisco's worldwide website at:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110525-rvs4000

In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients.

  • cust-security-announce@cisco.com
  • first-teams@first.org
  • bugtraq@securityfocus.com
  • vulnwatch@vulnwatch.org
  • cisco@spot.colorado.edu
  • cisco-nsp@puck.nether.net
  • full-disclosure@lists.grok.org.uk
  • comp.dcom.sys.cisco@newsgate.cisco.com

Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.


Revision History

Revision 1.1

2011-Jun-16

Modified software table to indicate that First Fixed release for RVS4000v1 is 1.3.3.5.

Revision 1.0

2011-May-25

Initial public release.

Cisco Security Procedures

Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html. This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt.


Download this document (PDF)
View Printable Version