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Cisco Security Advisory

Cisco Small Business SRP 500 Series Multiple Vulnerabilities

Advisory ID: cisco-sa-20120223-srp500

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120223-srp500

Revision 1.0

For Public Release 2012 February 23 16:00  UTC (GMT)

Related Resources:


Summary

Cisco Small Business (SRP 500) Series Services Ready Platforms contain the following three vulnerabilities:

  • Cisco SRP 500 Series Web Interface Command Injection Vulnerability
  • Cisco SRP 500 Series Unauthenticated Configuration Upload Vulnerability
  • Cisco SRP 500 Series Directory Traversal Vulnerability
These vulnerabilities can be exploited using sessions to the Services Ready Platform Configuration Utility web interface. These vulnerabilities could be exploited from the local LAN side of the SRP device by default configuration and the WAN side of the SRP device if remote management is enabled.  Remote management is disabled by default.

Cisco has released free software updates that address these vulnerabilities.

Workarounds that mitigate these vulnerabilities are available.

This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120223-srp500

Affected Products

Vulnerable Products

The following Cisco SRP 520 Series models are affected if running firmware prior to version 1.1.26:
  • Cisco SRP 521W
  • Cisco SRP 526W
  • Cisco SRP 527W

The following Cisco SRP 520W-U Series models are affected if running firmware prior to version 1.2.4:

  • Cisco SRP 521W-U
  • Cisco SRP 526W-U
  • Cisco SRP 527W-U

The following Cisco SRP 540 Series models are affected if running firmware prior to version 1.2.4:

  • Cisco SRP 541W
  • Cisco SRP 546W
  • Cisco SRP 547W
To view the firmware version on a device, log in to the Services Ready Platform Configuration Utility and navigate to the Status > Router page to view information about the Cisco SRP Series device and its firmware status.  The Firmware Version field indicates the current running version of firmware on the Cisco SRP 500 Series device.

Products Confirmed Not Vulnerable

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

Details

Cisco SRP 500 Series devices are a flexible, cost-effective, fixed-configuration customer premises equipment (CPE) with embedded intelligence to enable service providers to create, provision, and deploy premium revenue-generating services to small businesses on an as-needed basis.

Cisco SRP 500 Series devices running affected versions of firmware contain the following three vulnerabilities.   These vulnerabilities could be exploited from the local LAN side of the SRP device by default configuration and the WAN side of the SRP device if remote management is enabled.  Remote management is disabled by default:

Cisco SRP 500 Series Web Interface Command Injection Vulnerability

Cisco SRP 500 Series devices contain a command injection vulnerability that could allow an authenticated session to inject commands to be executed by the operating system.

An attacker could exploit this vulnerability by either enticing an administrator to access a crafted link or by performing a man-in-the-middle attack to intercept an authenticated session.  An exploit could allow the attacker to execute operating system commands on the device that are run in the context of the root user.

This vulnerability has been documented in Cisco bug ID CSCtt46871 (registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2012-0363.

Cisco SRP 500 Series Unauthenticated Configuration Upload Vulnerability

Cisco SRP 500 Series devices contain an unauthorized access vulnerability that could allow an unauthenticated, remote attacker to upload an unauthorized configuration file.

An attacker could exploit this vulnerability by first creating a desired configuration file and then uploading it using the unauthenticated URL. An exploit could allow the attacker to alter the configuration of the Cisco SRP 500 Series device.

This vulnerability has been documented in Cisco bug ID CSCtw55495 (registered customers only) and has been assigned CVE ID CVE-2012-0364.

Cisco SRP 500 Series Directory Traversal Vulnerability

Cisco SRP 500 Series devices contain a directory traversal vulnerability in the Local TFTP file upload application that could allow an authenticated, remote attacker to upload files to directories in the operating system of the Cisco SRP 500 Series device.  An attacker could exploit this vulnerability by enticing an authenticated user to click on a crafted link or by installing malicious files on the FTP or HTTP server that the administrators of the device may use. An exploit could allow the attacker to install malicious software on the Cisco SRP 500 Series device to launch future attacks.

This vulnerability has been documented in Cisco bug ID CSCtw56009 (registered customers only) and has been assigned CVE ID CVE-2012-0365.

Vulnerability Scoring Details

Cisco has scored the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this security advisory is in accordance with CVSS version 2.0.

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

Cisco has provided a base and temporal score. Customers can also compute environmental scores that help determine the impact of the vulnerability in their own networks.

Cisco has provided additional information regarding CVSS at the following link:

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html 

Cisco has also provided a CVSS calculator to compute the environmental impact for individual networks at the following link:

http://intellishield.cisco.com/security/alertmanager/cvss 



CSCtt46871: Cisco SRP 500 Series Web Interface Command Injection Vulnerability

Calculate the environmental score of CSCtt46871

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



CSCtw55495: Cisco SRP 500 Series Unauthenticated Configuration Upload Vulnerability

Calculate the environmental score of CSCtw55495

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

Complete

None

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed



CSCtw56009: Cisco SRP 500 Series Directory Traversal Vulnerability

Calculate the environmental score of CSCtw56009

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

Impact

Successful exploitation of these vulnerabilities may result in the execution of arbitrary commands on the device or the uploading of files that may be malicious, which may allow the attacker to alter the device configuration.

Software Versions and Fixes

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 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.

Affected Product

First Fixed Release

Cisco SRP 521W

1.1.26

Cisco SRP 526W

1.1.26

Cisco SRP 527W

1.1.26

Cisco SRP 521W-U

1.2.4

Cisco SRP 526W-U

1.2.4

Cisco SRP 527W-U

1.2.4

Cisco SRP 541W

1.2.4

Cisco SRP 546W

1.2.4

Cisco SRP 547W

1.2.4

The latest Cisco SRP 500 Series Services Ready Platforms firmware can be downloaded at http://www.cisco.com/cisco/software/navigator.html?mdfid=282736194&i=rm


Workarounds

The Cisco SRP 500 Series devices are designed as CPE devices, and only disabling access from the outside network will prevent exploitation, from remote networks.  The following mitigations help limit exposure to this vulnerability:

  • Disable Remote Management

    Caution: Do not disable remote management if administrators manage devices using the WAN connection. This action will result in a loss of management connectivity to the device.

    Remote Management is disabled by default. If it is enabled, administrators can disable this feature by choosing Administration > Web Access Management. Change the setting for the Remote Management field to Disabled.
Disabling remote management limits exposure because the vulnerability can then be exploited from the inter-LAN network only.
  • Limit Remote Management Access to Specific IP Addresses

    If remote management is required, secure the device so that it can be accessed by certain IP addresses only, rather than the default setting of All IP Addresses. After choosing Administration > Web Access Management, an administrator can change the Allowed Remote IP Address setting to ensure that only devices with specified IP addresses can access the device.

Obtaining Fixed Software

Cisco has released free software updates that address this vulnerability. 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

See the Obtaining Fixed Software section of this advisory.

Customers Using Third-Party Support Organizations

See the Obtaining Fixed Software section of this advisory.

Customers Without Service Contracts

See the Obtaining Fixed Software section of this advisory. 

Exploitation and Public Announcements

The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.

These vulnerabilities were 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 Security at the following link:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120223-srp500

Additionally, a text version of this advisory is clear signed with the Cisco PSIRT PGP key and circulated among the following e-mail addresses:

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

Future updates of this advisory, if any, will reside on Cisco.com but may not be announced on mailing lists. Users can monitor this advisory's URL for any updates.


Revision History

Revision 1.0

2012-February-23

Initial public release

Cisco Security Procedures

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