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Cisco ATA 187 Analog Telephone Adaptor Remote Access Vulnerability

Advisory ID: cisco-sa-20130206-ata187

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130206-ata187

Revision 1.0

For Public Release 2013 Februrary 6 16:00  UTC (GMT)


Summary

Cisco ATA 187 Analog Telephone Adaptor firmware versions 9.2.1.0 and 9.2.3.1 contain a vulnerability that could allow an unauthenticated, remote attacker to access the operating system of the affected device.

Cisco has released free software updates that address this vulnerability. Workarounds that mitigate this vulnerability are available.

This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130206-ata187

Affected Products


Vulnerable Products

The Cisco ATA 187 Analog Telephone Adaptor is affected by this vulnerability when it is running firmware version 9.2.1.0 or 9.2.3.1.

To check the firmware version on the Cisco ATA 187 Analog Telephone Adaptor, an administrator can view the SW_Version ID field on the device web interface.

Products Confirmed Not Vulnerable

The following Cisco products are confirmed not vulnerable:
  • Cisco ATA 186 Analog Telephone Adaptor
  • Cisco ATA 188 Analog Telephone Adaptor
No other Cisco products are currently known to be affected by this vulnerability.

Details

Cisco ATA 187 Analog Telephone Adaptor firmware versions 9.2.1.0 and 9.2.3.1 contain a vulnerability that could allow an unauthenticated, remote attacker to access the operating system of the affected device.

The vulnerability is due to improper validation of authentication on TCP port 7870 and improper authorization of commands within the operating system. An attacker could exploit this vulnerability by connecting to the affected system and sending arbitrary commands.
This vulnerability has been documented in Cisco Bug ID CSCtz67038 (registered customers only) and has been assigned the Common Vulnerabilities and Exposures (CVE) ID CVE-2013-1111.

Vulnerability Scoring Details

Cisco has scored the vulnerability 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



CSCtz67038: Cisco ATA 187 Analog Telephone Adaptor Remote Access Vulnerability

Calculate the environmental score of CSCtz67038

CVSS Base Score - 9.0

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

Partial

Partial

Complete

CVSS Temporal Score - 7.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed


Note: By true CVSS definition this advisory actually covers two vulnerabilities represented in this document as one. The first vulnerability is the bypass of access controls to the device. The second is unauthenticated command execution on the device. It has been represented here as a single vulnerability to properly expose the severity of these chained vulnerabilities.

Impact

Successful exploitation of the vulnerability may cause a denial of service condition or allow the execution of operating system commands on the device.

Software Versions and Fixes

This vulnerability is addressed in the Cisco ATA 187 Analog Telephone Adaptor firmware version 9.2.3.1 ES build 4 or later.  

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 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.

Currently there are no plans to publish any further releases of Cisco ATA 187 Analog Telephone Adaptor firmware to Cisco Software download section on Cisco.com.

Customers who require a fixed release, should contact their support organizations as described in the "Obtaining Fixed Software" section of this advisory. 

Workarounds

It is possible to terminate the listening Telnet process on the device by accessing the device remotely, listing the processes, and then terminating the Telnet process. This prevents further remote access to the device until the device is reloaded.

Additional mitigations that can be deployed on Cisco devices within the network are available in the companion document "Identifying and Mitigating Exploitation of the Cisco ATA 187 Analog Telephone Adaptor Remote Access Vulnerability," which is available at the following
link: http://tools.cisco.com/security/center/viewAMBAlert.x?alertId=27921

Obtaining Fixed Software

Cisco has released free software updates that address the vulnerability described in this advisory. Prior to deploying software, customers are advised to consult their maintenance providers or check the software for feature set compatibility and known issues that are specific to their environments.

Customers may only install and expect support for feature sets they have purchased. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html.

Customers with Service Contracts

Customers with contracts should obtain upgraded software through their regular update channels.

Customers using Third Party Support Organizations

Customers with Cisco products that are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers, should contact that organization for assistance with the appropriate course of action.

The effectiveness of any workaround or fix depends on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Because of the variety of affected products and releases, customers should consult their service providers or support organizations to ensure that any applied workaround or fix is the most appropriate in the intended network before it is deployed.

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):

  • +1 800 553 2447 (toll free from within North America)
  • +1 408 526 7209 (toll call from anywhere in the world)
  • e-mail: tac@cisco.com

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. Customers without service contracts should request free upgrades through the TAC.

Refer to Cisco Worldwide Contacts at http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, instructions, and e-mail addresses for support in various languages.

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.

This vulnerability was discovered when handling customer support requests.

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-20130206-ata187

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 2013-February-06 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.