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Cisco Security Advisory

Default SNMP Community Strings in Cisco IP/VC Products

Advisory ID: cisco-sa-20050202-ipvc

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20050202-ipvc

Revision 1.0

For Public Release 2005 February 2 16:00  UTC (GMT)


Summary

Hard-coded Simple Network Management Protocol (SNMP) community strings are present in Cisco IP/VC Videoconferencing System models 3510, 3520, 3525 and 3530. Any user who has access to the vulnerable devices and knows the community strings, can obtain total control of the device.

Cisco strongly recommends that all users deploy the mitigation measures outlined in the Workaround section.

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20050202-ipvc.

Affected Products

Vulnerable Products

The following products are known to be vulnerable:

  • Cisco IPVC-3510-MCU
  • Cisco IPVC-3520-GW-2B
  • Cisco IPVC-3520-GW-4B
  • Cisco IPVC-3520-GW-2V
  • Cisco IPVC-3520-GW-4V
  • Cisco IPVC-3520-GW-2B2V
  • Cisco IPVC-3525-GW-1P
  • Cisco IPVC-3530-VTA

Products Confirmed Not Vulnerable

The following products are known not to be vulnerable:

  • Cisco IPVC-3511-MCU
  • Cisco IPVC-3511-MCU-E
  • Cisco IPVC-3521-GW-4B
  • Cisco IPVC-3526-GW-1P
  • Cisco IPVC-3540-EMP
  • Cisco IPVC-3540-EMP3
  • Cisco IPVC-3540-MCU03A
  • Cisco IPVC-3540-MCU06A
  • Cisco IPVC-3540-MCU10A
  • Cisco IPVC-3540-GW2P
  • Cisco IPVC-3540-GW4S

No other Cisco products are currently known to be affected by this vulnerability. In particular, video-enabled Cisco IP video telephones are not affected.

Details

Affected products contain hard-coded SNMP community strings. SNMP is used for managing and monitoring an IP/VC device and community strings are the equivalent to a password. All models listed as affected are vulnerable regardless of the software release they are running.

There is no Cisco bug ID associated with this issue.

Vulnerability Scoring Details

Cisco did not provide scores for the vulnerability in this advisory based on the Common Vulnerability Scoring System (CVSS) at time of publication.

Impact

A user with knowledge of the community strings can gain full control of the device. Such user can, among other things, create new services, terminate or affect existing sessions, and redirect traffic to a different destination.

Software Versions and Fixes

Cisco will not provide fixed software for this vulnerability. Customers are strongly advised to deploy the mitigation measures described in the Workaround section.


Workarounds

The only mitigation for this vulnerability is to disable SNMP traffic at the switch port that is connected to the affected device. If that cannot be done, the SNMP traffic to the IP/VC device should be blocked at the nearest possible point. In order for the mitigation to be successful all possible paths to the device must be protected. This can be done by blocking traffic on UDP (User Datagram Protocol) ports 161 and 162. Port 161 is used for inbound/outbound read/write SNMP access and port 162 is used for outbound traffic for SNMP traps. Blocking these ports disables all configuration and traps to/from the device. Access to ports 161 and 162 from the trusted hosts should be temporarily enabled and the IPVC Configuration Utility used when configuration changes are required on the affected IP/VC device.

The effectiveness of any workaround is dependent on specific customer situations such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround is the most appropriate for use in the intended network before it is deployed.

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 with Service Contracts

Customers with contracts 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.

Customers Using Third-Party Support Organizations

Customers whose Cisco products 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 support organization for guidance and assistance with the appropriate course of action in regards to this advisory.

The effectiveness of any workaround or fix is dependent on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed.

Customers Without Service Contracts

Customers who purchase direct from Cisco but do not hold a Cisco service contract, and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should acquire upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows.

  • +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 their product serial number available and be prepared to give the URL of this notice as evidence of entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.

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

Exploitation and Public Announcements

The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.

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-20050202-ipvc

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 1.0

2005-February-02

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.


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