Summary
Affected Products
Details
Impact
Software Versions and Fixes
Obtaining Fixed Software
Workarounds
Exploitation and Public Announcements
Status of This Notice: FINAL
Distribution
Revision History
Cisco Security Procedures
The default installation of Cisco voice products on the IBM platform will install the Director Agent in an unsecure state, leaving the Director services vulnerable to remote administration control and/or Denial of Service attacks. The vulnerabilities can be mitigated by configuration changes and Cisco is providing a repair script that will close the vulnerable ports and put the Director agent in secure state without requiring an upgrade.
This advisory will be available at http://www.cisco.com/warp/public/707/cisco-sa-20040121-voice.shtml.
Cisco voice products running on IBM servers installed with the default configurations are affected if they leave TCP or UDP port 14247 open. To verify this vulnerability, the administrator may open a command window on the server and type netstat -a. If port 14247 is listed, the server is vulnerable to remote administrative control and Denial of Service attacks.
Affected Cisco voice products:
Affected IBM-based server model numbers:
Affected OS Versions:
The default installations of Cisco voice products on IBM servers will install IBM Director in unsecure state leaving TCP and UDP ports 14247 open. Any Director Server/Console agent can connect over port 14247 to gain administrative level control without requiring authentication. Also, a network security scanner scanning port 14247 can trigger the IBM Director agent process twgipc.exe to use 100% of the CPU until the server is rebooted. These vulnerabilities are documented in the two Cisco bug IDs:
A Cisco voice server with the IBM Director agent in unsecure state is susceptible to administrative level control and Denial of Service attacks.
Administrative level control includes the following functionality: shutdown/power off/restart, remote command shell, file transfer, processes/services/device drivers stop and start, network configuration modification (including domain/workgroup membership), Windows 2000 user account creation, and SNMP configuration modification.
In a Denial of Service attack, an attacker can render the Cisco voice server inoperative with CPU utilization spiking to 100%, and the IBM server must be powered off or rebooted in order to regain control of the machine.
The vulnerabilities are specific to Cisco voice products on IBM servers and all vulnerabilities listed in this advisory can be mitigated with the repair script without requiring an upgrade.
The repair script is available at:
http://www.cisco.com/pcgi-bin/tablebuild.pl/cmva-3des
As the mitigation for the vulnerabilities is a repair script, a software upgrade is not required to address the vulnerabilities. However, if you have a service contract, and wish to upgrade to unaffected code, you may obtain upgraded software through your regular update channels once that software is available. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's Worldwide Web site at http://www.cisco.com.
If you need assistance with the implementation of the workarounds, or have questions on the workarounds, please contact the Cisco Technical Assistance Center (TAC).
See http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml for additional TAC contact information, including special localized telephone numbers and instructions and e-mail addresses for use in various languages.
Please do not contact either "psirt@cisco.com" or "security-alert@cisco.com" for software upgrades.
Cisco's repair script adds 3 levels of improved security to the Director agent:
Note: If you are using IBM Director Server and Console to monitor the Cisco voice products, this repair script will disable the connection to those IBM servers. The Director agents will still provide pop-up warnings and Event Viewer messages in version 3.11, and SNMP traps to network management software like CiscoWorks IP Telephony Monitor. To regain IBM Director Server monitoring capabilities, IBM Director agent 4.11 will be released in OS Upgrade 2000.2.6 and support can be re-enabled for Director Server after the upgrade to OS version 2000.2.6.
The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.
This is a FINAL notice. Although Cisco cannot guarantee the accuracy of all statements in this notice, all of the facts have been checked to the best of our ability. Cisco does not anticipate issuing updated versions of this advisory unless there is some material change in the facts. Should there be a significant change in the facts, Cisco will update this advisory.
This notice will be posted on Cisco's worldwide website at http://www.cisco.com/warp/public/707/cisco-sa-20040121-voice.shtml. 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:
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.
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Revision 1.0 |
2004-January-21 |
Initial public release. |
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/en/US/products/products_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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| Updated: Oct 08, 2004 | Document ID: 47983 |