Advisory ID: cisco-sa-20110601-cnr
For Public Release 2011 June 1 16:00 UTC (GMT)
Cisco Network Registrar Software Releases prior to 7.2 contain a
default password for the administrative account. During the initial
installation, users are not forced to change this password, allowing it to
persist after the installation. An attacker who is aware of this vulnerability
could authenticate with administrative privileges and arbitrarily change the
configuration of Cisco Network Registrar.
The upgrade to Software Release 7.2 is not free; however, a workaround
is provided in this document that will prevent exploitation of the
When performing an upgrade to Software Release 7.2, you must use the
workaround to change the password of the administrative account. You will be
prompted to enter a new administrator's password only if you are performing a
new installation of Software Release 7.2 of Cisco Network Registrar.
The workaround for this vulnerability is to change the password
associated with the administrative account using the method described in the
This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110601-cnr
This vulnerability affects all releases of Cisco Network Registrar
prior to Software Release 7.2. The vulnerability is present in the affected
releases on all platforms.
To verify the release of Cisco Network Registrar that is running,
select the About option from the menu. Alternatively, if using
the command-line interface, execute the following command:
nrcmd> session get version
No other Cisco products are currently known to be affected by this
Cisco Network Registrar provides highly scalable and reliable DNS,
DHCP, and TFTP services. The central management capabilities of Cisco Network
Registrar simplify administrative tasks associated with network and device
Cisco Network Registrar contains a default password for the
administrative account. An attacker could use this knowledge to authenticate
with administrative privileges and arbitrarily change the configuration of
Cisco Network Registrar. This vulnerability is documented in Cisco bug ID
registered customers only)
and has been assigned the Common
Vulnerabilities and Exposures (CVE) identifier CVE-2011-2024.
Additionally, it is a good practice to change passwords periodically.
The interval should comply with an organization's security policy but, as a
guideline, passwords should be changed two to three times a year. This practice
applies equally to all products regardless of when they are installed and to
all users, administrators and non-administrators.
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
Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at
Initially supplied admin password not changed during the
Calculate the environmental score of
CVSS Base Score - 10
CVSS Temporal Score - 8.3
Successful exploitation of the vulnerability may allow an attacker to
make arbitrary changes to the configuration of Cisco Network Registrar.
When considering software upgrades, also consult
and any subsequent advisories to determine exposure and a complete upgrade
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 Technical
Assistance Center (TAC) or your contracted maintenance provider for assistance.
This vulnerability is fixed in Software Release 7.2. All releases of
Cisco Network Registrar prior to 7.2 will not force users to change the
administrative password during the initial installation.
The provided workaround changes the password that is associated with
the administrator's account. To change the password using the web interface,
select Advanced -> Administrators -> Admin from the
Execute the following command to change the administrator's password
using the command-line interface:
admin <admin-name> enterPassword
Additionally, access to Cisco Network Registrar (TCP ports 8080, 8090,
8443, and 8453) and the host on which it is running should be limited to
legitimate IP addresses. Consult the documentation of the host operating system
for further details how to accomplish this task.
The use of IP addresses as a form of authentication is a
well-established network security practice. For more guidance on the use of
access control lists (ACLs) or the explicit identification of network
management stations in devices and applications, reference the white paper
Security-Oriented Approach to IP Addressing at the following link:
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 email@example.com or firstname.lastname@example.org for software upgrades
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 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 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)
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
for additional TAC contact information, including localized telephone numbers,
and instructions and e-mail addresses for use in various languages.
The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.
This vulnerability was discovered during an internal review.
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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.
This advisory is posted on Cisco's worldwide website at:
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.
Initial public release