Advisory ID: cisco-sa-20110202-tandbergRevision 1.0
For Public Release 2011 February 2 16:00 UTC (GMT)
Tandberg C Series Endpoints and E/EX Personal Video units that are
running software versions prior to TC4.0.0 ship with a root administrator
account that is enabled by default with no password. An attacker could use this
account in order to modify the application configuration or operating system
settings.
Resolving this default password issue does not require a
software upgrade and can be changed or disabled by a configuration command for
all affected customers. The workaround detailed in this document demonstrates
how to disable the root account or change the password.
This advisory is posted at
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110202-tandberg.
This vulnerability affects Tandberg C Series Endpoints and E/EX
Personal Video units, including software that is running on the C20, C40, C60,
C90, E20, EX60, and EX90 codecs. The software version of the Tandberg unit can
be determined by logging into the web-based user interface (UI) or using the
"xStatus SystemUnit" command.
Users can determine the Tandberg software version by
entering the IP address of the codec in a web browser, authenticating (if the
device is configured for authentication), and then selecting the "system info"
menu option. The version number is displayed after the "Software Version" label
in the System Info box.
Alternatively the software version can be determined from
the device's application programmer interface using the "xStatus SystemUnit"
command. The software version running on the codec is displayed after the
"SystemUnit Software Version" label. The output from "xStatus SystemUnit" will
display a result similar to the following:
xStatus SystemUnit
*s SystemUnit ProductType: "Cisco TelePresence Codec"
*s SystemUnit ProductId: "Cisco TelePresence Codec C90"
*s SystemUnit ProductPlatform: "C90"
*s SystemUnit Uptime: 597095
*s SystemUnit Software Application: "Endpoint"
*s SystemUnit Software Version: "TC4.0"
*s SystemUnit Software Name: "s52000"
*s SystemUnit Software ReleaseDate: "2010-11-01"
*s SystemUnit Software MaxVideoCalls: 3
*s SystemUnit Software MaxAudioCalls: 4
*s SystemUnit Software ReleaseKey: "true"
*s SystemUnit Software OptionKeys NaturalPresenter: "true"
*s SystemUnit Software OptionKeys MultiSite: "true"
*s SystemUnit Software OptionKeys PremiumResolution: "true"
*s SystemUnit Hardware Module SerialNumber: "B1AD25A00003"
*s SystemUnit Hardware Module Identifier: "0"
*s SystemUnit Hardware MainBoard SerialNumber: "PH0497201"
*s SystemUnit Hardware MainBoard Identifier: "101401-3 [04]"
*s SystemUnit Hardware VideoBoard SerialNumber: "PH0497874"
*s SystemUnit Hardware VideoBoard Identifier: "101560-1 [02]"
*s SystemUnit Hardware AudioBoard SerialNumber: "N/A"
*s SystemUnit Hardware AudioBoard Identifier: ""
*s SystemUnit Hardware BootSoftware: "U-Boot 2009.03-65"
*s SystemUnit State System: Initialized
*s SystemUnit State MaxNumberOfCalls: 3
*s SystemUnit State MaxNumberOfActiveCalls: 3
*s SystemUnit State NumberOfActiveCalls: 1
*s SystemUnit State NumberOfSuspendedCalls: 0
*s SystemUnit State NumberOfInProgressCalls: 0
*s SystemUnit State Subsystem Application: Initialized
*s SystemUnit ContactInfo: "helpdesk@company.com"
** end
No other Cisco products are currently known to be affected by these
vulnerabilities.
Tandberg devices are part of the Cisco TelePresence Systems that
provide Cisco TelePresence endpoints for immersive environments, conference
rooms, individual desktops and home offices. The C Series Endpoints are
typically deployed as Multipurpose Room Systems and the E/EX Personal Video
units are desktop devices.
These devices contain a root user that is enabled for
advanced debugging that is unnecessary during normal operations. The root
account is not the same as the admin and user accounts. The root user is
enabled by default in software versions prior to TC 4.0.0. The default
configuration prior to TC 4.0.0 does not set a password for the root user.
When a device is upgraded to TC 4.0.0, the root user is
disabled. System software for Tandberg C Series Endpoints and E/EX Personal
Video units is available for download at:
http://www.tandberg.com/support/video-conferencing-software-download.jsp?t=2
 .
For instructions on how to set a root password or disable the root user on
other software versions, see the workaround section of this advisory.
This vulnerability has been assigned the CVE ID
CVE-2011-0354.
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
http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html .
Cisco has also provided a CVSS calculator to help compute
the environmental impact for individual networks at
http://intellishield.cisco.com/security/alertmanager/cvss .
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Root account enabled by default with no password
Calculate the environmental score of
this
bug
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CVSS Base Score - 10
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Access Vector
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Access Complexity
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Authentication
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Confidentiality Impact
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Integrity Impact
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Availability Impact
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Network
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Low
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None
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Complete
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Complete
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Complete
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CVSS Temporal Score - 8.3
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Exploitability
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Remediation Level
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Report Confidence
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Functional
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Official-Fix
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Confirmed
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Successful exploitation of the vulnerability may allow an unauthorized
user to modify the application configuration and the operating system settings
or gain complete administrative control of the device.
When considering software upgrades, also consult
http://www.cisco.com/go/psirt
and any 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 Technical
Assistance Center (TAC) or your contracted maintenance provider for
assistance.
The root user is disabled in the default configuration starting in the
TC4.0.0 software version. To disable the root account, an administrator should
log in to the applications programmer interface and use the command
"systemtools rootsettings off" to temporarily disable the account, or the
command "systemtools rootsettings never" to permanently disable the root
user.
The root user is enabled for advanced debugging. If the
root user is needed, the password should be configured when the account is
enabled. This can be done through the command "systemtools rootsettings on
[password]".
Devices running software version TC 4.0.0 or later
The root user is disabled in the default configuration starting in the
TC4.0.0 software version. To disable the root account, an administrator should
log in to the applications programmer interface and use the command
"systemtools rootsettings off" to temporarily disable the account, or the
command "systemtools rootsettings never" to permanently disable the root
user.
The root user is enabled for advanced debugging. If the
root user is needed, the password should be configured when the account is
enabled. This can be done through the command "systemtools rootsettings on
[password]".
The default configuration of devices running TC4.0.0 does
not contain a password for the administrator account. The password for the
administrator account should be set with the command "xCommand SystemUnit
AdminPassword Set Password: [password].
Devices running software versions prior to TC 4.0.0
The root user cannot be disabled on devices running software versions
prior to TC4.0.0. The password for the root account is the same as the
administrator password. The administrator password is set with the command
"xCommand SystemUnit AdminPassword Set Password: [password]".
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 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)
-
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.
This vulnerability has been discussed in the article "Hacking and
Securing the Tandberg C20" published in Volume 27, Number 3 of the 2600
Magazine.
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.
This advisory is posted on Cisco's worldwide website at:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110202-tandberg
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-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
-
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.
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Revision 1.0
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2011-Feb-02
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Initial public release.
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