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Cisco Call Manager Privilege Escalation
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SUMMARY
Cisco CallManager (CCM) is "the software-based call-processing component
of the Cisco IP telephony solution which extends enterprise telephony
features and functions to packet telephony network devices such as IP
phones, media processing devices, voice-over-IP (VoIP) gateways, and
multimedia applications". Cisco CallManager versions with Multi Level
Administration (MLA) enabled may be vulnerable to privilege escalations,
which may result in read-only users gaining administrative access.
Successful exploitation of the vulnerability may result in privilege
escalation where read-only administrative users can gain full
administrative privileges and create, delete, or reset devices.
DETAILS
Vulnerable Systems:
* Cisco CallManager 3.2 and earlier
* Cisco CallManager 3.3, versions earlier than 3.3(5)SR1
* Cisco CallManager 4.0, versions earlier than 4.0(2a)SR2c
* Cisco CallManager 4.1, versions earlier than 4.1(3)SR2
Complete this procedure to check if Multi Level Administration is enabled:
1. Access CCM Administration with this URL: http://<CCMServer>/ccmadmin,
where <CCMServer> specifies the IP address or name of the Cisco
CallManager server.
2. Choose User > Access Rights > Configure MLA Parameters. The MLA
Enterprise Parameter Configuration page displays.
3. MLA is enabled if the Enable MultiLevelAdmin enterprise parameter is
set to True.
An administrative user with read-only permission can use a crafted URL on
the CCMAdmin web page to escalate privileges to a full administrative
level. This vulnerability applies to users who are authenticated to the
read-only administrative level. Users with no administrative access and
users with full administrative permissions continue to work as expected.
Administrative users with access privilege Read Only should not be
confused with the standard User Group named "Read Only" which is created
at installation. For further details on user groups and assigning access
privileges, please refer to this URL:
<http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a00803ed6ea.html#wp1022471>
Multilevel Administration Access Configuration
* CSCef75361, CSCsb12765, CSCsb88649, CSCsc26275?CCMAdmin Read Only User
Can Escalate Privileges
It is possible to eliminate the ability for an attacker to escalate
privileges from Read Only to Full Access without applying the service
release by not using the Read Only access privilege, but instead only
using the No Access or Full Access privileges. This is not an ideal
solution, but can provide a temporary workaround.
For detailed instructions on configuring the privileges for a User Group
within Cisco CallManager 4.1(3) see the Multilevel Administration Access
Configuration:
<http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a00803ed6ea.html#wp1022609>
Assigning Privileges to a User Group
Section of the Cisco CallManager Administration Guide:
<http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_book09186a00803be4ec.html>
Cisco CallManager Administration Guide, Release 4.1(3)
ADDITIONAL INFORMATION
The original article can be found at:
<http://www.cisco.com/warp/public/707/cisco-sa-20060118-ccmpe.shtml>
http://www.cisco.com/warp/public/707/cisco-sa-20060118-ccmpe.shtml
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