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Cisco Call Manager DoS
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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 has been found to be vulnerable to denial of service
(DoS) attacks, which may result in services being interrupted or servers
rebooting.
DETAILS
Vulnerable Systems:
* Cisco CallManager 3.2 and earlier
* Cisco CallManager 3.3, versions earlier than 3.3(5)SR1a
* Cisco CallManager 4.0, versions earlier than 4.0(2a)SR2c
* Cisco CallManager 4.1, versions earlier than 4.1(3)SR2
Vulnerable versions of Cisco Call Manager do not manage TCP connections
and Windows messages aggressively, leaving some well-known, published
ports vulnerable to Denial of Service attacks.
* CSCea53907?CallManager does not time out TCP connections to port 2000
aggressively enough, leading to a scenario where memory and CPU resources
are consumed with enough open connections. In specific scenarios,
CallManager will leave the TCP connection open indefinitely until either
the Call Manager service is restarted or the server is rebooted.
* CSCsa86197, CSCsb16635, CSCsb64161?Multiple connections to ports 2001,
2002, or 7727 can fill up the Windows message queue. This prevents CCM
from transacting with the Windows Service Manager, which restarts the CCM
after a 30 second timeout.
Successful exploitation of these vulnerabilities may result in DoS
attacks, which may result in high CPU utilization, services being
interrupted, or servers rebooting. This may then lead to phones not
responding, phones unregistering from the Cisco CallManager, or Cisco
CallManager restarting.
Workaround:
While there are no workarounds available on the Cisco CallManager to
eliminate DoS attacks, securing the voice network with Cisco CallManager
security best practices may lessen the risk or mitigate the effects of
these vulnerabilities. By using access lists and rate limiting to control
access to the Cisco CallManager, the risk of successful attack is greatly
reduced. Cisco provides Solution Reference Network Design (SRND) guides to
help design and deploy networking solutions, which can be found at:
<http://www.cisco.com/warp/public/779/largeent/it/ese/srnd.html>
http://www.cisco.com/warp/public/779/largeent/it/ese/srnd.html
ADDITIONAL INFORMATION
The original article can be found at:
<http://www.cisco.com/warp/public/707/cisco-sa-20060118-ccmdos.shtml>
http://www.cisco.com/warp/public/707/cisco-sa-20060118-ccmdos.shtml
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