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Severity
High
Title
SIP Multimedia PC Client Unlimited Session DoS
Description
Nortel SIP Multimedia PC Client allows workers which are not deskbound to benefit from the same multimedia telephony experience regardless of their location.
Due to the client not implementing any limitation in the number of connections or active windows which can be spawned it is possible for an unauthenticated malicious user to exhaust resources on a given client by creating a very large number of sessions until the system can no longer handle the load leading to a Denial of Service (DoS) against the client system. Details
Category
Denial of Service
Vendor
Nortel
Product
SIP Multimedia PC Client 4.x
Released
2008-06-25
updated
2008-06-25
Response
Attempting to address the issue
Recommendations
To completely address the issue requires a patch from Nortel. Currently no additional information is being provided by Nortel on the timing or availability of patches for the issue. Nortel customers with a valid support agreement may wish to speak with their support contact in order to obtain additional vendor details.
In the short term it is recommended that a VoIP aware IPS product, such as VoIPguard, with signatures to detect attempts to exploit this issue, be implemented to prevent it from being exploited. In addition, implementation of general best practice guidance such as controlling access to telephony networks via VLANs, access control lists, firewalls, network admission controls and/or other security devices will aid in limiting the exposure of this vulnerability.
Due to the client-centric nature of this issue centralized monitoring and protection for this issue may be difficult, therefore any monitoring that can be conducted within the switching infrastructure should also be attempted. Tracking Id
VSRNT-2008-007
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Each line represents an individual vulnerability or group of vulnerabilities. For example, "UCM Multiple Hardcoded Passwords" is presented here in a single line but was reported to Nortel as sixteen (16) individual vulnerabilities.
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