Billing Bypass







Risk Rating:


In both SIP and H.323, the signaling layer does not have real control of media streams. That is, in some cases an attacker may be able to fool the signaling protocols (in charge of recording the CDRs for billing purposes) to make free or cheap calls.

Depending on network architecture and configuration, the attacker may be able to bypass filters and QoS limitations to make direct free calls (billing bypass through SIP proxy server bypass) or to make cheap calls mounting timing attacks and abusing the SIP TTL-like Max-Forwards header (billing is being interrupted, but the call is still active). Finally, fast media and slow signaling may also have security implications and determine exploitable race conditions.

These attacks may compromise the integrity requirement of the CIA paradigm and lead to toll fraud.

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