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Assessment Title
Rule Text
The Session Border Controller (SBC) must filter inbound SIP and AS-SIP traffic based on the IP addresses of the internal Enterprise Session Controller (ESC), Local Session Controller (LSC), or Multifunction Soft Switch (MFSS).
Description
Discussion Text
The SBC is in the VVoIP signaling between the LSC and MFSS. To limit exposure to compromise and denial of service, the SBC must only exchange signaling messages using the designated protocol (AS-SIP-TLS) with the LSC(s) within the enclave and the SBC fronting the MFSS (and its backup) to which the LSC is assigned.
Similarly, an SBC fronting an MFSS must only exchange signaling messages with the MFSS and LSC(s) within the enclave and the SBCs fronting other MFSSs and the LSCs assigned to it.
While the SBC is also required to authenticate the source and integrity of the signaling packets it receives, filtering on source IP address adds a layer of protection for the MFSS. This is also a backup measure in the event this filtering is not done on the CE-R.
Internal to the enclave, filtering signaling traffic based on the IP address(es) of the LSC(s) within the enclave limits the ability of rogue Voice Video Endpoints attempting to establish calls or cause a denial of service.
Similarly, an SBC fronting an MFSS must only exchange signaling messages with the MFSS and LSC(s) within the enclave and the SBCs fronting other MFSSs and the LSCs assigned to it.
While the SBC is also required to authenticate the source and integrity of the signaling packets it receives, filtering on source IP address adds a layer of protection for the MFSS. This is also a backup measure in the event this filtering is not done on the CE-R.
Internal to the enclave, filtering signaling traffic based on the IP address(es) of the LSC(s) within the enclave limits the ability of rogue Voice Video Endpoints attempting to establish calls or cause a denial of service.
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