The Session Border Controller (SBC) must be configured to only process packets authenticated from an authorized source within the DISN IPVS network.
An XCCDF Rule
Description
<VulnDiscussion>The function of the SBC is to manage SIP and AS-SIP signaling messages. The SBC also authenticates SIP and AS-SIP signaling messages, ensuring they are from an authorized source. DOD policy dictates that authentication be performed using DOD PKI certificates. This also applies to network hosts and elements. SIP and AS-SIP are not secure protocols. The information passed during a call session is in human-readable plain text. To secure SIP and AS-SIP, TLS is used. TLS is PKI certificate-based and is used for AS-SIP message encryption, authentication, and integrity validation. NOTE: Authentication is provided by validating the sending appliance's public PKI certificate used to establish the TLS session. AS-SIP messages are not sent until the authenticated TLS session is established.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-259929r948775_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
Ensure the DISN NIPRNet IPVS SBC is configured to only process packets authenticated from an authorized source as follows:
- Authenticate outbound SIP and AS-SIP messages as being from the primary or backup LSC (or the site's MFSS and is backup LSC) within the enclave.
- Authenticate inbound SIP and AS-SIP messages as being from the SBC at the enclave's assigned primary and secondary (backup) MFSS sites.
NOTE: The VVoIP system may allow SIP and SRTP traffic encrypted and encapsulated on port 443 from cloud service providers.