Insider Threat

Insider threat is the risk that an individual with legitimate access to systems, employee, contractor, third-party support, uses that access maliciously or negligently. In telecom it is particularly impactful because insiders may reach subscriber data, lawful-interception capabilities, or signalling control planes. Mitigations include least privilege, separation of duties, and behavioural monitoring.

Categories: SignalingIdentity and SubscriberThreats and Attacks

Insider Threat in context

Signaling protocols carry the control-plane instructions that set up calls, register subscribers, hand over sessions and route SMS. SS7, Diameter, GTP-C and SIP are the four dominant families, and interconnect exposure of any of them is treated by GSMA FS.11 / FS.19 / FS.20 as a top-tier telecom risk.

Subscriber identifiers (IMSI, SUPI, MSISDN, IMEI) are the anchor for authentication, charging, lawful interception and fraud analytics. Any protocol or interface that leaks a permanent identifier is treated as a serious privacy defect, which is why 5G introduced SUCI concealment on the air interface.

To place Insider Threat in the wider telecom-security picture, review IAMF, SS7, Traffic Baselining, GMLC, Behavioral Signaling Detection and Event Logging.

Related terms

Related topic hubs

  • SS7 Security SS7/MAP/CAP/SCCP attacks and defenses across 2G/3G interconnect.
  • Diameter Attacks S6a IDR/PUR/CLR abuse, subscriber tracking, LTE signaling attacks.
  • Signaling Firewall Unified SS7/Diameter/GTP/SMS signaling firewall framework.

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