Lateral Movement (Telecom)

In telecom networks, Lateral Movement is the post-compromise progression of an attacker across systems, for example from an exposed OAM jump host to network function management interfaces, from there to signaling nodes, and then to roaming-facing perimeters. East-west segmentation, PAM, and detection of unusual NF-to-NF or OAM-to-NF flows limit lateral movement.

Categories: Core NetworkSignalingRoaming and Interconnect

Lateral Movement (Telecom) in context

The mobile core is where subscriber sessions, mobility and policy live. In 4G it is the EPC (MME, HSS, S/PGW); in 5G it is the Service-Based Architecture with AMF, SMF, UPF, AUSF, UDM and the NRF. Core exposure is the difference between a single-subscriber leak and a fleet-wide breach.

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.

To place Lateral Movement (Telecom) in the wider telecom-security picture, review Defense in Depth, GTP-U Smuggling, FS.21, SEPP, Pentest and Red Team Exercise.

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