From my understanding, that vulnerability exists only if RDMA is also enabled.
RDMA, the ability to share RAM as if it were local RAM (through a memory-mapped IO mechanism) across Ethernet is not a common setup. The fact that you can perform cache-timing attacks over RDMA + Intel L3 cache is a testament to how efficient the system is if anything.
Consider this interpretation: RDMA + DDIO is so fast, you can perform cache-timing attacks over Gigabit Ethernet(!!). NetCAT (the "vulnerability" you describe) is proof of it.
Cache-timing / side channel attacks aren't exactly the kind of vulnerabilities that most people think of though. Its kinda cool, but its nothing as crazy as Meltdown / Spectre were.
RDMA, the ability to share RAM as if it were local RAM (through a memory-mapped IO mechanism) across Ethernet is not a common setup. The fact that you can perform cache-timing attacks over RDMA + Intel L3 cache is a testament to how efficient the system is if anything.
Consider this interpretation: RDMA + DDIO is so fast, you can perform cache-timing attacks over Gigabit Ethernet(!!). NetCAT (the "vulnerability" you describe) is proof of it.
Cache-timing / side channel attacks aren't exactly the kind of vulnerabilities that most people think of though. Its kinda cool, but its nothing as crazy as Meltdown / Spectre were.