Boffins demonstrate Rowhammer memory meddling on AMD DDR4 hardware
Boffins from ETH Zurich – Patrick Jattke, Max Wipfli, Flavien Solt, Michele Marazzi, Matej Bölcskei, and Kaveh Razavi – have devised a way to induce bit flips on AMD Zen 2 and Zen 3 systems with DDR4 memory despite the deployment of a defensive technique called
The researchers say they achieved a high number of bit flips on both Zen 2 and Zen 3 systems, with Zen 3 being more vulnerable than Intel's Coffee Lake hardware."We can build the page table, RSA public key corruption, and sudo exploits from prior work on 7/6/4 of these devices, taking, on average, just 164/267/209 seconds," they claim in an explanatory note.memory probing tool.
ZenHammer is also a local attack. The threat model assumes the attacker knows the CPU model of the target machine and has obtained DRAM address mappings using a reverse engineering tool. It also assumes that an unprivileged attacker can execute programs on the victim's machine.
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