
ROOTECSTAK🛡️👾
February 15, 2025 at 12:50 PM
*DID YOU KNOW?*
Rowhammer exploits bit flips in DRAM to gain arbitrary memory access, even bypassing Error-Correcting Code (ECC) memory.
*Quick Exploit* : Flip Bits via One-Location Rowhammer
1. Map a large chunk of DRAM and repeatedly access adjacent rows:
for (int i = 0; i < 1000000; i++) {
*(volatile int*)addr1;
*(volatile int*)addr2;
}
2. Check for bit flips in protected memory regions.
3. Use privilege escalation tricks (e.g., flipping sudo permissions in /etc/sudoers).
*Mitigation:*
1. Use Target Row Refresh (TRR) memory modules, which block excessive row accesses.
2. Enable DRAM encryption (AMD SME, Intel TME) to prevent Rowhammer-induced bit flips.
3. Deploy CPU-assisted mitigations like ARM PACs (Pointer Authentication Codes).