New Rowhammer Attack Variant Out
May 26, 2021 11:11 GMT
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Rowhammer Attacks
A Google team of security researchers demonstrated another form of the Rowhammer attack that circumvents all known safeguards to modify data stored in memory.
The new Rowhammer approach, dubbed Half-Double, is based on weak coupling between two rows of memory that are not directly neighboring but are one row apart.
Researchers noted, "Unlike TRRespass, which exploits the blind spots of manufacturer-dependent defenses, Half-Double is an intrinsic property of the underlying silicon substrate".
"This is likely an indication that the electrical coupling responsible for Rowhammer is a property of distance, effectively becoming stronger and longer-ranged as cell geometries shrink down. Distances greater than two are conceivable".