Hjem » Nyheder » Forskere lærte Rowhammer at stjæle data

Forskere lærte Rowhammer at stjæle data

Et hold af forskere fra USA, Australien og Østrig udviklet en ny version af Rowhammer angreb.

dennlike previous versions, a new attack called RAMBleed allows not only modifing data and increase privileges, men også stjæle data gemt på enheden.

Rowhammer er en udnytte klasse til hardware sårbarhed (CVE-2019-0174) i moderne hukommelseskort. Som standard, data in memory cards is stored in cells located on a silicon chip in rows forming a grid.

I 2014, scientists found that multiple readings of data stored in the same row result in an electrical charge that can affect data in adjacent rows. The attack was called Rowhammer, and with its help, scientists could either damage data or use it for malicious purposes.

If hundreds and thousands of times in a split second to access specific lines of memory, derefter, as a consequence of certain physical phenomena, this may affect the neighboring memory area.
If hundreds and thousands of times in a split second to access specific lines of memory, derefter, as a consequence of certain physical phenomena, this may affect the neighboring memory area.

Siden 2014, researchers significantly expanded capabilities of the original attack, imidlertid, it was only now possible to remove data from the memory and steal it.

“It is widely assumed however, that bit flips within the adversary’s own private memory have no security implications, as the attacker can already modify its private memory via regular write operations. We demonstrate that this assumption is incorrect by employing Rowhammer as areadside channel. More specifically, we show how an unprivileged attacker can exploit the data dependence between Rowhammer induced bit flips and the bitsin nearby rows to deduce these bits, including values belonging to other processes and the kernel”, - rapport forskere.

In order to make RAMBleed attack possible, scientists managed to force Linux memory allocator (buddy allocator) to enable a large block of consecutive physical addresses that allowed them to orchestrate the attack.

LÆS  Scoped Opbevaring vil ikke beskytte Android Q

Researchers created a new mechanism, “Frame Feng Shui“, to place victim’s program pages in the right place in physical memory. Desuden, they developed a new method of managing data in memory and repeating their reading (so-called row hammering) to determine which data is in neighboring memory cells.

“Thus, primary contribution of this work is to show that Rowhammer is a threat to not only integrity, but also to confidentiality”, — say scientists.

Kilde: https://rambleed.com/docs/

[i alt: 0    Gennemsnit: 0/5]

Om Trojan Killer

Carry Trojan Killer Portable på din memory stick. Vær sikker på, at du er i stand til at hjælpe din pc modstå eventuelle cyber trusler, hvor du går.

Tjek også

GandCrab hovednøgler

FBI frigivet hovednøgler at dekryptere alle Gandcrab versioner

The FBI has released master keys to decrypt files affected by Gandcrab ransomware versions 4, …

Emotet trojan

Global Threat Indeks: Emotet botnet suspenderet sine aktiviteter

Check Point Research hold (en division af Check Point) published a Global Threat

Skriv et svar