https://safirsoft.com DDR4 memories are more vulnerable to Rowhammer attacks than previously thought

Fozzer researchers create potentially dangerous exploits to flip bitcoin.
Now available in almost all DDR4 modules. Makers added chips to make their products more resistant to such attacks.

Rowhammer attacks work by hitting physical rows inside weak chips - or knocking them millions of times per second, causing fragments of adjacent rows to bounce, meaning 1 becomes zero and vice versa. Researchers have shown that these attacks can be targeted or infected to grant nearly unlimited system privileges to untrusted apps, bypassing security boxes designed to prevent malicious code from accessing sensitive operating system resources and, among other things, Android devices.

Read simply by thinking more. DDR4 memory has been shown to be vulnerable to Rowhammer

All of the previous Rowhammer attacks have hit rows with uniform patterns such as one-sided, two-sided, or n-sided. In all three cases, these "aggressor" rows - meaning those rotating bits in the nearby "victim" rows, are reached in equal numbers. Rowhammer access patterns from previous work Rowhammer access patterns from the order of prior action presentation spatial rows of attacker (in black) and victim rows (in orange and cream) in DRAM. Gatke et al relative activation frequency, eg, number of ACTIVATE in each Rowhammer style attack. Note how evenly attackers are hit. Relative activation frequency, eg , the number ACTIVATE in each Rowhammer pattern attack row. Note how evenly they beat the attackers. Gatke et al

Bypass all cuts within dynamic memory

Research released on Monday introduced the new Rowhammer technique. Uses non-uniform patterns It reaches two or more rows of attackers with different frequencies.Conclusion: All 40 randomly selected DIMMs in an experimental set experienced bit fluctuations, compared to 13 of 42 chips tested in previous researchers' work.

"We generated access patterns We particularly remember that Kaveh Razavi and Patrick Jatke, two of the authors of this study, wrote in an email: “We can avoid all reductions used in DRAM. According to our analysis, this increases the number of devices that can be compromised by known attacks to 80%.” “These issues are beyond repair due to the nature of their devices and will be with us for years coming." Advertising

Non-uniform patterns work against Target Row Refresh. In short, TRR varies from vendor to vendor, but generally keeps track of how many times a queue is reached and charges a nearby victim queue if there are signs of abuse. Neutralizing this defense puts more pressure on chipmakers to reduce the range of attacks that many people thought newer types of memory chips were resistant to.

in an article on Monday. Only the downside between Rowhammer and attackers, which can be exploited in a variety of scenarios, such as browsers, mobile phones, the cloud, and even network abuse, the researchers wrote. In this paper, we show how deviations from Rowhammer's uniform access patterns allow attackers to return bits in all 40 recently acquired DDR4 DIMMs 2.6% longer than they are now. The effectiveness of these new, non-uniform patterns in circumventing the TRR highlights the need for a more principled approach to dealing with Rowhammer. In one case, researchers were able to gain unlimited access to all of physical memory by flipping through the bits at the entrance to the page table, which map the locations of memory addresses. The same research also showed how untrusted programs can gain root privileges. In another case, the researchers used Rowhammer to remove a 2048-bit encryption key from memory. One of their students was able to use a new approach to reproduce a cryptographic key attack, Razavi and Gateki said. Simulations show that other attacks are possible. The researchers did not fully implement the previous attacks due to the large amounts of engineering required.

The researchers implemented uneven access patterns using built-in Pfizer, a program that detects errors. By automatic injection of pseudorandomly distorted data into a piece of hardware or software. The researchers then referred to Blacksmith, aka Fuzzer, as a broad family of DDR4 modules that make up about 94% of the DRAM market. Devices covering three major manufacturers (Samsung, Micron and SK Hynix), including 4 that the manufacturer has not reported. We allowed the blacksmith's smelter to run for 12 hours to assess its ability to find effective patterns. Next, we swept the best pattern (based on the number of total bits recovered) into a 256MB cache and reported the number of bits. The results in Table 1 show that our Blacksmith fuse is capable of activating bits on all 40 DRAM devices with a large number of bit cycles, especially on [two unknown carriers].

We also have the ability to these bits based on three attacks from previous work: an attack targeting the Page Table Entry page number (PTE) to point it at the attacker-controlled page table, and an attack on the RSA-2048 public key that allows You to retrieve the associated private key used to authenticate the SSH host and attack the password authentication logic of the sudoers.so library, which allows for root privileges.

Micron, Samsung, and Hynix have done just that. Do not respond to emails requesting comment on this post. Advertising

is accelerating gradually

Computers, laptops and mobile phones are more efficient. New findings from cloud services like AWS and Azure are largely safe from Rowhammer, because they use high-quality chips that include a defense called ECC, which stands for Error Correction Code. The protection works by using words known as memory words to store additional controllers along with the data bits inside the DIMM. Processors use these words to quickly identify and fix bits.

ECC was originally designed to protect against natural phenomena in which cosmic rays return bits in newer DIMMs. After the emergence of Rowhammer, the importance of the ECC increased when it proved to be the most effective defense. But research published in 2018 showed that, contrary to what many experts believe, ECC can be bypassed after reverse engineering to reduce DDR3 DIMMs.

It will be more exploitable than reverting. Researchers at Razavi and Jatke said ECC Performance Engineering.

In addition to Razavi and Jatke from ETH Zurich, the research support team includes Victor van der Vienna from Qualcomm, Pietro Frigo from VU Amsterdam, and Stein. Gunter's paper title: BLACKSMITH: Frequency band gradients.

They pointed out. A solution that does not provide complete protection” against Rowhammer. The researchers also said that refresh rate doubles overall performance and power consumption. Attacks over the years could one day change.

“In the end, our work confirms the claims of DRAM vendors About Rowhammer protection is an error, leading you to a false sense of security.” The researchers wrote. “Not all speed reducers are currently sufficient for full Rowhammer protection. "Our new patterns show that attackers can exploit systems more easily than previously thought."

DDR4 memories are more vulnerable to Rowhammer attacks than previously thought
ddr4-memories-are-more-vulnerable-to-rowhammer-attacks.html

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