New Noise-Resilient Attack On Intel and AMD CPUs Makes Flush-based Attacks Effective – Tempemail – Blog – 10 minute

Modern Intel and AMD processors are susceptible to a new form of side-channel attack that makes flush-based cache attacks resilient to system noise, newly published research shared with The Hacker News has revealed.
The findings are from a paper “DABANGG: Time for Fearless Flush based Cache Attacks” published by a pair of researchers, Biswabandan Panda and Anish Saxena, from the Indian Institute of Technology (IIT) Kanpur earlier this week.
Dubbed “Dabangg” (meaning fearless), the approach builds upon the Flush+Reload and Flush+Flush attacks, which have been exploited previously by other researchers to leak data from Intel CPUs.
However, the new variant aims to improve the accuracy of these attacks even in a noisy multi-core system. It also works seamlessly against non-Linux Operating Systems, like macOS.
“Like any other cache attacks, flush based cache attacks rely on the calibration of cache latency,” Biswabandan Panda, assistant professor at IIT Kanpur, told The Hacker News. “State-of-the-art cache timing attacks are not effective in the real world as most of them work in a highly controlled environment.”
“With DABANGG, we make a case for cache attacks that can succeed in the real world that’s resilient to system noise and work perfectly even in a highly noisy environment,” he added.

Flush+Reload and Flush+Flush attacks work by flushing out the memory line (using the “clflush” instruction), then waiting for the victim process to access the memory line, and subsequently reloading (or flushing) the memory line, measuring the time needed to load it.
DABANGG is a lot like Flush+Reload and Flush+Flush attacks in that it’s a flush-based attack, which depends on the execution timing difference between cached and non-cached memory accesses. But unlike the latter two, DABANGG makes the thresholds used to differentiate a cache hit from a miss dynamic.
Power management techniques like dynamic voltage and frequency scaling (DVFS) in modern processors allow for frequency changes based on overall CPU utilization, with cores running compute-intensive processes operating at a higher frequency than those that do not.

This core-wise frequency difference results in a variable execution latency for instructions, and renders the thresholds chosen to distinguish a cache hit from a miss useless, the researchers stated.
“We make these thresholds dynamic as a function of processor frequency (that gets throttled up and down based on the DVFS controllers) which in turn make the flush based attacks resilient to system noise,” Prof. Panda said.
DABANGG refines the shortcomings by capturing the processor’s frequency distribution in the pre-attack stage and using a compute-heavy code to stabilize the frequency, before proceeding with a Flush+Reload or Flush+Flush attack to calculate latency and check for a cache hit.

The consequence of these side-channel attacks is a reliable way to eavesdrop on user input, extract AES private key, exfiltrate data via a covert channel between a malicious process and its victim, and carry out Spectre-like speculative execution to access cached information.
Given that DABANGG is also a flush-based attack, it can be mitigated using the same techniques corresponding to Flush+Reload and Flush+Flush, namely, modifying the clflush instruction and monitoring cache misses as well as making hardware changes to prevent such attacks.
“Flush-based attacks must be aware of processor frequency for better accuracy,” Prof. Panda said. “Generally speaking, if an attack cannot effectively target a victim’s access unless all the conditions are controlled, that attack doesn’t pose a real-world risk. We believe this is just the beginning in terms of pushing the cache attacks into the real world, and it will trigger better and more robust cache attacks in the future.”
Researchers will release the source code for proof-of-concept on Github after 15th June 2020.

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AMD discounts its Ryzen 3000 CPUs, gives away Xbox Game Pass with select models – Blog – 10 minute

What just happened? If you’re in the market for a new AMD CPU, now might be a great time to buy. The company has announced a new promotion that not only cuts the price of its 3000-series processors but also includes a free Xbox Game Pass with some models.
Ranging from the Ryzen 9 3900X, which we scored 90 in our review, to the fantastic value-for-money Ryzen 3600 (Techspot score: 100), the discounts range from $25 to $50. They’re available now from Newegg and Amazon in North America only and will last throughout the month of March.
Another incentive on offer is a three-month Xbox Game Pass. Usually costing $29.99, it grants access to PC games such as Halo: The Master Chief Collection, Forza Horizon 4, Gears 5, and over 100 other titles. The Game Pass is included with the Ryzen 9 3900X, Ryzen 7 3800X, and Ryzen 7 3700X, but only while supplies last.

It’s worth noting that these discounts apply to AMD’s recommended prices, so the CPUs that are already selling below the MSRP have even more money off. The Ryzen 9 3900X, for example, is down to $419 on Amazon and Newegg, while the Ryzen 7 3800X is $339.
Here are the discounted models:
Earlier this month, AMD updated its CPU roadmap, revealing the arrival of Zen 3, Zen 4, and 5nm.

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Intel CPUs are vulnerable to new “LVI” attack that breaks the secure enclave of the CPU – Blog – 10 minute

A hot potato: Hot on the heels of a recently-discovered vulnerability in Intel’s Converged Security and Management Engine, the security community has found yet another worrisome attack method that can be levied at x86 silicon used in millions of machines around the world. Researchers have discovered yet another flaw in Intel’s CPU silicon that warrants a hardware redesign to fully solve the underlying issues. Called LVI, it’s very similar to the Meltdown and Spectre vulnerabilities that were disclosed in 2018.
To put things in context, 2018 was the year when the infamous Meltdown and Spectre attacks were disclosed to the public. Meltdown allows hackers to access memory that should theoretically be inaccessible, while Spectre makes it easy to alter branch prediction structures in order to execute malicious code.
In a collaborative analysis made by Bitdefender and an academics team led by Jo Van Bulck, we get to see the complicated details of a new attack method that’s potentially worse. It is called Load Value Injection (LVI), and it’s part of a new class of attacks on Intel CPU’s speculative execution.
This new method allows an attacker to take advantage of a feature present in most modern CPUs that can essentially achieve higher performance by guessing the future instructions that are likely to be thrown at it and preparing a set of results. Once the instructions are confirmed the wrong results are discarded.
Researchers were able to use LVI to do what is essentially Meltdown in reverse
LVI is something that an attacker can do to get your CPU to spit out the bits of data that should technically be securely stored through Intel’s Software Guard Extensions (SGX). Pretty much any application that works with passwords, digital rights management, and encryption keys uses SGX to run code and keep data inside an isolated environment.

If your machine happens to have an OS or firmware vulnerability, SGX should normally compensate for that. Researchers were able to use LVI to do what is essentially Meltdown in reverse: they inject data to poison a hidden CPU buffer with custom data values that makes it easier to access data used by an app. From there, there’s nothing stopping an attacker from gaining access to a higher-privileged process and achieving a broad impact on personal and work computers.
Bitdefender researchers explain that “this type of attack is particularly devastating in multi-tenant environments such as enterprise workstations or servers in the data center, where one less-privileged tenant would be able to leak sensitive information from a more privileged user or from a different virtualized environment on top of the hypervisor.” Here it is in action:

The good news for you is that you probably shouldn’t worry all that much, since this new attack method is more complex and a cloud environment would be a more suitable target. The list of affected processors includes an assortment of different models ranging from 4th-gen Xeons to 10th-gen Comet Lake Core CPUs. Interestingly, CPUs based on the Ice Lake architecture are not affected.
The bad news for enterprises is that they’ll have to assess the risks and implement a number of software mitigations. Intel will supply microcode patches, but some organizations may also opt to disable features like hyper-threading in critical systems. Researchers also note that besides the expensive software patches needed, Intel’s SGX enclave will run between 2 to 19 times slower as a result of the necessary mitigations.
For its part, Intel is downplaying the severity of LVI due to the sophistication level required to perform such an attack. The Bitdefender report seems to support that assessment, but Intel will still have to make improvements in its future silicon before malicious actors can come up with similar attacks that are more practical for real-world use.
In related news, AMD’s CPUs have also been affected by a newly disclosed vulnerability that supposedly carries a similar severity level, though the company has heavily downplayed its importance.

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New Intel CPUs Vulnerability Puts Data Centers At Risk – Tempemail – Blog – 10 minute

It appears there is no end in sight to the hardware level security vulnerabilities in Intel processors, as well as to the endless ‘performance killing’ patches that resolve them.
Modern Intel CPUs have now been found vulnerable to a new attack that involves reversely exploiting Meltdown-type data leak vulnerabilities to bypass existing defenses, two separate teams of researchers told The Hacker News.
Tracked as CVE-2020-0551, dubbed “Load Value Injection in the Line Fill Buffers” or LVI-LFB for short, the new speculative-execution attack could let a less privileged attacker steal sensitive information—encryption keys or passwords—from the protected memory and subsequently, take significant control over a targeted system.

According to experts at Bitdefender and academic researchers from a couple of universities, the new attack is particularly devastating in multi-tenant environments such as enterprise workstations or cloud servers in the datacenter.
And, that’s because a less-privileged rouge tenant could exploit this issue to leak sensitive information from a more privileged user or from a different virtualized environment on top of the hypervisor.

Intel CPUs ‘Load Value Injection’ Vulnerability

Unlike previously disclosed Intel chipset vulnerabilities—including Meltdown, Spectre, and MDS—where an attacker speculatively access the memory, buffer data or sniffs the data when the victim accesses it, the new LVI-LFB attack involves attacker injecting malicious data into the buffers that victim program unwillingly uses during the speculative execution.

“The attacker sprays the LFBs with the address of a malicious function, and when the victim issues an indirect branch through memory which requires a microcode assist, the address of the malicious function is loaded from the LFBs, thus leading to the attacker function being speculatively executed,” Bitdefender researchers told The Hacker News.

Though the latest flaw is a new variant of MDS attacks, it can’t be mitigated with existing patches for previously disclosed Meltdown, Foreshadow, ZombieLoad, RIDL, or Fallout speculative-execution attacks.

“It combines Spectre-style code gadgets in the victim application with Meltdown-type illegal data flow from faulting or assisted memory load instructions to bypass existing defenses and inject attacker-controlled data into a victim’s transient execution,” the researcher Jo Van Bulck and his team said in a detailed paper.

As illustrated in the image above, the LVI attack can be executed in 4 simple steps:

Poison a hidden processor buffer with attacker values,
Induce faulting or assisted load in the victim program,
The attacker’s value is transiently injected into code gadgets following the faulting load in the victim program,
Side channels may leave secret-dependent traces before the processor detects the mistake and rolls back all operations.

In other words, when the victim actively tries to execute some code, and the attacker can actively fill the MDS buffers with carefully chosen values to influence the execution of the victim thread.

PoC Exploit Demo and Security Patches

According to researchers, there are several possible scenarios to exploit the LVI-LFB based control flow hijacking attack, such as: influencing an address that is accessed, the offset within an accessed buffer, the result of a conditional branch, or affecting the destination of an indirect branch.
“LVI based control flow hijacking allows an attacker to trick the victim into speculatively executing a function of his choosing. This works, theoretically, across all security boundaries: process to process, user-mode to kernel-mode, guest-mode to root-mode, and perhaps even user-mode to enclave,” Bitdefender researchers said.
Both teams of researchers have also developed proof-of-concept exploits, one of which could let attackers compromise the security of Intel SGX enclaves is now available on GitHub.

Other than Intel, though researchers haven’t tested AMD or ARM processors, they hinted that “in principle, any processor that is vulnerable to Meltdown-type data leakage would also be vulnerable to LVI-style data injection.”
Jo Van Bulck lead team reported this flaw to the Intel team almost a year ago, whereas Bitdefender reported it just last month immediately after discovering it independently.
Intel has acknowledged these findings and today released a list of all affected products on its website along with the information on microcode security patch updates.
However, since the hardware flaws cannot be eradicated with software patches and flushing affected buffers are no longer sufficient, researchers suggest affected users to either disable rich performance features like hyper-threading, or replace the hardware to completely avoid such vulnerabilities.

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Intel’s 10th-gen Comet Lake desktop CPUs might not arrive until June – Blog – 10 minute

Rumor mill: Intel is rumored to finally release its 10th generation Comet Lake desktop chips next month, but the CPUs could be another product delayed by the coronavirus disruption, according to a new report.
While the Comet Lake laptop processors arrived last summer, the launch date of the desktop versions is still a mystery. But we now might have a better idea of when they’ll arrive, thanks to Unikoshardware.com, which has posted pictures of the Intel Core i5-10400 and a slide from the company.

The interesting part of the slide is the ‘Product Introduction Date (Press embargo)’ section, which reads: “Press News Embargo: April 13 – June 26, 2020.”
We don’t know if the slide is genuine, so take this with a pinch of salt, but it suggests there is no set embargo date for the chips’ launch. That could mean Intel is anticipating missing the April release date, with the CPUs potentially not launching until June.
If there really is a delay, it can almost certainly be attributed to the coronavirus. As noted by Tom’s Hardware, it wouldn’t make sense for Intel to release the chips if its partners can’t produce supporting motherboards in time.
The more optimistic and likely alternative is that Intel will be officially announcing the Comet Lake desktop chips on April 13, before introducing the various CPUs between then and June 26, each one with its own embargo date.
We’re expecting to see over twenty 10th-gen Comet Lake desktop chips, including the 10-core/20-thread i9-10900K that replaces the i9-9900K. Leaks say the flagship CPU will feature 125W TDP, a base frequency of 3.7GHz, and boost to 5.1GHz. The chips will have hyperthreading enabled from the most expensive model all the way down to the Pentium G6400T, unlike the current-gen CPUs, where it’s only on the i9 series.

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AMD CPUs are vulnerable to a severe new side-channel attack – Blog – 10 minute

Cutting corners: All AMD processors released since 2013 are vulnerable to a pair of new side-channel attacks, “Collide + Probe” and “Load + Reload.” Both exploit weaknesses in AMD’s L1D cache way predictor, a tool that predicts where data is stored in the processor, to detect when that data is accessed. By combining the new exploits with existing methodologies, researchers from the Graz University of Technology were able to crack open all the secrets of AMD processors in labs and real-world servers.
Processors run a lot of software concurrently and essential to systems’ security is keeping programs separate so that one can’t see what the other is doing, but new research into AMD’s processors has uncovered flaws that allow data to be shared between programs running on the same core.
“The key takeaway of this paper is that AMD’s cache way predictors leak secret information,” says the research paper from the Austrian team.
In both new exploits, collectively called “Take A Way” flaws, attacking software begins by picking an address corresponding with the target data’s address. The attacker then accesses the data stored in their version of the address, but that creates a link based on the address within the cache and the way predictor. The route the processor will take to access that address next time is guaranteed to be quite quick. But if the address is triggered a third time, then the processor will get to it slowly.
All the attacker has to do, then, is bring up that address at regular intervals. If it comes up quick then the victim hadn’t accessed it during the interval, but if it takes a while, it was accessed. This allows the attacker to monitor when the victim accesses data stored within the processor, without knowing where that data is, and without the requirement of sharing memory with the victim.

From there the researchers paired the exploits with existing attack patterns and weaknesses to stir up some trouble. They constructed a covert channel between two pieces of software that are not meant to be able to communicate. They were able to break ASLR (address space layout randomization) which is a key step in accessing processor memory. Subsequently, they were able to leak kernel data and even crack AES encryption keys.
In short, that’s the better part of the processor cracked open. It’s not easy to do, and it involves combining a lot of different exploits in some complex ways, but it’s possible. AMD has yet to respond to the paper’s allegations, and perhaps most importantly, announce if this can be fixed via a firmware update and at what kind of performance cost. The flaws reportedly affect some older Athlon CPUs as well as all Ryzen and Threadripper processors.
There are quite a few of these hardware exploits out and about, though most of them up until now have targeted Intel processors. There haven’t been any attacks recorded in the wild yet. Furthermore, defenses against this specific attack shouldn’t be too difficult to implement according to the researchers. The team claims they notified AMD of their findings last August, so the company has had a long time to react and hopefully have a software update to remedy most of the issues soon. They do suggest that a watertight seal might involve physical updates to the architecture though.
Masthead Credit: Michael Dziedzic on Unsplash

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This Unpatchable Flaw Affects All Intel CPUs Released in Last 5 Years – Tempemail – Blog – 10 minute

All Intel processors released in the past 5 years contain an unpatchable vulnerability that could allow hackers to compromise almost every hardware-enabled security technology that are otherwise designed to shield sensitive data of users even when a system gets compromised.
The vulnerability, tracked as CVE-2019-0090, resides in the hard-coded firmware running on the ROM (“read-only memory”) of the Intel’s Converged Security and Management Engine (CSME), which can’t be patched without replacing the silicon.
Intel CSME is a separate security micro-controller incorporated into the processors that provides an isolated execution environment protected from the host opening system running on the main CPU.

It is responsible for the initial authentication of Intel-based systems by loading and verifying firmware components, root of trust based secure boot, and also cryptographically authenticates the BIOS, Microsoft System Guard, BitLocker, and other security features.
Although this insufficient access control vulnerability is not new and was previously patched by Intel last year when the company described it just as a privilege escalation and arbitrary code execution in Intel CSME firmware modules, the extent of the flaw remained undervalued.
Researchers at Positive Technologies have now found that the issue can also be exploited to recover the Chipset Key, a root cryptographic key or sort of a master password that could help unlock and compromise a chain of trust for other security technologies, including digital rights management (DRM), firmware Trusted Platform Module (TPM), and Identity Protection Technology (IPT).
That means the flaw could be exploited to extract data from encrypted hard-drives and to bypass DRM protections and access copyright-protected digital content.

“Intel’s security is designed so that even arbitrary code execution in any Intel CSME firmware module would not jeopardize the root cryptographic key (Chipset Key),” the researchers said.

“Unfortunately, no security system is perfect. Like all security architectures, Intel’s had a weakness: the boot ROM, in this case. An early-stage vulnerability in ROM enables control over reading of the Chipset Key and generation of all other encryption keys.”

“We believe extracting this key is only a matter of time. When this happens, utter chaos will reign. Hardware IDs will be forged, digital content will be extracted, and data from encrypted hard disks will be decrypted.”

Therefore, the security patches released by Intel are incomplete and can not entirely prevent sophisticated attacks, leaving millions of systems at the risk of digital attacks that are nearly impossible to detect and patch.
Moreover, since the ROM flaw can be exploited by an attacker with physical access before the system even boots up, it can’t be patched with a software update.
“The problem is not only that it is impossible to fix firmware errors that are hard-coded in the Mask ROM of microprocessors and chipsets,” the researchers said.
“The larger worry is that, because this vulnerability allows a compromise at the hardware level, it destroys the chain of trust for the platform as a whole.”
According to researchers, only the latest Intel 10th generation processors, Ice Point chipsets and SoCs, are not vulnerable to this issue.
More precisely, the vulnerability affects Intel CSME versions 11.x, Intel CSME version 12.0.35, Intel TXE versions 3.x, 4.x, and Intel Server Platform Services versions 3.x, 4.x, SPS_E3_05.00.04.027.0.

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AMD CPUs and GPUs will power the future world’s fastest supercomputer, 10x faster than current leader – Blog – 10 minute

Something to look forward to: The ‘El Capitan’ supercomputer at Lawrence Livermore National Laboratory (LLNL) will be built with both AMD processors and GPUs. It is expected to pack more than 2 exaFLOPs of performance and will come online in early 2023. El Capitan will be a huge leap forward in supercomputing performance with more power than the current top 200 fastest systems combined. That is also 10 times faster than the current fastest system.
The new system will be maintained by the US Department of Energy’s (DOE) National Nuclear Security Administration (NNSA). Its main purpose will be to help model how America’s existing nuclear weapons stockpile is aging through simulations and artificial intelligence.
In addition to national security workloads, El Capitan will also target some other key areas. This includes a partnership with the National Cancer Institute and additional DOE labs to accelerate research towards cancer drugs and how certain proteins mutate. El Capitan will also be used in research to help fight climate change.

This system is a big win for both AMD and Hewlett Packard Enterprise (HPE), who designed the system. Supercomputers used to be dominated by Intel CPUs and Nvidia GPUs, but AMD’s improvements in both sectors are starting to eat away at that.
El Capitan will use 4th generation EPYC CPUs, codenamed “Genoa,” based on the Zen 4 architecture. On the GPU side, it will use Radeon Instinct cards with the 3rd generation Infinity architecture.

The compute hardware will be implemented using Cray’s Shasta system and Slingshot interconnect.
This features a 4:1 GPU to CPU ration with local flash storage for improved access speed. To help manage the massive heat generated by such a system, the blades are all individually water cooled. In addition to El Capitan, HPE and DOE are also working on two other exascale systems, Aurora and Frontier.

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Dell video reveals 10th-gen Comet Lake desktop CPUs are on their way – Blog – 10 minute

Highly anticipated: Intel debuted its 10th-generation Comet Lake laptop processors last summer, but we’re still waiting for any official word on the desktop version of these chips. However, a new YouTube video from Dell suggests it won’t be long before they arrive.
In a clip for Dell’s XPS Tower and XPS Tower Special Edition, it’s stated that they feature “10th Gen Intel Core Processors,” marking the first time we’ve seen the non-mobile version of these chips. Sadly, the video has just been set to private, but you can view a screen grab of the reveal above.
There has been the X-Series version, including the $1,000 Core i9-10980XE, but Intel says these are 9th-generation CPUs.
It’s thought that there will be over twenty 10th-gen Comet Lake desktop chips, including the 10-core/20-thread i9-10900K that replaces the i9-9900K. Leaks say the flagship CPU will feature 125W TDP, a base frequency of 3.7GHz, and boost to 5.1GHz.

With these processors, Intel will be looking to take on AMD and its third-generation Ryzen CPUs. Team Red has been chipping away at its rival’s desktop CPU market share for years, so Intel will be hoping to get back in the game with Comet Lake. The chips will have hyperthreading enabled from the i9-10900K all the way down to the Pentium G6400T, unlike the current-gen, where it’s only on the i9 series. They will also be more competitively priced against Ryzen.
Intel will have its work cut out, though. For a start, while AMD is down to 7nm, Comet Lake is based on a refined version of the 14-nanometer process Intel’s been using since Skylake, meaning they’ll have a higher power draw—up to 300W at maximum load. And with the latest Intel chips rumored to arrive in April, it won’t be too long before they’re competing against the fourth-gen Ryzen series, which launch sometime in Q3.

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LEAKED: Intel’s Latest 10th Generation Desktop CPUs – Tempemail – Blog – 10 minute

Sourced from Unsplash.

The specifications of Intel’s new 10th-generation Comet Lake F-series desktop processors have apparently leaked, according to My Broadband via Tom’s Hardware.
Informática Cero, an Uruguayan tech website, discovered the leak. Showing part of a PowerPoint presentation containing the purported leaked information about the new processors.
The F-series chips were first introduced in Intel’s 9th-generation Coffee Lake processors. These chips use the same silicon as non-F-series processors sans integrated graphics functionality.
The leak shows that the company will launch two variants of each of the processors. Three KF processors with a thermal design power of 125W, and three less-powerful F versions with 65W.
The leaked specifications are as follows:
Sourced from Informática Cero
All six processors feature Intel Single Core Turbo capabilities, which is indicated as the Intel Turbo Boost Max speed in the table above.
Intel has recently fallen behind in terms of technology and sales against its largest competitor, AMD.
Not only has AMD launched several processors that employ its 7nm Zen 2 architecture – which is more powerful than any of Intel’s current stock of processors – but AMD’s Ryzen 3000 series of processors have nearly doubled any of Intel’s sales in certain regions.
Intel’s new Comet Lake processors are expected to launch in April 2020.
Edited by Luis Monzon
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