Rasprava i komentari o "Spectre" i "Meltdown" pošastima

[The Exiled]

SgxSpectre Attack Can Extract Data from Intel SGX Enclaves

Intel Software Guard eXtensions (SGX) is a feature of modern Intel processors that allow an application to create so-called enclaves. This enclave is a hardware-isolated section of the CPU's processing memory where applications can run operations that deal with extremely sensitive details, such as encryption keys, passwords, user data, and more. According to researchers, SgxSpectre works because of specific code patterns in software libraries that allow developers to add SGX support to their apps. Vulnerable SGX development kits include the Intel SGX SDK, Rust-SGX, and Graphene-SGX. Intel's recent Spectre patches don't necessarily help, as an attacker can work around these fixes. Intel says an update for the Intel SGX SDK that adds SgxSpectre mitigations will be released on March 16. App developers will need to integrate this new SDK version into their SGX-capable apps and issue an update to users. Apps that implement Google's Retpoline anti-Spectre coding techniques are safe, researchers say.

[Gigi1]

shitshow se i dalje nastavlja, ali bitno da se pisalo da je "bug nepostojeci"

[Tajl3r]

https://newsroom.intel.com/wp-conten...e-guidance.pdf

[Manuel Calavera]

Frend ima neke pizdarije sa win, povuklo mu update za spectre kaže, pa je sad ubacivao neke starije microcodove tj. modao je biose

[The Exiled]

Intel Publishes Spectre & Meltdown Hardware Plans: Fixed Gear Later This Year

Intel is announcing that they have developed hardware fixes for both the Meltdown and Spectre v2 vulnerabilities, which in turn will be implemented into future processors. Both the next version of Intel’s Xeon server/HEDT platform – Cascade Lake – as well as new 8th gen Core processors set to ship in the second half of this year will include the mitigations. Meanwhile for updating Intel’s consumer chips, this is a bit more nebulous. While Intel hasn’t shared the complete text of their announcement with us ahead of press time, their specific wording is that the changes will be included in 8th gen Core processors “expected to ship in the second half of 2018.” Intel hasn’t said what processor family these are (e.g. Cannon Lake?), or for that matter whether these are even going to be traditional consumer chips or just the Core HEDT releases of Cascade Lake.

As for the hardware changes themselves, it’s important to note that Intel’s changes only mitigate Meltdown (what Intel calls “variant 3”) and Spectre variant 2. In both cases the company has mitigated the vulnerabilities through a new partitioning system that improves both process and privilege-level separation, going with a “protective walls” analogy. Unfortunately these hardware changes won’t mitigate Spectre variant 1. And admittedly, I haven’t been expecting Intel (or anyone else) to figure that one out in 2018. The best mitigations for Spectre v1 will remain developer-focused software techniques such as retpoline.

Izvor: AnandTech

[geronimo_2]

it continues...

http://news.softpedia.com/news/after...s-520433.shtml

[The Exiled]

Začarani krug, a zakrpe i dalje rade više štete nego koristi.

[geronimo_2]

http://www.zdnet.com/article/intel-w...n-these-chips/

"it is impractical..."
dirty SOBs

edit: microcode update guidance
https://newsroom.intel.com/wp-conten...e-guidance.pdf

[kopija]

Autor geronimo_2

http://www.zdnet.com/article/intel-w...n-these-chips/

"it is impractical..."
dirty SOBs

Čisto sumnjam da bi proizvođači matičnih starih deset godina izbacili nove biose čak i kada bi Intel izdao microcode update.

[popo1]

Ako netko zna,
ako skinem sa microsoftove stranice zadnju verziju Windowsa 10, da li su u njima ove zakrpe protiv spectre i meltdown bug-a ?
I da li su sa tim zakrpama slabije performanje računala.
Inače, imam i5 kaby lake.
Zahvaljujem

[The Exiled]

AMD Releases Spectre v2 Microcode Updates for CPUs Going Back to 2011

AMD has released CPU microcode updates for processors affected by the Spectre variant 2 (CVE-2017-5715) vulnerability. The company has forwarded these microcode updates to PC and motherboard makers to include them in BIOS updates. Updates are available for products released as far as 2011, for the first processors of the Bulldozer line. The KB4093112 update included in the April 2018 Patch Tuesday contains additional Spectre v2 mitigations, not included with the original January 2018 Patch Tuesday release, which AMD deems necessary to completely mitigate Spectre v2. The company is still preparing patches for the RyzenFall, MasterKey, Fallout, and Chimera vulnerabilities that came to light last month, considered less dangerous and easier to fix than the Meltdown and Spectre flaws.

Izvor: BleepingComputer

Autor popo1

ako skinem sa microsoftove stranice zadnju verziju Windowsa 10, da li su u njima ove zakrpe protiv spectre i meltdown bug-a ? I da li su sa tim zakrpama slabije performanje računala.

Zasad te zakrpe još uvijek nisu integrirane (možda jednog dana budu), ali Windows Update tijekom i nakon instalacije pokupi sve bitno.

Performanse mogu, a i ne moraju biti iste - nažalost ovisi kakve si sreće.

[popo1]

Ok, hvala na odgovoru.

[The Exiled]

Spectre Watch: More Spectre-class CPU Vulnerabilities to be Announced Soon?

Heise.de has published an exclusive report stating that they got wind of a new series of Spectre-class vulnerabilities that are currently being investigated by the greater security community, and that these vulnerabilities are going to be announced in the coming days. Meanwhile, seemingly in response to the Heise article, Intel has just published their own statement on the matter, which they’re calling “Addressing Questions Regarding Additional Security Issues.” Sources point to 8 individual CVE-assigned Spectre-class attacks, which for the moment they’re calling Spectre-NG. According to the site, Intel is working on two waves of patches, with the first wave currently set to be released in May, and Heise is further speculating that information on the first wave will be released just ahead of May’s Patch Tuesday. Meanwhile information on a second flaw could be released “any day now.”

Izvor: AnandTech

[The Exiled]

Google and Microsoft Reveal New Spectre Attack

Security researchers from Google and Microsoft have found two new variants of the Spectre attack that affects processors made by AMD, ARM, IBM, and Intel. Rumors about this new flaw leaked online at the start of the month in a German magazine, but actual details were published today. Impressively, AMD has already released a 5 page whitepaper on the vulnerability, as well as a post on their security updates page outlining that they will be providing updates back to the Bulldozer series of processors. Even more remarkable, is AMD stats that these updates are already in the hands of Microsoft, who is completing final testing and validation and will be released over the standard update process.

The bugs - referred to in the past weeks as SpectreNG - are related to the previous Meltdown and Spectre bugs discovered last year and announced at the start of 2018. Both Google and Microsoft researchers discovered the bug independently. The bugs work similarly to the Meltdown and Spectre bugs, a reason why they were classified as "variant 3a" and "variant 4" instead of separate vulnerabilities altogether.

• Variant 1: bounds check bypass (CVE-2017-5753) aka Spectre v1
• Variant 2: branch target injection (CVE-2017-5715) aka Spectre v2
• Variant 3: rogue data cache load (CVE-2017-5754) aka Meltdown
• Variant 3a: rogue system register read (CVE-2018-3640)
• Variant 4: speculative store bypass (CVE-2018-3639)

Izvor: BleepingComputer

[pci_e3x]

'ajmo izbacit dovoljno patcheva za (namjerne?) sigurnosne rupe u nasim proizvodima. Tako da kada izbacimo nove generacije CPU-a, izgledat ce da su puno brzi od starih.


L1 Terminal Fault - The Latest Speculative Execution Side Channel Attack
"While Meltdown breaks the user space to kernel space protection, L1TF allows to attack any physical memory address in the system and the attack works across all protection domains. It allows an attack of SGX and also works from inside virtual machines because the speculation bypasses the extended page table (EPT) protection mechanism. "
https://www.phoronix.com/scan.php?pa...Terminal-Fault



A Lot Of Spectre Changes Land In The Linux 4.19 Git Tree, Possible Performance Impact
https://www.phoronix.com/scan.php?pa...86-PTI-Spectre


Prije nego netko hate-a Windows, vec su izbacili patch:
https://support.microsoft.com/en-ae/...date-kb4343909

I Logo + Web je online, bez toga nije prava sigurnosna prijetnja:
https://foreshadowattack.eu/