Otu ndị nyocha sitere na Mahadum Teknụzụ Graz (Austria), nke amaburu maka mmepe MDS, NetSpectre, Throwhammer na ZombieLoad ọgụ, ekpughere nkọwa nke mwakpo ọwa ọhụrụ (CVE-2021-46778) na kwụ n'ahịrị onye nrụpụta AMD processor. , nke a na-eji na-ahazi oge mmezu nke ntuziaka na nkeji mmezu dị iche iche nke CPU. Mwakpo a, nke a na-akpọ SQUIP, na-enye gị ohere ikpebi data eji na mgbako na usoro ọzọ ma ọ bụ igwe mebere ma ọ bụ hazie ọwa nkwukọrịta zoro ezo n'etiti usoro ma ọ bụ igwe mebere nke na-enye gị ohere ịgbanwe data gafere usoro njikwa ohere sistemụ.
AMD CPUs dabere na 2000st, 5000nd, na 3000rd ọgbọ Zen microarchitectures (AMD Ryzen XNUMX-XNUMX, AMD Ryzen Threadripper, AMD Athlon XNUMX, AMD EPYC) na-emetụta mgbe ị na-eji Simultaneous Multithreading Technology (SMT). Ndị na-arụ ọrụ Intel adịghị enwe ike ịwakpo, ebe ha na-eji otu ahịrị nhazi oge, ebe ndị na-emepụta AMD na-adịghị ike na-eji ahịrị dị iche iche maka mpaghara igbu ọ bụla. Dị ka ihe na-arụ ọrụ iji gbochie ntapu ozi, AMD tụrụ aro ka ndị mmepe jiri algọridim na-eme mgbakọ mgbakọ na mwepụ mgbe niile n'oge ọ bụla, n'agbanyeghị ọdịdị nke data a na-ahazi, ma na-ezere alaka ụlọ ọrụ dabere na data nzuzo.
Mwakpo a dabere na nyocha nke ọkwa nke esemokwu (ọkwa esemokwu) na usoro nhazi dị iche iche ma na-eme ya site na nha nke igbu oge mgbe ịmalite ọrụ nlele emere na eriri SMT ọzọ na otu CPU anụ ahụ. Iji nyochaa ọdịnaya ahụ, a na-eji usoro Prime + Probe, nke na-egosi na ejiri ụkpụrụ ntụnye mejupụta kwụ n'ahịrị na ikpebi mgbanwe site na ịlele oge ịnweta ha mgbe ị na-ejuputa.
N'oge nnwale ahụ, ndị nyocha ahụ nwere ike megharịa igodo 4096-bit RSA nkeonwe nke ejiri mepụta mbinye aka dijitalụ site na iji mbedTLS 3.0 cryptographic ọba akwụkwọ, nke na-eji Montgomery algọridim na-ebuli ọnụọgụ gaa na modulo ike. Ọ were akara 50500 iji chọpụta igodo. Ngụkọta oge ọgụ were nkeji iri atọ na asatọ. E gosipụtara ụdị ọgụ dị iche iche nke na-enye ọgbaghara n'etiti usoro dị iche iche na igwe mebere nke KVM hypervisor na-achịkwa. E gosikwara na enwere ike iji usoro ahụ hazie nnyefe data zoro ezo n'etiti igwe mebere na ọnụego 38 Mbit / s yana n'etiti usoro na ọnụego 0.89 Mbit / s na ọnụego njehie na-erughị 2.70%.
isi: opennet.ru