{"id":1196,"date":"2018-05-24T15:18:03","date_gmt":"2018-05-24T15:18:03","guid":{"rendered":"https:\/\/kasperskycontenthub.com\/threatpost\/?p=132246"},"modified":"2018-05-24T15:18:03","modified_gmt":"2018-05-24T15:18:03","slug":"intels-virtual-fences-spectre-fix-wont-protect-against-variant-4","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/intels-virtual-fences-spectre-fix-wont-protect-against-variant-4\/","title":{"rendered":"Intel\u2019s \u2018Virtual Fences\u2019 Spectre Fix Won\u2019t Protect Against Variant 4"},"content":{"rendered":"
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Spectre and Meltdown fixes for Intel chips announced in March, to be embedded into new CPUs, do not address the newly disclosed Variant 4, sources said.<\/p>\n

Intel introduced hardware-based safeguards<\/a> to its new chips to protect against the Spectre and Meltdown flaws that rocked the silicon industry when the vulnerabilities were made public in early 2018.\u00a0However, those protections are specific to V2 and V3, and will not impact the newly-discovered Variant 4 as well as other potential speculative execution side channel-related flaws in the future<\/a>, sources familiar with the situation told Threatpost.<\/p>\n

That said, chip experts familiar with the situation said that while these \u201cprotective walls\u201d will not impact Variant 4, Intel has added a functionality into its microcode \u2013 the\u00a0Speculative Store Bypass Disable (SSBD)\u00a0bit \u2013 to protect against Variant 4. This functionality will continue to be utilized on future hardware platforms.<\/p>\n

On Monday, Intel acknowledged that its processors are vulnerable to Variant 4, which could give attackers\u00a0unauthorized read access to memory. Similar to the Meltdown and Spectre vulnerabilities, Variant 4 (CVE-2018-3639<\/a>) is also a side channel analysis security flaw.\u00a0However, Variant 4 uses a different process to extract information and\u00a0is more of a cache exploit and that can be used in browser-based attacks.<\/p>\n

After the disclosure of Spectre and Meltdown, Intel said earlier this year it has designed a new set of CPU design features that work with the operating system to install \u201cvirtual fences\u201d protecting the system from speculative execution attacks that could exploit a variant of the Spectre flaw.<\/p>\n

\u201cWe have redesigned parts of the processor to introduce new levels of protection through partitioning that will protect against both Variants 2 and 3,\u201d Brian Krzanich, CEO of Intel, said in a blog\u00a0post<\/a> at the time. \u201cThink of this partitioning as additional \u2018protective walls\u2019 between applications and user privilege levels to create an obstacle for bad actors.\u201d<\/p>\n

Krzanich said the new safeguards will be built into Intel\u2019s next-generation Xeon Scalable processors, code-named Cascade Lake, as well as Intel\u2019s eighth-gen Core processors that are expected to ship in the second half of 2018.<\/p>\n

Patrick Moorhead, principal analyst at Moor Insights and Strategy, said that Variant 4 would be much harder to \u201cfix\u201d architecturally than V1, V2, or V3a.<\/p>\n

\u201cYou either have to turn memory disambiguation on or off, which will be a BIOS setting,\u201d he told Threatpost in an email. \u201cIt\u2019s important to note that browsers have already included mitigations and that from a severity standpoint, has been flagged as \u2018medium\u2019 severity, compared to V1, V2, and V3, which were flagged as \u2018high.’\u201d<\/p>\n

Variant 4 is most similar to Spectre V1 as opposed to Variant 2 or Variant 3, Moorhead said: \u201cGPZv1 was exploiting the nature of the processor\u2019s branch prediction. GPZv4 is taking advantage of a performance feature where the processor reorders loads\/stores (memory disambiguation) to gain performance,\u201d he said.<\/p>\n

Leslie Culbertson, executive vice president and general manager of Product Assurance and Security at\u00a0Intel, said in a\u00a0post<\/a>\u00a0on Monday,\u00a0\u00a0that unlike Intel\u2019s updates for other variants, the updates for Variant 4 will be optional and will be set to \u201coff\u201d by default.<\/p>\n

\u201cWe\u2019ve already delivered the microcode update for Variant 4 in beta form to OEM system manufacturers and system software vendors, and we expect it will be released into production BIOS and software updates over the coming weeks,\u201d she wrote.<\/p>\n

READ MORE HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

The new hardware-based protections Intel announced earlier in March it was embedding into new chips will only protect against Spectre and Meltdown \u2013 but not the newly disclosed Variant 4, sources said. READ MORE HERE…<\/p>\n","protected":false},"author":2,"featured_media":1197,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[3],"tags":[65,66,730,67,307,68,661,731,19,69],"class_list":["post-1196","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-threatpost","tag-intel","tag-intel-chip","tag-intel-mitigation","tag-meltdown","tag-security","tag-spectre","tag-variant-4","tag-variant-4-mitigation","tag-vulnerabilities","tag-web-security"],"yoast_head":"\nIntel\u2019s \u2018Virtual Fences\u2019 Spectre Fix Won\u2019t Protect Against Variant 4 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | ThreatsHub.org | Cloud Security & Cyber Threats Analysis Hub. 100% Free OSINT Threat Intelligent and Cybersecurity News.\" \/>\n<meta name=\"robots\" content=\"index, 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