{"id":52776,"date":"2023-07-14T14:17:07","date_gmt":"2023-07-14T14:17:07","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/34798\/How-A-Cloud-Flaw-Gave-Chinese-Spies-A-Key-To-Microsoft.html"},"modified":"2023-07-14T14:17:07","modified_gmt":"2023-07-14T14:17:07","slug":"how-a-cloud-flaw-gave-chinese-spies-a-key-to-microsoft","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/how-a-cloud-flaw-gave-chinese-spies-a-key-to-microsoft\/","title":{"rendered":"How A Cloud Flaw Gave Chinese Spies A Key To Microsoft"},"content":{"rendered":"<figure class=\"intro-image intro-left\"> <img decoding=\"async\" src=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2021\/02\/microsoft-800x533.jpg\" alt=\"Shadowy figures stand beneath a Microsoft logo on a faux wood wall.\"><figcaption class=\"caption\"><\/figcaption><\/figure>\n<aside id=\"social-left\" class=\"social-left\" aria-label=\"Read the comments or share this article\"> <a class=\"comment-count icon-comment-bubble-down\" href=\"https:\/\/arstechnica.com\/security\/2023\/07\/how-a-cloud-flaw-gave-chinese-spies-a-key-to-microsofts-kingdom\/?comments=1\"> <\/p>\n<h4 class=\"comment-count-before\">reader comments<\/h4>\n<p> <span class=\"comment-count-number\">45<\/span> <span class=\"visually-hidden\"> with <\/span> <\/a> <\/aside>\n<p> <!-- cache hit 49:single\/related:acc378c26ae9708778622d0c7d8a61a1 --><!-- empty --><\/p>\n<p>For most IT professionals, the move to the cloud has been a godsend. Instead of protecting your data yourself, let the security experts at Google or Microsoft protect it instead. But when a single stolen key can let hackers access cloud data from dozens of organizations, that trade-off starts to sound far more risky.<\/p>\n<p>Late Tuesday evening, Microsoft <a href=\"https:\/\/blogs.microsoft.com\/on-the-issues\/2023\/07\/11\/mitigation-china-based-threat-actor\/\" target=\"_blank\" rel=\"nofollow noopener\" data-offer-url=\"https:\/\/blogs.microsoft.com\/on-the-issues\/2023\/07\/11\/mitigation-china-based-threat-actor\/\" data-event-click=\"{&quot;element&quot;:&quot;ExternalLink&quot;,&quot;outgoingURL&quot;:&quot;https:\/\/blogs.microsoft.com\/on-the-issues\/2023\/07\/11\/mitigation-china-based-threat-actor\/&quot;}\" data-uri=\"14aefb6a8294c68b67dbc6237ef71dc0\">revealed<\/a> that a China-based hacker group, dubbed Storm-0558, had done exactly that. The group, which is focused on espionage against Western European governments, had accessed the cloud-based Outlook email systems of 25 organizations, including multiple government agencies. <\/p>\n<figure class=\"image shortcode-img right full\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cdn.arstechnica.net\/wp-content\/uploads\/2019\/02\/wired-logo.png\" width=\"218\" height=\"58\"><\/figure>\n<p>Those targets encompass US government agencies including the State Department, <a href=\"https:\/\/www.cnn.com\/2023\/07\/12\/politics\/china-based-hackers-us-government-email-intl-hnk\/index.html\" data-uri=\"728d1f3647059ee4c9d9b36fab8871fa\">according to CNN<\/a>, though US officials are still working to determine the full scope and fallout of the breaches. An <a href=\"https:\/\/www.cisa.gov\/news-events\/cybersecurity-advisories\/aa23-193a\" target=\"_blank\" rel=\"nofollow noopener\" data-offer-url=\"https:\/\/www.cisa.gov\/news-events\/cybersecurity-advisories\/aa23-193a\" data-event-click=\"{&quot;element&quot;:&quot;ExternalLink&quot;,&quot;outgoingURL&quot;:&quot;https:\/\/www.cisa.gov\/news-events\/cybersecurity-advisories\/aa23-193a&quot;}\" data-uri=\"d49392be348ca22bc39f5753cea207f3\">advisory from the US Cybersecurity and Infrastructure Security Agency<\/a> says the breach, which was detected in mid-June by a US government agency, stole unclassified email data \u201cfrom a small number of accounts.\u201d<\/p>\n<p>China has been relentlessly hacking Western networks for decades. But this latest attack uses a unique trick: Microsoft says hackers stole a cryptographic key that let them generate their own authentication \u201ctokens\u201d\u2014strings of information meant to prove a user\u2019s identity\u2014giving them free rein across dozens of Microsoft customer accounts.<\/p>\n<p>\u201cWe put trust in passports, and someone stole a passport-printing machine,\u201d says Jake Williams, a former NSA hacker who now teaches at the Institute for Applied Network Security in Boston. \u201cFor a shop as large as Microsoft, with that many customers impacted\u2014or who could have been impacted by this\u2014it\u2019s unprecedented.\u201d<\/p>\n<aside class=\"ad_wrapper\" aria-label=\"In Content advertisement\"> <span class=\"ad_notice\">Advertisement <\/span> <\/aside>\n<p>In web-based cloud systems, users\u2019 browsers connect to a remote server and, when they enter credentials like a username and password, they\u2019re given a bit of data, known as a token, from that server. The token serves as a kind of temporary identity card that lets users come and go as they please within a cloud environment while only occasionally reentering their credentials. To ensure that the token can\u2019t be spoofed, it\u2019s cryptographically signed with a unique string of data known as a certificate or key that the cloud service possesses, a kind of unforgeable stamp of authenticity.<\/p>\n<p>Microsoft, in its <a href=\"https:\/\/msrc.microsoft.com\/blog\/2023\/07\/microsoft-mitigates-china-based-threat-actor-storm-0558-targeting-of-customer-email\/\" target=\"_blank\" rel=\"nofollow noopener\" data-offer-url=\"https:\/\/msrc.microsoft.com\/blog\/2023\/07\/microsoft-mitigates-china-based-threat-actor-storm-0558-targeting-of-customer-email\/\" data-event-click=\"{&quot;element&quot;:&quot;ExternalLink&quot;,&quot;outgoingURL&quot;:&quot;https:\/\/msrc.microsoft.com\/blog\/2023\/07\/microsoft-mitigates-china-based-threat-actor-storm-0558-targeting-of-customer-email\/&quot;}\" data-uri=\"ac2f60db69c2a9bb78c048eaa11858be\">blog post<\/a> revealing the Chinese Outlook breaches, has described a kind of two-stage breakdown of that authentication system. First, hackers were somehow able to steal a key that Microsoft uses to sign tokens for consumer-grade users of its cloud services. Second, the hackers exploited a bug in Microsoft\u2019s token validation system, which allowed them to sign consumer-grade tokens with the stolen key and then use them to instead access enterprise-grade systems. All of this occurred despite Microsoft\u2019s attempt to check for signatures from different keys for those different grades of token.<\/p>\n<p>Microsoft says it has now blocked all tokens that were signed with the stolen key and replaced the key with a new one, preventing the hackers from accessing victims\u2019 systems. The company adds that it has also worked to improve the security of its \u201ckey management systems\u201d since the theft occurred.<\/p>\n<p>But exactly how such a sensitive key, allowing such broad access, could be stolen in the first place remains unknown. WIRED contacted Microsoft, but the company declined to comment further.<\/p>\n<p>In the absence of more details from Microsoft, one theory of how the theft occurred is that the token-signing key wasn\u2019t in fact stolen from Microsoft at all, according to Tal Skverer, who leads research at the security Astrix, which earlier this year uncovered a token security issue in Google\u2019s cloud. In older setups of Outlook, the service is hosted and managed on a server owned by the customer rather than in Microsoft\u2019s cloud. That might have allowed the hackers to steal the key from one of these \u201con-premises\u201d setups on a customer\u2019s network.<\/p>\n<p> READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/34798\/How-A-Cloud-Flaw-Gave-Chinese-Spies-A-Key-To-Microsoft.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":52777,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[277],"tags":[10593],"class_list":["post-52776","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cybersecurity-blogs","tag-headlinehackermicrosoftchinaflawcyberwar"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How A Cloud Flaw Gave Chinese Spies A Key To 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