{"id":48106,"date":"2022-08-22T12:09:02","date_gmt":"2022-08-22T12:09:02","guid":{"rendered":"http:\/\/a7d669ee-f439-43be-bd9d-a004ba454c83"},"modified":"2022-08-22T12:09:02","modified_gmt":"2022-08-22T12:09:02","slug":"microsoft-how-we-unearthed-a-critical-flaw-in-chromeos-and-how-google-fixed-it","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/microsoft-how-we-unearthed-a-critical-flaw-in-chromeos-and-how-google-fixed-it\/","title":{"rendered":"Microsoft: How we unearthed a critical flaw in ChromeOS, and how Google fixed it"},"content":{"rendered":"<figure class=\"c-shortcodeImage u-clearfix c-shortcodeImage-large\">\n<div class=\"c-shortcodeImage_imageContainer\">\n<div class=\"c-shortcodeImage_image\"><picture class=\"c-cmsImage\"><!----> <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.zdnet.com\/article\/microsoft-how-we-unearthed-a-critical-flaw-in-chromeos-and-how-google-fixed-it\/\" alt=\"chromeos.png\" height=\"800\" width=\"1200\"><\/picture><\/div>\n<p> <!----> <!----><\/div>\n<p> <!----><figcaption> <span class=\"c-shortcodeImage_credit g-outer-spacing-top-xsmall u-block\">Amazon<\/span><\/figcaption><\/figure>\n<p>ChromeOS is considered secure compared to legacy Windows and MacOS, but Microsoft recently discovered a nasty, remotely exploitable bug in ChromeOS&#8217;s audio server with a severity score of 9.8 out of 10.&nbsp;<\/p>\n<p><a href=\"https:\/\/www.google.com\/chromebook\/chrome-os\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">ChromeOS<\/a> is Google&#8217;s proprietary OS based on the open-source ChromiumOS, which itself is underpinned by Linux.&nbsp; &nbsp; <\/p>\n<p>Microsoft security researcher Jonathan Bar Or found the bug in the ChromiumOS Audio Server (CRAS), a service that routes audio to peripherals such as USB speakers and Bluetooth headsets.<\/p>\n<p>Or found a local memory corruption issue that could be remotely triggered by manipulating audio metadata, either in the browser or via Bluetooth.&nbsp;<\/p>\n<p>&#8220;Attackers could have lured users into meeting these conditions, such as by simply playing a new song in a browser or from a paired Bluetooth device, or leveraged adversary-in-the-middle (AiTM) capabilities to exploit the vulnerability remotely,&#8221; <a href=\"https:\/\/www.microsoft.com\/security\/blog\/2022\/08\/19\/uncovering-a-chromeos-remote-memory-corruption-vulnerability\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">he explains in a blogpost<\/a>.&nbsp;<\/p>\n<p>Microsoft reported the issue to Google in April. Google assigned the bug CVE-2022-2587 and r<a href=\"https:\/\/chromereleases.googleblog.com\/2022\/06\/stable-channel-update-for-chromeos.html\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">eleased a patch in mid-June<\/a>, but was already working fixes within a week of it being reported. Google described it as a high-severity flaw due to an out-of-bounds write in CRAS.&nbsp; &nbsp;<\/p>\n<p>Or scoped out ChromeOS in search of similar issues to the D-Bus bugs he had turned up when <a href=\"https:\/\/www.zdnet.com\/article\/microsoft-warns-these-flaws-could-give-attackers-root-privileges-on-linux-desktops\/\" rel=\"follow\">analyzing Linux earlier this year<\/a>.<\/p>\n<p>ChromeOS, being based on Linux, could also be vulnerable to similar bugs. But, he notes, ChromeOS typically requires an attacker to chain together multiple vulnerabilities due to Google&#8217;s proprietary hardening measures. Hence, there are fewer discovered flaws than in Windows or MacOS.&nbsp;<\/p>\n<p>The audio server bug was a ChromeOS-specific memory-corruption vulnerability, which Or found after inspecting the handling function called <em>SetPlayerIdentity, <\/em>which called the C library function &#8220;<a href=\"https:\/\/cplusplus.com\/reference\/cstring\/strcpy\/\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">strcpy<\/a>&#8220;.<\/p>\n<p>&#8220;To the experienced security engineer, the mention of the strcpy function immediately raises red flags,&#8221; notes Or.&nbsp;<\/p>\n<p>&#8220;The strcpy function is known to cause various memory corruption vulnerabilities since it doesn&#8217;t perform any bounds check and is therefore considered unsafe. As there are no bounds checks on the user-supplied identity argument before invoking strcpy (besides the default message length limitations for D-Bus messages), we were confident we could trigger a heap-based buffer overflow, therefore triggering a memory corruption vulnerability.&#8221;<\/p>\n<p>Heap-based buffer overflows can lead to arbitrary code execution, but to make the attack more dangerous, he needed a way to trigger it remotely, which he found could be done changing audio metadata. This can be achieved through the browser when a new song is played, or via Bluetooth when playing a new song from a paired Bluetooth device. The actual vulnerable function is cras_bt_player_update_identity.<\/p>\n<p>Or commended Google for its speed in fixing the issue after it was reported. He notes that while it not easy to exploit, its impact on a ChromeOS device \u2014 which could include old Macs and PCs <a href=\"https:\/\/www.zdnet.com\/article\/how-i-revived-three-ancient-laptops-with-chrome-os-flex\/\" rel=\"follow\">thanks to Google&#8217;s ChromeOS Flex<\/a> \u2014 warranted such a response from Google.<\/p>\n<p>&#8220;We were impressed with the speed of <a href=\"https:\/\/chromium.googlesource.com\/chromiumos\/third_party\/adhd\/+\/abba3b27864aec87044c09f8ef314e7da895fc9c\/cras\/src\/server\/cras_bt_player.c\" target=\"_blank\" rel=\"noopener noreferrer nofollow\">the fix<\/a> and the effectiveness of the overall process. Within less than a week, the code was committed and, after several merges, made generally available to users. We thank the Google team and the Chromium community for their efforts in addressing the issue,&#8221; writes Or.<\/p>\n<p>READ MORE <a href=\"https:\/\/www.zdnet.com\/article\/microsoft-how-we-unearthed-a-critical-flaw-in-chromeos-and-how-google-fixed-it\/#ftag=RSSbaffb68\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Attackers could have remotely exploited this rare ChromeOS flaw by manipulating audio metadata.<br \/>\nREAD MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[62],"tags":[],"class_list":["post-48106","post","type-post","status-publish","format-standard","hentry","category-zdnet-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Microsoft: How we unearthed a 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