{"id":34062,"date":"2018-09-14T09:45:34","date_gmt":"2018-09-14T02:45:34","guid":{"rendered":"http:\/\/deepquest.code511.com\/blog\/2018\/09\/chrome-os-grpc-garcon-command-execution\/"},"modified":"2018-09-14T09:45:34","modified_gmt":"2018-09-14T02:45:34","slug":"chrome-os-grpc-garcon-command-execution","status":"publish","type":"post","link":"https:\/\/deepquest.code511.com\/blog\/2018\/09\/chrome-os-grpc-garcon-command-execution\/","title":{"rendered":"Chrome OS gRPC garcon Command Execution"},"content":{"rendered":"<p>There is a variety of RPC communication channels between the Chrome OS host system and the crosvm guest. This bug report focuses on communication on TCP port 8889, which is used by the &#8220;garcon&#8221; service. garcon uses gRPC, which is an RPC protocol that sends protobufs over plaintext HTTP\/2. (Other system components communicate with the VM over gRPC-over-vsock, but garcon uses gRPC-over-TCP.) For some command types, the TCP connection is initiated by the host; for others, it is initiated by the guest. Both guest and host are listening on [::]:8889; however, the iptables rules of the host prevent an outside host from simply connecting to those sockets. However, apps running on the host are not affected by such restrictions.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>There is a variety of RPC communication channels between the Chrome OS host system and the crosvm guest. This bug report focuses on communication on TCP port 8889, which is&#8230;<\/p>\n","protected":false},"author":439,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[43],"tags":[],"class_list":["post-34062","post","type-post","status-publish","format-standard","hentry","category-exploit"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p4bBYZ-8Ro","_links":{"self":[{"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/posts\/34062","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/users\/439"}],"replies":[{"embeddable":true,"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/comments?post=34062"}],"version-history":[{"count":0,"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/posts\/34062\/revisions"}],"wp:attachment":[{"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/media?parent=34062"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/categories?post=34062"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/tags?post=34062"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}