{"id":"CVE-2017-2624","details":"It was found that xorg-x11-server before 1.19.0 including uses memcmp() to check the received MIT cookie against a series of valid cookies. If the cookie is correct, it is allowed to attach to the Xorg session. Since most memcmp() implementations return after an invalid byte is seen, this causes a time difference between a valid and invalid byte, which could allow an efficient brute force attack.","modified":"2026-04-16T06:17:55.862958210Z","published":"2018-07-27T18:29:00.827Z","related":["SUSE-SU-2017:1675-1","openSUSE-SU-2024:11525-1"],"references":[{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/201704-03"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/201710-30"},{"type":"ADVISORY","url":"http://www.securityfocus.com/bid/96480"},{"type":"ADVISORY","url":"http://www.securitytracker.com/id/1037919"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2624"},{"type":"FIX","url":"https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627c"},{"type":"EVIDENCE","url":"https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://gitlab.freedesktop.org/xorg/xserver","events":[{"introduced":"0"},{"last_affected":"ec37e559614cf4eaba67d3ca0693f09fd95a5d57"},{"introduced":"0"},{"last_affected":"0d7ec5c7d9b451066a079fe56bcc9722341a91ff"},{"fixed":"d7ac755f0b618eb1259d93c8a16ec6e39a18627c"}],"database_specific":{"versions":[{"introduced":"0"},{"last_affected":"1.19.4"},{"introduced":"0"},{"last_affected":"7.0"}]}}],"versions":["DRI-XFree86-4_3_99_12-merge","DRI-trunk-20040613","DRI-trunk-20040721","DRM-1_0_5","DRM-20040613","DRM-20040721","DRM-20050615","DRM-20051017","DRM-2_0_0","Domain-base","Domain-sync1","Domain-sync2","Domain-sync3","Domain-sync4","MODULAR_COPY","PRE_xf86-4_3_0_1","XACE-SELINUX-MERGE","XORG-6_7_99_1","XORG-6_7_99_2","XORG-6_7_99_901","XORG-6_7_99_902","XORG-6_7_99_903","XORG-6_7_99_904","XORG-6_8_0","XORG-6_8_99_1","XORG-6_8_99_10","XORG-6_8_99_11","XORG-6_8_99_12","XORG-6_8_99_13","XORG-6_8_99_14","XORG-6_8_99_15","XORG-6_8_99_16","XORG-6_8_99_2","XORG-6_8_99_3","XORG-6_8_99_4","XORG-6_8_99_5","XORG-6_8_99_6","XORG-6_8_99_7","XORG-6_8_99_8","XORG-6_8_99_9","XORG-6_8_99_900","XORG-6_8_99_901","XORG-6_8_99_902","XORG-6_8_99_903","XORG-6_99_99_900","XORG-6_99_99_901","XORG-6_99_99_902","XORG-6_99_99_903","XORG-6_99_99_904","XORG-7_0","XORG-7_0_99_901","XORG-MAIN","add-Xi","ah-20021030","ah-20021030-postdri","before-mesa-4_0-import","dhd-20010328","dhd-20010817","dhd-20020916","dri-0-1-branchpoint","dri-20020129-merge","dri-20020222-merge","kdrive-initial-import","keithp","lg3d-base","pre-R651-import","pre-xgldrop-merge","sco_port_update-base","xf-3_9_16Z","xf-3_9_16Za","xf-3_9_16d","xf-3_9_16e","xf-3_9_16f","xf-3_9_17","xf-3_9_17Z","xf-3_9_17a","xf-3_9_17b","xf-3_9_17c","xf-3_9_17d","xf-3_9_17e","xf-3_9_17f","xf-3_9_18","xf-3_9_18Z","xf-3_9_18Za","xf-3_9_18a","xf-3_9_18b","xf-4_0","xf-4_0-bindist","xf-4_0Z","xf-4_0_1","xf-4_0_1-bindist","xf-4_0_1Z","xf-4_0_1Za","xf-4_0_1Zb","xf-4_0_1Zc","xf-4_0_1a","xf-4_0_1b","xf-4_0_1c","xf-4_0_1d","xf-4_0_1e","xf-4_0_1f","xf-4_0_1g","xf-4_0_1h","xf-4_0_2","xf-4_0_2-bindist","xf-4_0_99_1","xf-4_0_99_2","xf-4_0_99_3","xf-4_0_99_900","xf-4_0a","xf-4_0b","xf-4_0c","xf-4_0d","xf-4_0e","xf-4_0f","xf-4_0g","xf-4_1_99_1","xf-4_1_99_2","xf-4_1_99_3","xf-4_1_99_4","xf-4_1_99_5","xf-4_1_99_6","xf-4_1_99_7","xf-4_2-bp","xf-4_2_0","xf-4_2_0-bindist","xf-4_2_0-bindist-1","xf-4_2_0_1","xf-4_2_1","xf-4_2_1_1","xf-4_2_99_1","xf-4_2_99_2","xf-4_2_99_3","xf-4_2_99_4","xf-4_2_99_901","xf-4_2_99_902","xf-4_3_0","xf-4_3_0_1","xf-4_3_99_1","xf-4_3_99_2","xf-4_3_99_3","xf-4_3_99_4","xf-4_3_99_5","xf-4_3_99_6","xf86-012804-2330","xf86-4_3_0_1","xf86-4_3_99_16","xf86-4_3_99_901","xf86-4_3_99_902","xf86-4_3_99_903","xf86-4_3_99_903_special","xf86-4_4_0","xf86-4_4_99_1","xfixes_2_branchpoint","xorg-server-0_99_1","xorg-server-1.1.99.3","xorg-server-1.10.0","xorg-server-1.10.99.901","xorg-server-1.10.99.902","xorg-server-1.11.0","xorg-server-1.11.99.1","xorg-server-1.11.99.901","xorg-server-1.11.99.902","xorg-server-1.11.99.903","xorg-server-1.12.0","xorg-server-1.12.99.901","xorg-server-1.12.99.902","xorg-server-1.12.99.903","xorg-server-1.12.99.904","xorg-server-1.12.99.905","xorg-server-1.13.0","xorg-server-1.13.99.901","xorg-server-1.13.99.902","xorg-server-1.14.0","xorg-server-1.14.99.1","xorg-server-1.14.99.2","xorg-server-1.14.99.3","xorg-server-1.14.99.901","xorg-server-1.14.99.902","xorg-server-1.14.99.903","xorg-server-1.14.99.904","xorg-server-1.14.99.905","xorg-server-1.15.0","xorg-server-1.15.99.901","xorg-server-1.15.99.902","xorg-server-1.15.99.903","xorg-server-1.15.99.904","xorg-server-1.16.0","xorg-server-1.16.99.901","xorg-server-1.16.99.902","xorg-server-1.17.0","xorg-server-1.17.99.901","xorg-server-1.17.99.902","xorg-server-1.18.0","xorg-server-1.18.99.2","xorg-server-1.18.99.901","xorg-server-1.18.99.902","xorg-server-1.19.0","xorg-server-1.19.1","xorg-server-1.19.2","xorg-server-1.19.3","xorg-server-1.19.4","xorg-server-1.5.99.1","xorg-server-1.6.99.900","xorg-server-1.6.99.901","xorg-server-1.7.99.1","xorg-server-1.7.99.2","xorg-server-1.7.99.901","xorg-server-1.7.99.902","xorg-server-1.8.0","xorg-server-1.8.99.901","xorg-s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