{"id":"CVE-2020-28049","aliases":["ALPINE-CVE-2020-28049","DEBIAN-CVE-2020-28049","DLA-2436-1","DSA-4783-1","EUVD-2020-20539","GHSA-q868-g69p-72cw","MGASA-2020-0412","UBUNTU-CVE-2020-28049","openSUSE-SU-2020:1870-1","openSUSE-SU-2020:1899-1","openSUSE-SU-2024:11376-1"],"status":"published","title":"An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that -...","description":"An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that - for a short time period - allows local unprivileged users to create a connection to the X server without providing proper authentication. A local attacker can thus access X server display contents and, for example, intercept keystrokes or access the clipboard. This is caused by a race condition during Xauthority file creation.","severity":{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00416,"percentile":0.36222,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-362"],"published":"2020-11-04T00:00:00Z","modified":"2026-11-03T06:32:25Z","fixes":[{"ecosystem":"Alpine:v3.13","package":"sddm","fixed_in":["0.19.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"sddm","fixed_in":["0.19.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"sddm","fixed_in":["0.19.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"sddm","fixed_in":["0.19.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"sddm","fixed_in":["0.19.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"sddm","fixed_in":["0.19.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"sddm","fixed_in":["0.19.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"sddm","fixed_in":["0.19.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"sddm","fixed_in":["0.19.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"sddm","fixed_in":["0.19.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"sddm","fixed_in":["0.19.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"sddm","fixed_in":["0.19.0-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"sddm","fixed_in":["0.19.0-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"sddm","fixed_in":["0.19.0-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"sddm","fixed_in":["0.19.0-1"],"sources":["osv"]},{"ecosystem":"Debian:9","package":"sddm","fixed_in":["0.14.0-4+deb9u2"],"sources":["osv"]},{"ecosystem":"Debian:10","package":"sddm","fixed_in":["0.18.0-1+deb10u1"],"sources":["osv"]},{"ecosystem":"Mageia:7","package":"sddm","fixed_in":["0.18.1-3.1.mga7"],"sources":["osv"]},{"ecosystem":"openSUSE:Leap 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15.1","package":"sddm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.18.0-lp152.5.3.1"}]}]},{"source":"osv","ecosystem":"openSUSE:Leap 15.2","package":"sddm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.18.0-lp152.5.3.1"}]}]},{"source":"osv","ecosystem":"SUSE:Package Hub 15 SP2","package":"sddm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.18.0-bp152.5.3.1"}]}]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"sddm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.19.0-4.2"}]}],"bundled":2}],"products":[{"vendor":"debian","product":"debian_linux"},{"vendor":"fedoraproject","product":"fedora"},{"vendor":"opensuse","product":"leap"},{"vendor":"sddm_project","product":"sddm"}],"references":[{"url":"https://github.com/sddm/sddm/releases","tags":["x_transferred","Release Notes","Third Party Advisory","advisory","report"]},{"url":"https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049","tags":["x_transferred","Exploit","Issue Tracking","Third Party Advisory","report"]},{"url":"https://github.com/sddm/sddm/blob/v0.19.0/ChangeLog","tags":["x_transferred","Release Notes","Third Party Advisory","advisory","report"]},{"url":"https://www.debian.org/security/2020/dsa-4783","tags":["vendor-advisory","x_transferred","Third Party Advisory","advisory","web"]},{"url":"https://lists.debian.org/debian-lts-announce/2020/11/msg00009.html","tags":["mailing-list","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00031.html","tags":["vendor-advisory","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GT3EX5NSQJJAKY63ENSMEDX6NYZLYY3S/","tags":["vendor-advisory","x_transferred","web"]},{"url":"https://security.gentoo.org/glsa/202402-02","tags":["vendor-advisory","x_transferred","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-28049"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GT3EX5NSQJJAKY63ENSMEDX6NYZLYY3S"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GT3EX5NSQJJAKY63ENSMEDX6NYZLYY3S"},{"url":"https://github.com/advisories/GHSA-q868-g69p-72cw"},{"url":"https://security.alpinelinux.org/vuln/CVE-2020-28049","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-28049","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2020-0412.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=27565","tags":["report"]},{"url":"https://www.openwall.com/lists/oss-security/2020/11/04/2","tags":["web","report"]},{"url":"https://ubuntu.com/security/CVE-2020-28049","tags":["report"]},{"url":"https://github.com/sddm/sddm/commit/be202f533ab98a684c6a007e8d5b4357846bc222","tags":["report"]},{"url":"https://bugzilla.suse.com/show_bug.cgi?id=1177201","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-28049","tags":["report"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/WGAE67D3QSRXWKLUPWPTK52VN43WVGUP/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1177201","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28049","tags":["web"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/TO7JRTPGBU4JZ3MOLPKGZUUXQGICWL4Z/","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2018-14345","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2020-28049","description":"An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that - for a short time period - allows local unprivileged users to create a connection to the X server without providing proper authentication. A local attacker can thus access X server display contents and, for example, intercept keystrokes or access the clipboard. This is caused by a race condition during Xauthority file creation.","status":"published","published":"2020-11-04T00:00:00Z","modified":"2024-10-15T18:10:25.839Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-362"],"updated_at":"2026-11-02T14:35:57.017407Z"}],"euvd":[{"id":"EUVD-2020-20539","description":"An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that - for a short time period - allows local unprivileged users to create a connection to the X server without providing proper authentication. A local attacker can thus access X server display contents and, for example, intercept keystrokes or access the clipboard. This is caused by a race condition during Xauthority file creation.","status":"published","published":"2020-11-04T00:00:00Z","modified":"2024-10-15T18:10:25Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"medium"}],"updated_at":"2026-11-03T00:27:36.689661Z"}],"ghsa":[{"id":"GHSA-q868-g69p-72cw","title":"An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that -...","description":"An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that - for a short time period - allows local unprivileged users to create a connection to the X server without providing proper authentication. A local attacker can thus access X server display contents and, for example, intercept keystrokes or access the clipboard. This is caused by a race condition during Xauthority file creation.","status":"published","published":"2022-05-24T17:33:09Z","modified":"2024-10-15T21:31:34Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"medium"}],"cwes":["CWE-362"],"updated_at":"2026-11-02T14:58:30.303503Z"}],"nvd":[{"id":"CVE-2020-28049","description":"An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that - for a short time period - allows local unprivileged users to create a connection to the X server without providing proper authentication. A local attacker can thus access X server display contents and, for example, intercept keystrokes or access the clipboard. This is caused by a race condition during Xauthority file creation.","status":"published","published":"2020-11-04T19:15:12.137Z","modified":"2026-06-17T03:10:04.163Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"medium","assessor":"primary"},{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"medium","assessor":"secondary"},{"version":"2.0","score":3.3,"vector":"AV:L/AC:M/Au:N/C:P/I:P/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-362"],"updated_at":"2026-11-02T14:06:21.80969Z"}],"osv":[{"id":"ALPINE-CVE-2020-28049","description":"An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that - for a short time period - allows local unprivileged users to create a connection to the X server without providing proper authentication. A local attacker can thus access X server display contents and, for example, intercept keystrokes or access the clipboard. This is caused by a race condition during Xauthority file creation.","status":"published","published":"2020-11-04T19:15:12.137Z","modified":"2026-11-03T06:32:25.534798708Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"medium"}],"updated_at":"2026-11-03T07:17:57.723967Z"},{"id":"CVE-2020-28049","description":"An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that - for a short time period - allows local unprivileged users to create a connection to the X server without providing proper authentication. A local attacker can thus access X server display contents and, for example, intercept keystrokes or access the clipboard. This is caused by a race condition during Xauthority file creation.","status":"published","published":"2020-11-04T19:15:12.137Z","modified":"2026-10-20T10:54:19.283533282Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:16.248747Z"},{"id":"DEBIAN-CVE-2020-28049","description":"An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that - for a short time period - allows local unprivileged users to create a connection to the X server without providing proper authentication. A local attacker can thus access X server display contents and, for example, intercept keystrokes or access the clipboard. This is caused by a race condition during Xauthority file creation.","status":"published","published":"2020-11-04T19:15:12.137Z","modified":"2026-10-26T12:00:38.882235397Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:33.729655Z"},{"id":"UBUNTU-CVE-2020-28049","description":"An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that - for a short time period - allows local unprivileged users to create a connection to the X server without providing proper authentication. A local attacker can thus access X server display contents and, for example, intercept keystrokes or access the clipboard. This is caused by a race condition during Xauthority file creation.","status":"published","published":"2020-11-04T19:15:00Z","modified":"2025-10-24T04:48:53Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"medium"},{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:24.541803Z"},{"id":"DLA-2436-1","title":"sddm - security update","status":"published","published":"2020-11-06T00:00:00Z","modified":"2026-03-09T01:21:08.71695Z","updated_at":"2026-11-02T15:46:10.712745Z"},{"id":"DSA-4783-1","title":"sddm - security update","status":"published","published":"2020-11-05T00:00:00Z","modified":"2026-03-09T02:09:13.080188Z","updated_at":"2026-11-02T15:46:17.19998Z"},{"id":"MGASA-2020-0412","title":"Updated sddm package fixes a security vulnerability","description":"Fabian Vogt discovered a flaw in sddm before 0.19.0. A local attacker can take\nadvantage of a race condition when creating the Xauthority file to escalate\nprivileges (CVE-2020-28049).\n","status":"published","published":"2020-11-10T15:20:00Z","modified":"2026-04-16T04:41:47.341796656Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"id":"openSUSE-SU-2020:1870-1","title":"Security update for sddm","description":"This update for sddm fixes the following issue:\n\n- Fix X not having access control on startup (boo#1177201, CVE-2020-28049).\n","status":"published","published":"2020-11-07T11:24:31Z","modified":"2026-02-04T03:33:13.305462Z","updated_at":"2026-11-02T16:58:31.517538Z"},{"id":"openSUSE-SU-2020:1899-1","title":"Security update for sddm","description":"This update for sddm fixes the following issue:\n\n- Fix X not having access control on startup (boo#1177201, CVE-2020-28049).\n\nThis update was imported from the openSUSE:Leap:15.2:Update update project.","status":"published","published":"2020-11-11T09:30:41Z","modified":"2026-02-04T03:03:10.25644Z","updated_at":"2026-11-02T16:58:31.517538Z"},{"id":"openSUSE-SU-2024:11376-1","title":"sddm-0.19.0-4.2 on GA media","description":"These are all security issues fixed in the sddm-0.19.0-4.2 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T04:34:33.428547Z","updated_at":"2026-11-02T16:58:35.195147Z"}]}}