{"id":"USN-6555-2","summary":"xorg-server vulnerabilities","details":"USN-6555-1 fixed several vulnerabilities in X.Org. This update provides\nthe corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.\n\nOriginal advisory details:\n\n Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled XKB\n button actions. An attacker could possibly use this issue to cause the X\n Server to crash, execute arbitrary code, or escalate privileges.\n (CVE-2023-6377)\n\n Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled\n memory when processing the RRChangeOutputProperty and\n RRChangeProviderProperty APIs. An attacker could possibly use this issue to\n cause the X Server to crash, or obtain sensitive information.\n (CVE-2023-6478)\n","modified":"2026-04-27T17:00:46.748878Z","published":"2023-12-13T17:41:03Z","related":["UBUNTU-CVE-2023-6377","UBUNTU-CVE-2023-6478"],"upstream":["CVE-2023-6377","CVE-2023-6478","UBUNTU-CVE-2023-6377","UBUNTU-CVE-2023-6478"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6555-2"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-6377"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-6478"}],"affected":[{"package":{"name":"xorg-server","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/xorg-server@2:1.18.4-0ubuntu0.12+esm8?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:1.18.4-0ubuntu0.12+esm8"}]}],"versions":["2:1.17.2-1ubuntu9","2:1.17.2-1ubuntu10","2:1.17.3-2ubuntu1","2:1.17.3-2ubuntu2","2:1.17.3-2ubuntu3","2:1.17.3-2ubuntu4","2:1.18.1-1ubuntu3","2:1.18.1-1ubuntu4","2:1.18.3-1ubuntu1","2:1.18.3-1ubuntu2","2:1.18.3-1ubuntu2.2","2:1.18.3-1ubuntu2.3","2:1.18.4-0ubuntu0.1","2:1.18.4-0ubuntu0.2","2:1.18.4-0ubuntu0.3","2:1.18.4-0ubuntu0.4","2:1.18.4-0ubuntu0.6","2:1.18.4-0ubuntu0.7","2:1.18.4-0ubuntu0.8","2:1.18.4-0ubuntu0.9","2:1.18.4-0ubuntu0.10","2:1.18.4-0ubuntu0.11","2:1.18.4-0ubuntu0.12","2:1.18.4-0ubuntu0.12+esm1","2:1.18.4-0ubuntu0.12+esm2","2:1.18.4-0ubuntu0.12+esm4","2:1.18.4-0ubuntu0.12+esm5","2:1.18.4-0ubuntu0.12+esm6"],"ecosystem_specific":{"binaries":[{"binary_version":"2:1.18.4-0ubuntu0.12+esm8","binary_name":"xdmx"},{"binary_version":"2:1.18.4-0ubuntu0.12+esm8","binary_name":"xdmx-tools"},{"binary_version":"2:1.18.4-0ubuntu0.12+esm8","binary_name":"xmir"},{"binary_version":"2:1.18.4-0ubuntu0.12+esm8","binary_name":"xnest"},{"binary_version":"2:1.18.4-0ubuntu0.12+esm8","binary_name":"xorg-server-source"},{"binary_version":"2:1.18.4-0ubuntu0.12+esm8","binary_name":"xserver-common"},{"binary_version":"2:1.18.4-0ubuntu0.12+esm8","binary_name":"xserver-xephyr"},{"binary_version":"2:1.18.4-0ubuntu0.12+esm8","binary_name":"xserver-xorg-core"},{"binary_version":"2:1.18.4-0ubuntu0.12+esm8","binary_name":"xserver-xorg-legacy"},{"binary_version":"2:1.18.4-0ubuntu0.12+esm8","binary_name":"xserver-xorg-xmir"},{"binary_version":"2:1.18.4-0ubuntu0.12+esm8","binary_name":"xvfb"},{"binary_version":"2:1.18.4-0ubuntu0.12+esm8","binary_name":"xwayland"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6555-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"id":"CVE-2023-6377","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2023-6478","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}]}}},{"package":{"name":"xorg-server","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/xorg-server@2:1.19.6-1ubuntu4.15+esm3?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:1.19.6-1ubuntu4.15+esm3"}]}],"versions":["2:1.19.5-0ubuntu2","2:1.19.6-1ubuntu1","2:1.19.6-1ubuntu2","2:1.19.6-1ubuntu3","2:1.19.6-1ubuntu4","2:1.19.6-1ubuntu4.1","2:1.19.6-1ubuntu4.2","2:1.19.6-1ubuntu4.3","2:1.19.6-1ubuntu4.4","2:1.19.6-1ubuntu4.5","2:1.19.6-1ubuntu4.6","2:1.19.6-1ubuntu4.7","2:1.19.6-1ubuntu4.8","2:1.19.6-1ubuntu4.9","2:1.19.6-1ubuntu4.10","2:1.19.6-1ubuntu4.11","2:1.19.6-1ubuntu4.12","2:1.19.6-1ubuntu4.13","2:1.19.6-1ubuntu4.14","2:1.19.6-1ubuntu4.15","2:1.19.6-1ubuntu4.15+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"2:1.19.6-1ubuntu4.15+esm3","binary_name":"xdmx"},{"binary_version":"2:1.19.6-1ubuntu4.15+esm3","binary_name":"xdmx-tools"},{"binary_version":"2:1.19.6-1ubuntu4.15+esm3","binary_name":"xmir"},{"binary_version":"2:1.19.6-1ubuntu4.15+esm3","binary_name":"xnest"},{"binary_version":"2:1.19.6-1ubuntu4.15+esm3","binary_name":"xorg-server-source"},{"binary_version":"2:1.19.6-1ubuntu4.15+esm3","binary_name":"xserver-common"},{"binary_version":"2:1.19.6-1ubuntu4.15+esm3","binary_name":"xserver-xephyr"},{"binary_version":"2:1.19.6-1ubuntu4.15+esm3","binary_name":"xserver-xorg-core"},{"binary_version":"2:1.19.6-1ubuntu4.15+esm3","binary_name":"xserver-xorg-legacy"},{"binary_version":"2:1.19.6-1ubuntu4.15+esm3","binary_name":"xserver-xorg-xmir"},{"binary_version":"2:1.19.6-1ubuntu4.15+esm3","binary_name":"xvfb"},{"binary_version":"2:1.19.6-1ubuntu4.15+esm3","binary_name":"xwayland"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6555-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"id":"CVE-2023-6377","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2023-6478","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}]}}}],"schema_version":"1.7.5"}