{"id":"CVE-2018-6954","aliases":["DEBIAN-CVE-2018-6954","EUVD-2018-18698","GHSA-fgm4-rh7c-g9fg","SUSE-SU-2019:0137-1","SUSE-SU-2019:1265-1","UBUNTU-CVE-2018-6954","USN-3816-1","USN-3816-2","openSUSE-SU-2019:0098-1","openSUSE-SU-2024:11420-1"],"status":"published","title":"systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path...","description":"systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. 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in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on.","status":"published","published":"2018-02-13T20:00:00Z","modified":"2025-06-09T15:54:51.003Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-59"],"updated_at":"2026-11-02T14:35:05.619113Z"}],"euvd":[{"id":"EUVD-2018-18698","description":"systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on.","status":"published","published":"2018-02-13T20:00:00Z","modified":"2025-06-09T15:54:51Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T20:32:27.753525Z"}],"ghsa":[{"id":"GHSA-fgm4-rh7c-g9fg","title":"systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path...","description":"systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on.","status":"published","published":"2022-05-13T01:04:10Z","modified":"2025-06-09T18:31:56Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-59"],"updated_at":"2026-11-02T15:02:37.765114Z"}],"nvd":[{"id":"CVE-2018-6954","description":"systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on.","status":"published","published":"2018-02-13T20:29:00.547Z","modified":"2026-06-17T02:02:30.433Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":7.2,"vector":"AV:L/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-59"],"updated_at":"2026-11-02T14:04:22.897995Z"}],"osv":[{"id":"CVE-2018-6954","description":"systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on.","status":"published","published":"2018-02-13T20:29:00.547Z","modified":"2026-10-24T10:47:45.647583282Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:09.74357Z"},{"id":"DEBIAN-CVE-2018-6954","description":"systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on.","status":"published","published":"2018-02-13T20:29:00.547Z","modified":"2026-10-23T18:03:48.135179796Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:30.867575Z"},{"id":"UBUNTU-CVE-2018-6954","description":"systemd-tmpfiles in systemd through 237 mishandles symlinks present in non-terminal path components, which allows local users to obtain ownership of arbitrary files via vectors involving creation of a directory and a file under that directory, and later replacing that directory with a symlink. This occurs even if the fs.protected_symlinks sysctl is turned on.","status":"published","published":"2018-02-13T00:00:00Z","modified":"2026-04-22T12:02:56.975891Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"},{"version":"3.0","score":7.8,"vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:18.772093Z"},{"id":"openSUSE-SU-2019:0098-1","title":"Security update for systemd","description":"This update for systemd provides the following fixes:\n\nSecurity issues fixed:\n\n- CVE-2018-16864, CVE-2018-16865: Fixed two memory corruptions through attacker-controlled alloca()s (bsc#1120323)\n- CVE-2018-16866: Fixed an information leak in journald (bsc#1120323)\n- CVE-2018-6954: Fix mishandling of symlinks present in non-terminal path components (bsc#1080919)\n- Fixed an issue during system startup in relation to encrypted swap disks (bsc#1119971)\n\nNon-security issues fixed:\n\n- pam_systemd: Fix 'Cannot create session: Already running in a session' (bsc#1111498)\n- systemd-vconsole-setup: vconsole setup fails, fonts will not be copied to tty (bsc#1114933)\n- systemd-tmpfiles-setup: symlinked /tmp to /var/tmp breaking multiple units (bsc#1045723)\n- Fixed installation issue with /etc/machine-id during update (bsc#1117063)\n- btrfs: qgroups are assigned to parent qgroups after reboot (bsc#1093753)\n- logind: Stop managing VT switches if no sessions are registered on that VT. (bsc#1101591)\n- udev: Downgrade message when settting inotify watch up fails. (bsc#1005023)\n- udev: Ignore the exit code of systemd-detect-virt for memory hot-add.  In SLE-12-SP3,\n  80-hotplug-cpu-mem.rules has a memory hot-add rule that uses systemd-detect-virt to\n  detect non-zvm environment. The systemd-detect-virt returns exit failure code when it\n  detected _none_ state.  The exit failure code causes that the hot-add memory block can\n  not be set to online. (bsc#1076696)\n  \nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2019-03-23T10:50:44Z","modified":"2026-02-04T03:49:43.243676Z","updated_at":"2026-11-02T16:58:30.39372Z"},{"id":"openSUSE-SU-2024:11420-1","title":"libsystemd0-249.4-2.2 on GA media","description":"These are all security issues fixed in the libsystemd0-249.4-2.2 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T02:45:22.858405Z","updated_at":"2026-11-02T16:58:35.195147Z"},{"id":"SUSE-SU-2019:0137-1","title":"Security update for systemd","description":"This update for systemd provides the following fixes:\n\nSecurity issues fixed:\n\n- CVE-2018-16864, CVE-2018-16865: Fixed two memory corruptions through attacker-controlled alloca()s (bsc#1120323)\n- CVE-2018-16866: Fixed an information leak in journald (bsc#1120323)\n- CVE-2018-6954: Fix mishandling of symlinks present in non-terminal path components (bsc#1080919)\n- Fixed an issue during system startup in relation to encrypted swap disks (bsc#1119971)\n\nNon-security issues fixed:\n\n- pam_systemd: Fix 'Cannot create session: Already running in a session' (bsc#1111498)\n- systemd-vconsole-setup: vconsole setup fails, fonts will not be copied to tty (bsc#1114933)\n- systemd-tmpfiles-setup: symlinked /tmp to /var/tmp breaking multiple units (bsc#1045723)\n- Fixed installation issue with /etc/machine-id during update (bsc#1117063)\n- btrfs: qgroups are assigned to parent qgroups after reboot (bsc#1093753)\n- logind: Stop managing VT switches if no sessions are registered on that VT. (bsc#1101591)\n- udev: Downgrade message when settting inotify watch up fails. (bsc#1005023)\n- udev: Ignore the exit code of systemd-detect-virt for memory hot-add.  In SLE-12-SP3,\n  80-hotplug-cpu-mem.rules has a memory hot-add rule that uses systemd-detect-virt to\n  detect non-zvm environment. The systemd-detect-virt returns exit failure code when it\n  detected _none_ state.  The exit failure code causes that the hot-add memory block can\n  not be set to online. (bsc#1076696)\n  ","status":"published","published":"2019-01-21T14:52:48Z","modified":"2026-02-04T02:54:24.535369Z","updated_at":"2026-11-02T15:53:45.926331Z"},{"id":"SUSE-SU-2019:1265-1","title":"Security update for systemd","description":"This update for systemd fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2018-6954: Fixed a vulnerability in the symlink handling of systemd-tmpfiles \n  which allowed a local user to obtain ownership of arbitrary files (bsc#1080919).\n- CVE-2019-3842: Fixed a vulnerability in pam_systemd which allowed a local user to escalate privileges (bsc#1132348).\n- CVE-2019-6454: Fixed a denial of service caused by long dbus messages (bsc#1125352).\n\nNon-security issues fixed:\n\n- systemd-coredump: generate a stack trace of all core dumps (jsc#SLE-5933)\n- udevd: notify when max number value of children is reached only once per batch of events (bsc#1132400)\n- sd-bus: bump message queue size again (bsc#1132721)\n- core: only watch processes when it's really necessary (bsc#955942 bsc#1128657)\n- rules: load drivers only on 'add' events (bsc#1126056)\n- sysctl: Don't pass null directive argument to '%s' (bsc#1121563)\n- Do not automatically online memory on s390x (bsc#1127557)\n","status":"published","published":"2019-05-16T07:53:09Z","modified":"2026-02-04T02:52:27.346819Z","updated_at":"2026-11-02T15:53:45.926331Z"},{"id":"USN-3816-1","title":"systemd vulnerabilities","description":"Jann Horn discovered that unit_deserialize incorrectly handled status messages\nabove a certain length. A local attacker could potentially exploit this via\nNotifyAccess to inject arbitrary state across re-execution and obtain root\nprivileges. (CVE-2018-15686)\n\nJann Horn discovered a race condition in chown_one(). A local attacker\ncould potentially exploit this by setting arbitrary permissions on certain\nfiles to obtain root privileges. This issue only affected Ubuntu 18.04 LTS\nand Ubuntu 18.10. (CVE-2018-15687)\n\nIt was discovered that systemd-tmpfiles mishandled symlinks in\nnon-terminal path components. A local attacker could potentially exploit\nthis by gaining ownership of certain files to obtain root privileges. This\nissue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-6954)\n","status":"published","published":"2018-11-12T17:32:15Z","modified":"2026-04-22T09:52:02.389308Z","updated_at":"2026-11-02T16:58:14.019824Z"},{"id":"USN-3816-2","title":"systemd vulnerability","description":"USN-3816-1 fixed several vulnerabilities in systemd. However, the fix for\nCVE-2018-6954 was not sufficient. This update provides the remaining fixes.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n Jann Horn discovered that unit_deserialize incorrectly handled status messages\n above a certain length. A local attacker could potentially exploit this via\n NotifyAccess to inject arbitrary state across re-execution and obtain root\n privileges. (CVE-2018-15686)\n \n Jann Horn discovered a race condition in chown_one(). A local attacker\n could potentially exploit this by setting arbitrary permissions on certain\n files to obtain root privileges. This issue only affected Ubuntu 18.04 LTS\n and Ubuntu 18.10. (CVE-2018-15687)\n \n It was discovered that systemd-tmpfiles mishandled symlinks in\n non-terminal path components. A local attacker could potentially exploit\n this by gaining ownership of certain files to obtain root privileges. This\n issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-6954)\n","status":"published","published":"2018-11-19T22:03:24Z","modified":"2026-04-22T09:51:49.682879Z","updated_at":"2026-11-02T16:58:14.019824Z"}]}}