{"id":"CVE-2023-4001","aliases":["ALSA-2024:0468","BELL-CVE-2023-4001","CLSA-2024-1712672279","EUVD-2023-53896","GHSA-rr4v-xrwq-7rhx","MGASA-2024-0095","RHSA-2024:0437","RHSA-2024:0456","RHSA-2024:0468","UBUNTU-CVE-2023-4001"],"status":"published","title":"Grub2: bypass the grub password protection feature","description":"An authentication bypass flaw was found in GRUB due to the way that GRUB uses the UUID of a device to search for the configuration file that contains the password hash for the GRUB password protection feature. An attacker capable of attaching an external drive such as a USB stick containing a file system with a duplicate UUID (the same as in the \"/boot/\" file system) can bypass the GRUB password protection feature on UEFI systems, which enumerate removable drives before non-removable ones. This issue was introduced in a downstream patch in Red Hat's version of grub2 and does not affect the upstream package.","severity":{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00542,"percentile":0.45887,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-290"],"published":"2024-01-11T05:58:31.930848Z","modified":"2026-10-29T11:31:40Z","fixes":[{"ecosystem":"AlmaLinux:9","package":"grub2-common","fixed_in":["1:2.06-70.el9_3.2.alma.1"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"grub2-efi-aa64","fixed_in":["1:2.06-70.el9_3.2.alma.1"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"grub2-efi-aa64-cdboot","fixed_in":["1:2.06-70.el9_3.2.alma.1"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"grub2-efi-aa64-modules","fixed_in":["1:2.06-70.el9_3.2.alma.1"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"grub2-efi-x64","fixed_in":["1:2.06-70.el9_3.2.alma.1"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"grub2-efi-x64-cdboot","fixed_in":["1:2.06-70.el9_3.2.alma.1"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"grub2-efi-x64-modules","fixed_in":["1:2.06-70.el9_3.2.alma.1"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"grub2-pc","fixed_in":["1:2.06-70.el9_3.2.alma.1"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"grub2-pc-modules","fixed_in":["1:2.06-70.el9_3.2.alma.1"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"grub2-ppc64le","fixed_in":["1:2.06-70.el9_3.2.alma.1"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"grub2-ppc64le-modules","fixed_in":["1:2.06-70.el9_3.2.alma.1"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"grub2-tools","fixed_in":["1:2.06-70.el9_3.2.alma.1"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"grub2-tools-efi","fixed_in":["1:2.06-70.el9_3.2.alma.1"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"grub2-tools-extra","fixed_in":["1:2.06-70.el9_3.2.alma.1"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"grub2-tools-minimal","fixed_in":["1:2.06-70.el9_3.2.alma.1"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"grub2-common","fixed_in":["1:2.06-61.el9_2.1.alma.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"grub2-efi-aa64-modules","fixed_in":["1:2.06-61.el9_2.1.alma.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"grub2-efi-x64","fixed_in":["1:2.06-61.el9_2.1.alma.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"grub2-efi-x64-cdboot","fixed_in":["1:2.06-61.el9_2.1.alma.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"grub2-efi-x64-modules","fixed_in":["1:2.06-61.el9_2.1.alma.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"grub2-emu","fixed_in":["1:2.06-61.el9_2.1.alma.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"grub2-emu-modules","fixed_in":["1:2.06-61.el9_2.1.alma.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"grub2-pc","fixed_in":["1:2.06-61.el9_2.1.alma.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"grub2-pc-modules","fixed_in":["1:2.06-61.el9_2.1.alma.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"grub2-tools","fixed_in":["1:2.06-61.el9_2.1.alma.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"grub2-tools-efi","fixed_in":["1:2.06-61.el9_2.1.alma.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"grub2-tools-extra","fixed_in":["1:2.06-61.el9_2.1.alma.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"TuxCare:AlmaLinux:9.2","package":"grub2-tools-minimal","fixed_in":["1:2.06-61.el9_2.1.alma.tuxcare.els2"],"sources":["osv"]},{"ecosystem":"Red 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support"},{"vendor":"redhat","product":"enterprise_linux"}],"references":[{"url":"https://access.redhat.com/errata/RHSA-2024:0437","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred","advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2024:0456","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred","advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2024:0468","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred","advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2023-4001","tags":["vdb-entry","x_refsource_REDHAT","x_transferred","Third Party Advisory","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2224951","tags":["issue-tracking","x_refsource_REDHAT","x_transferred","Issue Tracking","Vendor Advisory","report"]},{"url":"https://dfir.ru/2024/01/15/cve-2023-4001-a-vulnerability-in-the-downstream-grub-boot-manager/","tags":["x_transferred","Third Party Advisory","article"]},{"url":"http://www.openwall.com/lists/oss-security/2024/01/15/3","tags":["x_transferred"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3OBADMKHQLJOBA32Q7XPNSYMVHVAFDCB/","tags":["x_transferred"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CHLZQ47HM64NDOHMHYO7VIJFYD5ZPPYN/","tags":["x_transferred"]},{"url":"https://security.netapp.com/advisory/ntap-20240216-0006/","tags":["x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-4001","tags":["advisory"]},{"url":"https://dfir.ru/2024/01/15/cve-2023-4001-a-vulnerability-in-the-downstream-grub-boot-manager"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3OBADMKHQLJOBA32Q7XPNSYMVHVAFDCB"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CHLZQ47HM64NDOHMHYO7VIJFYD5ZPPYN"},{"url":"https://security.netapp.com/advisory/ntap-20240216-0006"},{"url":"https://github.com/advisories/GHSA-rr4v-xrwq-7rhx"},{"url":"https://bugzilla.redhat.com/2224951","tags":["report"]},{"url":"https://errata.almalinux.org/9/ALSA-2024-0468.html","tags":["advisory"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2023-4001","tags":["advisory"]},{"url":"https://errata.tuxcare.com/almalinux9.2-esu/CLSA-2024-1712672279.html","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2024-0095.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=32997","tags":["report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YSJAEGRR3XHMBBBKYOVMII4P34IXEYPE/","tags":["web"]},{"url":"https://access.redhat.com/security/updates/classification/#moderate","tags":["article"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2024/rhsa-2024_0437.json","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-4001","tags":["advisory","report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2024/rhsa-2024_0456.json","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2024/rhsa-2024_0468.json","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2023-4001","tags":["report"]},{"url":"https://www.openwall.com/lists/oss-security/2024/01/15/3","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2023-4001","title":"Grub2: bypass the grub password protection feature","description":"An authentication bypass flaw was found in GRUB due to the way that GRUB uses the UUID of a device to search for the configuration file that contains the password hash for the GRUB password protection feature. An attacker capable of attaching an external drive such as a USB stick containing a file system with a duplicate UUID (the same as in the \"/boot/\" file system) can bypass the GRUB password protection feature on UEFI systems, which enumerate removable drives before non-removable ones. This issue was introduced in a downstream patch in Red Hat's version of grub2 and does not affect the upstream package.","status":"published","published":"2024-01-15T11:10:19.517Z","modified":"2026-11-07T11:32:44.559Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-290"],"updated_at":"2026-11-07T12:33:58.237937Z"}],"euvd":[{"id":"EUVD-2023-53896","description":"An authentication bypass flaw was found in GRUB due to the way that GRUB uses the UUID of a device to search for the configuration file that contains the password hash for the GRUB password protection feature. An attacker capable of attaching an external drive such as a USB stick containing a file system with a duplicate UUID (the same as in the \"/boot/\" file system) can bypass the GRUB password protection feature on UEFI systems, which enumerate removable drives before non-removable ones. This issue was introduced in a downstream patch in Red Hat's version of grub2 and does not affect the upstream package.","status":"published","published":"2024-01-15T11:10:19Z","modified":"2026-11-07T11:32:44Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-07T12:09:17.956424Z"}],"ghsa":[{"id":"GHSA-rr4v-xrwq-7rhx","title":"An authentication bypass flaw was found in GRUB due to the way that GRUB uses the UUID of a...","description":"An authentication bypass flaw was found in GRUB due to the way that GRUB uses the UUID of a device to search for the configuration file that contains the password hash for the GRUB password protection feature. An attacker capable of attaching an external drive such as a USB stick containing a file system with a duplicate UUID (the same as in the \"/boot/\" file system) can bypass the GRUB password protection feature on UEFI systems, which enumerate removable drives before non-removable ones. This issue was introduced in a downstream patch in Red Hat's version of grub2 and does not affect the upstream package.","status":"published","published":"2024-01-15T12:30:20Z","modified":"2024-02-16T15:30:26Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:P/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"medium"}],"cwes":["CWE-290"],"updated_at":"2026-11-02T14:55:37.270786Z"}],"nvd":[{"id":"CVE-2023-4001","description":"An authentication bypass flaw was found in GRUB due to the way that GRUB uses the UUID of a device to search for the configuration file that contains the password hash for the GRUB password protection feature. An attacker capable of attaching an external drive such as a USB stick containing a file system with a duplicate UUID (the same as in the \"/boot/\" file system) can bypass the GRUB password protection feature on UEFI systems, which enumerate removable drives before non-removable ones. This issue was introduced in a downstream patch in Red Hat's version of grub2 and does not affect the upstream package.","status":"published","published":"2024-01-15T11:15:08.27Z","modified":"2026-11-07T12:17:36.143Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium","assessor":"primary"}],"cwes":["CWE-290"],"updated_at":"2026-11-07T14:05:24.982965Z"}],"osv":[{"id":"BELL-CVE-2023-4001","title":"CVE-2023-4001 does not affect BellSoft software","status":"withdrawn","published":"2024-01-11T05:58:31.930848Z","modified":"2026-01-26T09:47:29.172202Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T15:28:17.742221Z"},{"id":"RHSA-2024:0437","title":"Red Hat Security Advisory: grub2 security update","status":"published","published":"2024-09-16T16:51:29Z","modified":"2026-03-18T11:34:24.818421Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T15:53:12.270484Z"},{"id":"RHSA-2024:0456","title":"Red Hat Security Advisory: grub2 security update","status":"published","published":"2024-09-16T16:51:20Z","modified":"2026-03-18T11:34:27.015339Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T15:53:12.270484Z"},{"id":"RHSA-2024:0468","title":"Red Hat Security Advisory: grub2 security update","status":"published","published":"2024-09-16T16:51:11Z","modified":"2026-03-18T11:34:30.669772Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T15:53:12.270484Z"},{"id":"UBUNTU-CVE-2023-4001","description":"An authentication bypass flaw was found in GRUB due to the way that GRUB uses the UUID of a device to search for the configuration file that contains the password hash for the GRUB password protection feature. An attacker capable of attaching an external drive such as a USB stick containing a file system with a duplicate UUID (the same as in the \"/boot/\" file system) can bypass the GRUB password protection feature on UEFI systems, which enumerate removable drives before non-removable ones. This issue was introduced in a downstream patch in Red Hat's version of grub2 and does not affect the upstream package.","status":"published","published":"2024-01-15T11:15:00Z","modified":"2025-09-08T16:55:49Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium"},{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T16:54:22.741943Z"},{"id":"ALSA-2024:0468","title":"Moderate: grub2 security update","description":"The grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and customizable boot loader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices.\n\nSecurity Fix(es):\n\n* grub2: bypass the GRUB password protection feature (CVE-2023-4001)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2024-01-25T00:00:00Z","modified":"2026-10-29T11:31:40.719554336Z","updated_at":"2026-11-02T15:27:52.091404Z"},{"id":"CLSA-2024-1712672279","title":"grub2: Fix of CVE-2023-4001","description":"- Fix CVE-2023-4001: add --root-dev-only flag to force only search root dev (the grub2\n  configuration file /boot/efi/EFI/almalinux/grub.cfg should be removed manually BEFORE\n  grub2 updating)","status":"published","published":"2024-04-09T14:19:08Z","modified":"2026-06-01T00:30:13.182345366Z","updated_at":"2026-11-02T15:43:40.88185Z"},{"id":"MGASA-2024-0095","title":"Updated grub2 packages fix security vulnerabilities","description":"An out-of-bounds write flaw was found in grub2's NTFS filesystem driver.\nThis issue may allow an attacker to present a specially crafted NTFS\nfilesystem image, leading to grub's heap metadata corruption. In some\ncircumstances, the attack may also corrupt the UEFI firmware heap\nmetadata. As a result, arbitrary code execution and secure boot\nprotection bypass may be achieved. (CVE-2023-4692)\nAn out-of-bounds read flaw was found on grub2's NTFS filesystem driver.\nThis issue may allow a physically present attacker to present a\nspecially crafted NTFS file system image to read arbitrary memory\nlocations. A successful attack allows sensitive data cached in memory or\nEFI variable values to be leaked, presenting a high Confidentiality\nrisk. (CVE-2023-4693)\nAn authentication bypass flaw was found in GRUB due to the way that GRUB\nuses the UUID of a device to search for the configuration file that\ncontains the password hash for the GRUB password protection feature. An\nattacker capable of attaching an external drive such as a USB stick\ncontaining a file system with a duplicate UUID (the same as in the\n\"/boot/\" file system) can bypass the GRUB password protection feature on\nUEFI systems, which enumerate removable drives before non-removable\nones. (CVE-2023-4001)\nA flaw was found in the grub2-set-bootflag utility of grub2. After the\nfix of CVE-2019-14865, grub2-set-bootflag will create a temporary file\nwith the new grubenv content and rename it to the original grubenv file.\nIf the program is killed before the rename operation, the temporary file\nwill not be removed and may fill the filesystem when invoked multiple\ntimes, resulting in a filesystem out of free inodes or blocks.\n(CVE-2024-1048)\n","status":"published","published":"2024-03-28T03:52:55Z","modified":"2026-04-16T04:41:31.114323227Z","updated_at":"2026-11-02T15:49:42.684501Z"}]}}