{"id":"USN-6355-1","summary":"grub2-signed, grub2-unsigned, shim, and shim-signed vulnerability","details":"Daniel Axtens discovered that specially crafted images could cause a\nheap-based out-of-bonds write. A local attacker could possibly use\nthis to circumvent secure boot protections. (CVE-2021-3695)\n\nDaniel Axtens discovered that specially crafted images could cause\nout-of-bonds read and write. A local attacker could possibly use this\nto circumvent secure boot protections. (CVE-2021-3696)\n\nDaniel Axtens discovered that specially crafted images could cause\nbuffer underwrite which allows arbitrary data to be written to a heap.\nA local attacker could possibly use this to circumvent secure\nboot protections. (CVE-2021-3697)\n\nIt was discovered that GRUB2 configuration files were created with\nthe wrong permissions. An attacker could possibly use this to leak\nencrypted passwords. (CVE-2021-3981)\n\nDaniel Axtens discovered that specially crafted IP packets could cause\nan integer underflow and write past the end of a buffer. An attacker\ncould possibly use this to circumvent secure boot protections.\n(CVE-2022-28733)\n\nDaniel Axtens discovered that specially crafted HTTP headers can cause\nan out-of-bounds write of a NULL byte. An attacker could possibly use\nthis to corrupt GRUB2's internal data. (CVE-2022-28734)\n\nJulian Andres Klode discovered that GRUB2 shim_lock allowed non-\nkernel files to be loaded. A local attack could possibly use this to\ncircumvent secure boot protections. (CVE-2022-28735)\n\nChris Coulson discovered that executing chainloaders more than once\ncaused a use-after-free vulnerability. A local attack could possibly\nuse this to circumvent secure boot protections. (CVE-2022-28736)\n\nChris Coulson discovered that specially crafted executables could\ncause shim to make out-of-bound writes. A local attack could possibly\nuse this to circumvent secure boot protections. (CVE-2022-28737)\n\nZhang Boyang discovered that specially crafted unicode sequences\ncould lead to an out-of-bounds write to a heap. A local attacker could\npossibly use this to circumvent secure boot protections.\n(CVE-2022-3775)\n","modified":"2026-02-10T04:43:19Z","published":"2023-09-08T21:56:31Z","related":["UBUNTU-CVE-2021-3695","UBUNTU-CVE-2021-3696","UBUNTU-CVE-2021-3697","UBUNTU-CVE-2021-3981","UBUNTU-CVE-2022-28733","UBUNTU-CVE-2022-28734","UBUNTU-CVE-2022-28735","UBUNTU-CVE-2022-28736","UBUNTU-CVE-2022-28737","UBUNTU-CVE-2022-3775"],"upstream":["CVE-2021-3695","CVE-2021-3696","CVE-2021-3697","CVE-2021-3981","CVE-2022-28733","CVE-2022-28734","CVE-2022-28735","CVE-2022-28736","CVE-2022-28737","CVE-2022-3775","UBUNTU-CVE-2021-3695","UBUNTU-CVE-2021-3696","UBUNTU-CVE-2021-3697","UBUNTU-CVE-2021-3981","UBUNTU-CVE-2022-28733","UBUNTU-CVE-2022-28734","UBUNTU-CVE-2022-28735","UBUNTU-CVE-2022-28736","UBUNTU-CVE-2022-28737","UBUNTU-CVE-2022-3775"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6355-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3695"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3696"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3697"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3981"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2022-3775"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2022-28733"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2022-28734"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2022-28735"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2022-28736"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2022-28737"},{"type":"REPORT","url":"https://launchpad.net/bugs/2029518"}],"affected":[{"package":{"name":"grub2-signed","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/grub2-signed@1.187.3~20.04.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.187.3~20.04.1"}]}],"versions":["1.128","1.129","1.130","1.131","1.133","1.134","1.135","1.136","1.137","1.138","1.139","1.140","1.141","1.142","1.142.1","1.142.3","1.142.4","1.142.5","1.142.6","1.142.8","1.142.9","1.142.10","1.142.11","1.167","1.167.2","1.173.2~20.04.1","1.173.4","1.187.2~20.04.2"],"ecosystem_specific":{"binaries":[{"binary_name":"grub-efi-amd64-signed","binary_version":"1.187.3~20.04.1+2.06-2ubuntu14.1"},{"binary_name":"grub-efi-arm64-signed","binary_version":"1.187.3~20.04.1+2.06-2ubuntu14.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6355-1.json","cves_map":{"cves":[{"id":"CVE-2021-3695","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2021-3696","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2021-3697","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2021-3981","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2022-3775","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2022-28733","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2022-28734","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2022-28735","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:H/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-2022-28736","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:H/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-2022-28737","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:20.04:LTS"}}},{"package":{"name":"grub2-unsigned","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/grub2-unsigned@2.06-2ubuntu14.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.06-2ubuntu14.1"}]}],"versions":["2.04-1ubuntu44","2.04-1ubuntu44.2","2.04-1ubuntu47.4","2.04-1ubuntu47.5","2.06-2ubuntu14"],"ecosystem_specific":{"binaries":[{"binary_name":"grub-efi-amd64","binary_version":"2.06-2ubuntu14.1"},{"binary_name":"grub-efi-amd64-bin","binary_version":"2.06-2ubuntu14.1"},{"binary_name":"grub-efi-arm64","binary_version":"2.06-2ubuntu14.1"},{"binary_name":"grub-efi-arm64-bin","binary_version":"2.06-2ubuntu14.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6355-1.json","cves_map":{"cves":[{"id":"CVE-2021-3695","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2021-3696","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2021-3697","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2021-3981","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2022-3775","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2022-28733","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2022-28734","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2022-28735","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:H/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-2022-28736","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:H/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-2022-28737","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:20.04:LTS"}}},{"package":{"name":"shim","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/shim@15.7-0ubuntu1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"15.7-0ubuntu1"}]}],"versions":["15+1533136590.3beb971-0ubuntu1","15+1552672080.a4a1fbe-0ubuntu1","15+1552672080.a4a1fbe-0ubuntu2","15.4-0ubuntu7","15.4-0ubuntu9"],"ecosystem_specific":{"binaries":[{"binary_name":"shim","binary_version":"15.7-0ubuntu1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6355-1.json","cves_map":{"cves":[{"id":"CVE-2021-3695","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2021-3696","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2021-3697","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2021-3981","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2022-3775","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2022-28733","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2022-28734","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2022-28735","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:H/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-2022-28736","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:H/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-2022-28737","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:20.04:LTS"}}},{"package":{"name":"shim-signed","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/shim-signed@1.40.9?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.40.9"}]}],"versions":["1.39","1.40","1.40.3","1.40.4","1.40.6","1.40.7"],"ecosystem_specific":{"binaries":[{"binary_name":"shim-signed","binary_version":"1.40.9+15.7-0ubuntu1"}],"availability":"No subscription 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