{"id":"ALSA-2024:1903","summary":"Important: shim bug fix update","details":"The shim package contains a first-stage UEFI boot loader that handles chaining\nto a trusted full boot loader under secure boot environments.\n\nSecurity Fix(es):\n\n* shim: RCE in http boot support may lead to Secure Boot bypass (CVE-2023-40547)\n* shim: Interger overflow leads to heap buffer overflow in verify_sbat_section\non 32-bits systems (CVE-2023-40548)\n* shim: Out-of-bounds read printing error messages (CVE-2023-40546)\n* shim: Out-of-bounds read in verify_buffer_authenticode() malformed PE file\n(CVE-2023-40549)\n* shim: Out-of-bound read in verify_buffer_sbat() (CVE-2023-40550)\n* shim: out of bounds read when parsing MZ binaries (CVE-2023-40551)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","modified":"2026-01-30T01:09:04.745914Z","published":"2024-04-18T00:00:00Z","related":["CVE-2023-40546","CVE-2023-40547","CVE-2023-40548","CVE-2023-40549","CVE-2023-40550","CVE-2023-40551"],"references":[{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2024:1903"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2023-40546"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2023-40547"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2023-40548"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2023-40549"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2023-40550"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2023-40551"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2234589"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2241782"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2241796"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2241797"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2259915"},{"type":"REPORT","url":"https://bugzilla.redhat.com/2259918"},{"type":"ADVISORY","url":"https://errata.almalinux.org/9/ALSA-2024-1903.html"}],"affected":[{"package":{"name":"shim-aa64","ecosystem":"AlmaLinux:9","purl":"pkg:rpm/almalinux/shim-aa64"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"15.8-4.el9_3.alma.1"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux9/ALSA-2024:1903.json"}},{"package":{"name":"shim-x64","ecosystem":"AlmaLinux:9","purl":"pkg:rpm/almalinux/shim-x64"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"15.8-4.el9_3.alma.1"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux9/ALSA-2024:1903.json"}}],"schema_version":"1.7.3"}