{"id":"UBUNTU-CVE-2015-8370","details":"Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication, obtain sensitive information, or cause a denial of service (disk corruption) via backspace characters in the (1) grub_username_get function in grub-core/normal/auth.c or the (2) grub_password_get function in lib/crypto.c, which trigger an \"Off-by-two\" or \"Out of bounds overwrite\" memory error.","modified":"2026-02-04T04:06:15.438201Z","published":"2015-12-11T00:00:00Z","related":["USN-2836-1"],"upstream":["CVE-2015-8370"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2015-8370"},{"type":"REPORT","url":"https://twitter.com/lostinsecurity/status/674925944524640257"},{"type":"REPORT","url":"http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-2836-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2015-8370"}],"affected":[{"package":{"name":"grub2","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/grub2@2.02~beta2-9ubuntu1.6?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.02~beta2-9ubuntu1.6"}]}],"versions":["2.00-19ubuntu2","2.00-19ubuntu3","2.00-19ubuntu4","2.00-20","2.00-21","2.00-22","2.02~beta2-5","2.02~beta2-6","2.02~beta2-7","2.02~beta2-8","2.02~beta2-9","2.02~beta2-9ubuntu1","2.02~beta2-9ubuntu1.1","2.02~beta2-9ubuntu1.2","2.02~beta2-9ubuntu1.3","2.02~beta2-9ubuntu1.4","2.02~beta2-9ubuntu1.5"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"grub-common","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub-coreboot","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub-coreboot-bin","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub-efi","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub-efi-amd64","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub-efi-amd64-bin","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_version":"2.02~beta2-9ubuntu1.6","binary_name":"grub-efi-arm"},{"binary_name":"grub-efi-arm-bin","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub-efi-arm64","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub-efi-arm64-bin","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_version":"2.02~beta2-9ubuntu1.6","binary_name":"grub-efi-ia32"},{"binary_name":"grub-efi-ia32-bin","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub-emu","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub-firmware-qemu","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub-ieee1275","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub-ieee1275-bin","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub-linuxbios","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub-pc","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub-pc-bin","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_version":"2.02~beta2-9ubuntu1.6","binary_name":"grub-rescue-pc"},{"binary_name":"grub-theme-starfield","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub-uboot","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub-uboot-bin","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_version":"2.02~beta2-9ubuntu1.6","binary_name":"grub-xen"},{"binary_name":"grub-xen-bin","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub2","binary_version":"2.02~beta2-9ubuntu1.6"},{"binary_name":"grub2-common","binary_version":"2.02~beta2-9ubuntu1.6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2015/UBUNTU-CVE-2015-8370.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}