Security update for grub2 SUSE Patch security@suse.de SUSE Security Team SUSE-SU-2022:4144-1 Final 1 1 2022-11-21T08:29:34Z current 2022-11-21T08:29:34Z 2022-11-21T08:29:34Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z Security update for grub2 This update for grub2 fixes the following issues: Security Fixes: - CVE-2022-2601: Fixed buffer overflow in grub_font_construct_glyph (bsc#1205178). - CVE-2022-3775: Fixed integer underflow in blit_comb() (bsc#1205182). Other: - Bump upstream SBAT generation to 3 The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). SUSE-2022-4144,SUSE-SLE-SERVER-12-SP2-BCL-2022-4144 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/update/announcement/2022/suse-su-20224144-1/ Link for SUSE-SU-2022:4144-1 https://lists.suse.com/pipermail/sle-security-updates/2022-November/013042.html E-Mail link for SUSE-SU-2022:4144-1 https://www.suse.com/support/security/rating/ SUSE Security Ratings https://bugzilla.suse.com/1205178 SUSE Bug 1205178 https://bugzilla.suse.com/1205182 SUSE Bug 1205182 https://www.suse.com/security/cve/CVE-2022-2601/ SUSE CVE CVE-2022-2601 page https://www.suse.com/security/cve/CVE-2022-3775/ SUSE CVE CVE-2022-3775 page SUSE Linux Enterprise Server 12 SP2-BCL grub2-2.02-115.72.1 grub2-arm64-efi-2.02-115.72.1 grub2-branding-upstream-2.02-115.72.1 grub2-i386-efi-2.02-115.72.1 grub2-i386-pc-2.02-115.72.1 grub2-powerpc-ieee1275-2.02-115.72.1 grub2-s390x-emu-2.02-115.72.1 grub2-snapper-plugin-2.02-115.72.1 grub2-systemd-sleep-plugin-2.02-115.72.1 grub2-x86_64-efi-2.02-115.72.1 grub2-x86_64-xen-2.02-115.72.1 grub2-2.02-115.72.1 as a component of SUSE Linux Enterprise Server 12 SP2-BCL grub2-i386-pc-2.02-115.72.1 as a component of SUSE Linux Enterprise Server 12 SP2-BCL grub2-snapper-plugin-2.02-115.72.1 as a component of SUSE Linux Enterprise Server 12 SP2-BCL grub2-systemd-sleep-plugin-2.02-115.72.1 as a component of SUSE Linux Enterprise Server 12 SP2-BCL grub2-x86_64-efi-2.02-115.72.1 as a component of SUSE Linux Enterprise Server 12 SP2-BCL grub2-x86_64-xen-2.02-115.72.1 as a component of SUSE Linux Enterprise Server 12 SP2-BCL A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an overflow when calculating the max_glyph_size value, allocating a smaller than needed buffer for the glyph, this further leads to a buffer overflow and a heap based out-of-bounds write. An attacker may use this vulnerability to circumvent the secure boot mechanism. CVE-2022-2601 SUSE Linux Enterprise Server 12 SP2-BCL:grub2-2.02-115.72.1 SUSE Linux Enterprise Server 12 SP2-BCL:grub2-i386-pc-2.02-115.72.1 SUSE Linux Enterprise Server 12 SP2-BCL:grub2-snapper-plugin-2.02-115.72.1 SUSE Linux Enterprise Server 12 SP2-BCL:grub2-systemd-sleep-plugin-2.02-115.72.1 SUSE Linux Enterprise Server 12 SP2-BCL:grub2-x86_64-efi-2.02-115.72.1 SUSE Linux Enterprise Server 12 SP2-BCL:grub2-x86_64-xen-2.02-115.72.1 moderate To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2022/suse-su-20224144-1/ https://www.suse.com/security/cve/CVE-2022-2601.html CVE-2022-2601 https://bugzilla.suse.com/1205178 SUSE Bug 1205178 When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability issues. Although complex, arbitrary code execution could not be discarded. CVE-2022-3775 SUSE Linux Enterprise Server 12 SP2-BCL:grub2-2.02-115.72.1 SUSE Linux Enterprise Server 12 SP2-BCL:grub2-i386-pc-2.02-115.72.1 SUSE Linux Enterprise Server 12 SP2-BCL:grub2-snapper-plugin-2.02-115.72.1 SUSE Linux Enterprise Server 12 SP2-BCL:grub2-systemd-sleep-plugin-2.02-115.72.1 SUSE Linux Enterprise Server 12 SP2-BCL:grub2-x86_64-efi-2.02-115.72.1 SUSE Linux Enterprise Server 12 SP2-BCL:grub2-x86_64-xen-2.02-115.72.1 moderate To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2022/suse-su-20224144-1/ https://www.suse.com/security/cve/CVE-2022-3775.html CVE-2022-3775 https://bugzilla.suse.com/1205182 SUSE Bug 1205182