CVE-2020-15707GRUB2 contained integer overflows when handling the initrd command, leading to a heap-based buffer overflow.

Açıklama

Integer overflows were discovered in the functions grub_cmd_initrd and grub_initrd_init in the efilinux component of GRUB2, as shipped in Debian, Red Hat, and Ubuntu (the functionality is not included in GRUB2 upstream), leading to a heap-based buffer overflow. These could be triggered by an extremely large number of arguments to the initrd command on 32-bit architectures, or a crafted filesystem with very large files on any architecture. An attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. This issue affects GRUB2 version 2.04 and prior versions.

Veri: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Bilgiler kaynaktaki haliyle, İngilizce yayımlanır.

Etkilenen ürünler ve sürümler

Kaynaklar ve yamalar

• https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
• https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass vendor-advisory
• http://ubuntu.com/security/notices/USN-4432-1 vendor-advisory
• https://www.debian.org/security/2020-GRUB-UEFI-SecureBoot vendor-advisory
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV200011
• https://access.redhat.com/security/vulnerabilities/grub2bootloader vendor-advisory
• https://www.suse.com/c/suse-addresses-grub2-secure-boot-issue/ vendor-advisory
• https://www.suse.com/support/kb/doc/?id=000019673 vendor-advisory
• https://www.openwall.com/lists/oss-security/2020/07/29/3
• https://lists.gnu.org/archive/html/grub-devel/2020-07/msg00034.html
• DSA-4735 vendor-advisory
• [oss-security] 20200729 multiple secure boot grub2 and linux kernel vulnerabilities mailing-list
• https://security.netapp.com/advisory/ntap-20200731-0008/
• USN-4432-1 vendor-advisory
• openSUSE-SU-2020:1169 vendor-advisory
• openSUSE-SU-2020:1168 vendor-advisory
• GLSA-202104-05 vendor-advisory