update: grub

[dongsupark]

Name: grub
CVEs: CVE-2023-4692, CVE-2023-4693
CVSSs: 7.8, 4.6
Action Needed: update to >= 2.06-r9

Summary:

• CVE-2023-4692: There is an out-of-bounds write in grub-core/fs/ntfs.c. An attacker may leverage this vulnerability by presenting a specially crafted NTFS filesystem image leading to GRUB's heap metadata corruption. Additionally, in some circumstances, the attack may also corrupt the UEFI firmware heap metadata. As a result arbitrary code execution and secure boot protection bypass may be achieved.
• CVE-2023-4693: There is an out-of-bounds read at grub-core/fs/ntfs.c. A physically present attacker may leverage that by presenting a specially crafted NTFS file system image to read arbitrary memory locations. A successful attack may allow sensitive data cached in memory or EFI variables values to be leaked presenting a high confidentiality risk.

refmap.gentoo: https://bugs.gentoo.org/915131