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Bug 915131 (CVE-2023-4692, CVE-2023-4693)

Summary: <sys-boot/grub-2.06-r9: Multiple vulnerabilities
Product: Gentoo Security Reporter: Sam James <sam>
Component: VulnerabilitiesAssignee: Gentoo Security <security>
Status: IN_PROGRESS ---    
Severity: normal CC: base-system, floppym
Priority: Normal    
Version: unspecified   
Hardware: All   
OS: Linux   
Whiteboard: B3 [glsa?]
Package list:
Runtime testing required: ---
Bug Depends on: 915187    
Bug Blocks:    

Description Sam James archtester Gentoo Infrastructure gentoo-dev Security 2023-10-03 19:07:08 UTC

We may want to just grab the fixes off Debian as they've backported it all the way back.
Comment 1 Sam James archtester Gentoo Infrastructure gentoo-dev Security 2023-10-03 19:08:07 UTC
CVE-2023-4692 grub2: OOB write when parsing the $ATTRIBUTE_LIST attribute for the $MFT file

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.

Reported-by: Maxim Suhanov


CVE-2023-4693 grub2: OOB read when reading data from the resident $DATA attribute

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.

Reported-by: Maxim Suhanov
Comment 2 Larry the Git Cow gentoo-dev 2023-10-04 19:27:30 UTC
The bug has been referenced in the following commit(s):

commit 1dc4028278f21f9a4abaa9ad2bb99e53b4bf46b6
Author:     Mike Gilbert <>
AuthorDate: 2023-10-04 19:25:25 +0000
Commit:     Mike Gilbert <>
CommitDate: 2023-10-04 19:27:04 +0000

    sys-boot/grub: security backports
    Signed-off-by: Mike Gilbert <>

 sys-boot/grub/Manifest            |   1 +
 sys-boot/grub/grub-2.06-r9.ebuild | 346 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 347 insertions(+)