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When reading a file containing resident data, i.e., the file data is stored in the $DATA attribute within the NTFS file record, not in external clusters, there are no checks that this resident data actually fits the corresponding file record segment. When parsing a specially-crafted file system image, the current NTFS code will read the file data from an arbitrary, attacker-chosen memory offset and of arbitrary, attacker-chosen length. This allows an attacker to display arbitrary chunks of memory, which could contain sensitive information like password hashes or even plain-text, obfuscated passwords from BS EFI variables. This fix implements a check to ensure that resident data is read from the corresponding file record segment only. Fixes: CVE-2023-4693 Reported-by: Maxim Suhanov <dfirblog@gmail.com> Signed-off-by: Maxim Suhanov <dfirblog@gmail.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. See the file MAINTAINERS for information about the GRUB maintainers, etc. If you found a security vulnerability in the GRUB please check the SECURITY file to get more information how to properly report this kind of bugs to the maintainers. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'