VULNERABILITY

Debian: CVE-2025-0685: grub2 -- security update

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Debian: CVE-2025-0685: grub2 -- security update

Severity
6
CVSS
(AV:L/AC:M/Au:M/C:C/I:C/A:C)
Published
03/03/2025
Created
05/16/2025
Added
05/15/2025
Modified
05/22/2025

Description

A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs filesystem module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciouly crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_jfs_lookup_symlink() function will write past the internal buffer length during grub_jfs_read_file(). This issue can be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot protections.

Solution(s)

  • no-fix-debian-deb-package

References

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