Description

util-linux is a random collection of Linux utilities. Before util-linux 2.41.4, `parse_dos_extended()` in `libblkid/src/partitions/dos.c` computes an extended-partition start sector with 32-bit addition and does not apply the extended-area bounds checks to the first two EBR entries. A local attacker who causes a crafted DOS extended-partition disk image or removable medium to be probed can wrap `cur_start + start` to sector zero and cause libblkid to report a false partition overlapping the MBR. This directly compromises the integrity of the reported partition metadata; disk modification or availability loss requires a separate downstream consumer to act on that metadata. This issue is fixed in 2.41.4.

Quick Facts

References

• https://github.com/util-linux/util-linux/commit/05c2dbadf34c…
• https://github.com/util-linux/util-linux/commit/a2d858176b60…
• https://github.com/util-linux/util-linux/commit/e9d544d01326…
• https://github.com/util-linux/util-linux/releases/tag/v2.41.…
• https://github.com/util-linux/util-linux/security/advisories…

External Resources