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Vigil@nce - Linux kernel: memory corruption via a MacOS partition

March 2011 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/

SYNTHESIS OF THE VULNERABILITY

An attacker can mount a device with a malicious MacOS partition,
in order to corrupt the kernel memory, which leads to a denial of
service or to code execution.

Severity: 2/4

Creation date: 22/02/2011

IMPACTED PRODUCTS

 Linux kernel

DESCRIPTION OF THE VULNERABILITY

The fs/partitions/mac.c file implements the support of MacOS
partitions. These partitions are automatically read when an
attacker connects/mounts a device formatted with MacOS.

The mac_partition() function reads sectors indicated in the
partition table. However, if the number of blocks is negative or
too high, a read at an invalid memory area or a memory corruption
occurs.

An attacker can therefore mount a device with a malicious MacOS
partition, in order to create a denial of service or to execute
code.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-memory-corruption-via-a-MacOS-partition-10385


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